Filed Pursuant to Rule 433
                                                    Registration No.: 333-118843

                       [BANC OF AMERICA SECURITIES LOGO]

- --------------------------------------------------------------------------------

      The asset-backed securities referred to in these materials, and the asset
pools backing them, are subject to modification or revision (including the
possibility that one or more classes of securities may be split, combined or
eliminated at any time prior to issuance or availability of a final prospectus)
and are offered on a "when, as and if issued" basis. You understand that, when
you are considering the purchase of these securities, a contract of sale will
come into being no sooner than the date on which the relevant class has been
priced and we have confirmed the allocation of securities to be made to you; any
"indications of interest" expressed by you, and any "soft circles" generated by
us, will not create binding contractual obligations for you or us.

      Because the asset-backed securities are being offered on a "when, as and
if issued" basis, any such contract will terminate, by its terms, without any
further obligation or liability between us, if the securities themselves, or the
particular class to which the contract relates, are not issued. Because the
asset-backed securities are subject to modification or revision, any such
contract also is conditioned upon the understanding that no material change will
occur with respect to the relevant class of securities prior to the closing
date. If a material change does occur with respect to such class, our contract
will terminate, by its terms, without any further obligation or liability
between us (the "Automatic Termination"). If an Automatic Termination occurs, we
will provide you with revised offering materials reflecting the material change
and give you an opportunity to purchase such class. To indicate your interest in
purchasing the class, you must communicate to us your desire to do so within
such timeframe as may be designated in connection with your receipt of the
revised offering materials.

MBS New Issue Term Sheet

Banc of America Mortgage 2005-12 Trust

Mortgage Pass-Through Certificates, Series 2005-12
$298,847,554 (approximate)

Banc of America Mortgage Securities, Inc.

Depositor

Bank of America, National Association

Seller and Servicer

[BANK OF AMERICA LOGO]

December 21, 2005

- --------------------------------------------------------------------------------

The issuer has filed a registration statement (including a prospectus) with the
SEC for the offering to which this communication relates. Before you invest, you
should read the prospectus in that registration statement and other documents
the issuer has filed with the SEC for more complete information about the issuer
and this offering. You may get these documents for free by visiting EDGAR on the
SEC Web site at www.sec.gov. Alternatively, the issuer, any underwriter or any
dealer participating in the offering will arrange to send you the prospectus if
you request it by calling toll-free 1-800-294-1322 or you e-mail a request to
dg.prospectus_distribution@bofasecurities.com. The securities may not be
suitable for all investors. Banc of America Securities LLC and its affiliates
may acquire, hold or sell positions in these securities, or in related
derivatives, and may have an investment or commercial banking relationship with
the issuer.

The information contained in these materials may be based on assumptions
regarding market conditions and other matters as reflected herein. Banc of
America Securities LLC (the "Underwriter") makes no representation regarding the
reasonableness of such assumptions or the likelihood that any such assumptions
will coincide with actual market conditions or events, and these materials
should not be relied upon for such purposes. The Underwriter and its affiliates,
officers, directors, partners and employees, including persons involved in the
preparation or issuance of these materials, may, from time to time, have long or
short positions in, and buy and sell, the securities mentioned herein or
derivatives thereof (including options). Information in these materials is
current as of the date appearing on the material only. Information in these
materials regarding any securities discussed herein supersedes all prior
information regarding such securities. These materials are not to be construed
as an offer to sell or the solicitation of any offer to buy any security in any
jurisdiction where such an offer or solicitation would be illegal.

- --------------------------------------------------------------------------------



                             IRS CIRCULAR 230 NOTICE

THIS FREE WRITING PROSPECTUS IS NOT INTENDED OR WRITTEN TO BE USED, AND CANNOT
BE USED, FOR THE PURPOSE OF AVOIDING U.S. FEDERAL, STATE OR LOCAL TAX PENALTIES.
THIS FREE WRITING PROSPECTUS IS WRITTEN AND PROVIDED BY THE UNDERWRITER IN
CONNECTION WITH THE PROMOTION OR MARKETING OF THE TRANSACTIONS OR MATTERS
ADDRESSED HEREIN. INVESTORS SHOULD SEEK ADVICE BASED ON THEIR PARTICULAR
CIRCUMSTANCES FROM AN INDEPENDENT TAX ADVISOR.



- --------------------------------------------------------------------------------

[BANC OF AMERICA SECURITIES LOGO]      Banc of America Mortgage Securities, Inc.
                                     Mortgage Pass-Through Certificates, 2005-12
                                              $298,847,554 (approximate)

- --------------------------------------------------------------------------------



                                             Last Scheduled       Pass-
                              WAL (Yrs)      Prin Pmt (Mths)      Through
Class   Class Balance (1)   (Call/Mat) (2)   (Call/Mat) (2)        Rate                     Principal and Interest Type
- -----   -----------------   --------------   ---------------   -------------     --------------------------------------------------
                                                                  
A-1           $20,445,000   11.16/14.21(6)    37-140/37-360             5.75%    Senior, Sequential Pay, Special Retail, Fixed Rate
A-2           $81,828,000     3.86/ 3.86       1-131/1-131                (3)             Senior, Companion, Floating Rate
A-3           $14,232,000     3.86/ 3.86       1-131/1-131                (4)         Senior, Companion, Inverse Floating Rate
A-4          $132,775,000     3.95/ 3.95        1-96/1-96               5.75%         Senior, Planned Amortization, Fixed Rate
A-5            $4,104,000     8.33/ 8.33      96-104/96-104             5.75%         Senior, Planned Amortization, Fixed Rate
A-6              $320,008    11.16/ 14.21     37-140/37-360             None           Senior, Sequential Pay, Principal Only
A-7           $27,032,000     9.64/11.04      61-140/61-360             5.75%            Super Senior, Lockout, Fixed Rate
A-8            $3,003,000    9.64/ 11.04      61-140/61-360             5.75%        Super Senior Support, Lockout, Fixed Rate
A-R                  $100           Information Not Provided Herein                       Senior, Sequential Pay, Residual
A-PO           $7,149,445     5.22/ 5.62       1-140/1-360              None            Senior, Ratio Strip, Principal Only
               $3,526,940
A-IO           (Notional)     5.26/ 5.66       NA-NA/NA-NA              5.75%            Senior, Fixed Rate, Interest Only
B-1            $5,406,000     9.03/10.28       1-140/1-360              5.75%                 Subordinate, Fixed Rate
B-2            $1,652,000    9.03/ 10.28       1-140/1-360              5.75%                 Subordinate, Fixed Rate
B-3              $901,000    9.03/ 10.28       1-140/1-360              5.75%                 Subordinate, Fixed Rate
B-4              $601,000           Information Not Provided Herein                           Subordinate, Fixed Rate
B-5              $451,000           Information Not Provided Herein                           Subordinate, Fixed Rate
B-6              $450,575           Information Not Provided Herein                           Subordinate, Fixed Rate

           Expected          Expected
            Credit            Ratings
Class   Enhancement(5)    (Fitch\Moody's)
- -----   --------------    ---------------
                    
A-1               3.15%       AAA/Aaa
A-2               3.15%       AAA/Aaa
A-3               3.15%       AAA/Aaa
A-4               3.15%       AAA/Aaa
A-5               3.15%       AAA/Aaa
A-6               3.15%       AAA/Aaa
A-7               3.15%       AAA/Aaa
A-8               3.15%       AAA/Aa1
A-R               3.15%      AAA/None
A-PO              3.15%       AAA/Aaa

A-IO              3.15%       AAA/Aaa
B-1               1.35%       AA/None
B-2               0.80%       A/None
B-3               0.50%      BBB/None
B-4               0.30%       BB/None
B-5               0.15%       B/None
B-6               0.00%         NR


(1)   The Certificate sizes are approximate and are subject to a +/- 5%
      variance.

(2)   The Weighted Average Life, Last Scheduled Principal Payment to Call and to
      Maturity for the Certificates are shown to 300% PSA.

(3)   During the initial LIBOR Based Interest Accrual Period, interest will
      accrue on the Class A-2 Certificates at the rate of 5.19% per annum.
      During each LIBOR Based Interest Accrual Period thereafter, interest will
      accrue on the Class A-2 Certificates at a per annum rate equal to (i)
      0.900% plus (ii) the arithmetic mean of the London interbank offered rate
      quotations for one-month U.S. dollar deposits ("LIBOR") determined monthly
      by the Trustee, subject to a minimum rate of 0.900% and a maximum rate of
      6.750%.

(4)   During the initial LIBOR Based Interest Accrual Period, interest will
      accrue on the Class A-3 Certificates at the rate of 8.96976393% % per
      annum. During each LIBOR Based Interest Accrual Period thereafter interest
      will accrue on the Class A-3 Certificates at a per annum rate equal to (i)
      33.63545531% minus (ii) the product of 5.74957841 and LIBOR determined
      monthly as set forth in this Prospectus Supplement, subject to a minimum
      rate of 0.00% and a maximum rate of 33.63545531%.

(5)   The credit enhancement sizes are preliminary and subject to change based
      upon the final pool as of the Cut-off Date and any additional rating
      agency analysis.

(6)   The weighted average life of the class of Special Retail Certificates
      applies to such class as a whole. Because of the special procedures for
      allocating principal distributions to holders within the class of Special
      Retail Certificates, the weighted average life of an individual
      certificate may vary from the weighted average life of the class as a
      whole.

- --------------------------------------------------------------------------------
                          Preliminary Summary of Terms
- --------------------------------------------------------------------------------

Transaction:                            Banc of America Mortgage 2005-12 Trust

                                        Mortgage Pass-Through Certificates,
                                        Series 2005-12

Depositor:                              Banc of America Mortgage Securities,
                                        Inc.

Underwriter:                            Banc of America Securities LLC

Seller and Servicer:                    Bank of America, National Association

Trustee:                                Wells Fargo Bank, National Association

Insurer of the Special Retail
Certificates:                           Assured Guaranty Corp.

Rating Agencies:                        Moody's Investors Service, Inc. and
                                        Fitch Ratings

Offered Size:                           $298,847,554

Expected Closing Date:                  December 29, 2005

Expected Investor Closing Date:         December 30, 2005

Distribution Date:                      25th of each month, or the next
                                        succeeding business day
                                        (First Distribution Date: January 25,
                                        2006)

Cut-off Date:                           December 1, 2005.

Determination Date:                     For any Distribution Date, the 16th day
                                        of the month in which the Distribution
                                        Date occurs or, if that day is not a
                                        business day, the immediately preceding
                                        business day

Record Date:                            For any Distribution Date, the close of
                                        business on the last business day of the
                                        month preceding the month of that
                                        Distribution Date.

Senior Certificates:                    Class A-1, A-2, A-3, A-4, A-5, A-6, A-7,
                                        A-8, A-PO, A-IO and A-R Certificates.
                                        The Class A-R Certificate is not offered
                                        hereunder.

Subordinate Certificates or
Class B Certificates:                   Class B-1, B-2, B-3, B-4, B-5 and B-6.
                                        The Class B-4, B-5 and B-6 Certificates
                                        are not offered hereunder.

Offered Certificates:                   Class A-1, A-2, A-3, A-4, A-5, A-6, A-7,
                                        A-8, A-PO, A-IO, B-1, B-2 and B-3
                                        Certificates.

Floating Rate Certificates:             Class A-2

Inverse Floating Rate
Certificates:                           Class A-3

Interest Only Certificates:             Class A-IO

Principal Only Certificates:            Class A-6 and Class A-PO

Lockout Certificates:                   Class A-7 and Class A-8

PAC Certificates:                       Class A-4 and Class A-5

Companion Certificates:                 Class A-2 and Class A-3

Super Senior Certificates:              Class A-7

Super Senior Support Certificates:      Class A-8

Special Retail Certificates:            Class A-1

Residual Certificate:                   Class A-R

Day Count:                              30/360

Pricing Speed:                          300% PSA. "PSA" or the Prepayment
                                        Standard Assumption represents an
                                        assumed rate of principal prepayment
                                        each month relative to the
                                        then-outstanding principal balance of a
                                        pool of mortgage loans for the life of
                                        such mortgage loans. A prepayment
                                        assumption of 100% PSA assumes constant
                                        prepayment rates of 0.2% per annum of
                                        the then-outstanding principal balance
                                        of such mortgage loans in the first
                                        month of the life of the mortgage loans
                                        and an additional 0.2% per annum in each
                                        month thereafter until the thirtieth
                                        month. Beginning in the thirtieth month
                                        and in each month thereafter during the
                                        life of the mortgage loans, 100% PSA
                                        assumes a constant prepayment rate of 6%
                                        per annum each month.

Clearing:                               DTC, Clearstream and Euroclear.



                                  Original Certificate      Minimum       Incremental
Denominations:                            Form           Denominations   Denominations
                                                                
A-2, A-3, A-4, A-5, A-7 and A-8        Book Entry               $1,000              $1
Special Retail Certificates            Book Entry               $1,000          $1,000
Principal Only Certificates            Book Entry              $25,000              $1
Interest Only Certificates             Book Entry           $1,000,000              $1
Subordinate Certificates               Book Entry              $25,000              $1


SMMEA Eligibility:                      The Senior Certificates and the Class
                                        B-1 Certificates are expected to
                                        constitute "mortgage related securities"
                                        for purposes of SMMEA.

ERISA Eligibility:                      A fiduciary or other person acting on
                                        behalf of any employee benefit plan or
                                        arrangement, including an individual
                                        retirement account, subject to the
                                        Employee Retirement Income Security Act
                                        of 1974, as amended ("ERISA"), the Code
                                        or any federal, state or local law
                                        ("Similar Law") which is similar to
                                        ERISA or the Code (collectively, a
                                        "Plan") should carefully review with its
                                        legal advisors whether the purchase or
                                        holding of an Offered Certificate could
                                        give rise to a transaction prohibited or
                                        not otherwise permissible under ERISA,
                                        the Code or Similar Law.

                                        The U.S. Department of Labor has
                                        extended to Banc of America Securities
                                        LLC an administrative exemption (the
                                        "Exemption") from certain of the
                                        prohibited transaction rules of ERISA
                                        and the related excise tax provisions of
                                        Section 4975 of the Code with respect to
                                        the initial purchase, the holding and
                                        the subsequent resale by certain Plans
                                        of certificates in pass-through trusts
                                        that consist of certain receivables,
                                        loans and other obligations that meet
                                        the conditions and requirements of the
                                        Exemption.

                                        The Exemption may cover the acquisition
                                        and holding of the Offered Certificates
                                        by the Plans to which it applies
                                        provided that all conditions of the
                                        Exemption other than those within the
                                        control of the investors are met. In
                                        addition, as of the date hereof, there
                                        is no single mortgagor that is the
                                        obligor on 5% of the initial balance of
                                        the Mortgage Pool.

                                        Prospective Plan investors should
                                        consult with their legal advisors
                                        concerning the impact of ERISA, the Code
                                        and Similar Law, the applicability of
                                        PTE 83-1 and the Exemption, and the
                                        potential consequences in their specific
                                        circumstances, prior to making an
                                        investment in the Offered Certificates.
                                        Moreover, each Plan fiduciary should
                                        determine whether under the governing
                                        plan instruments and the applicable
                                        fiduciary standards of investment
                                        prudence and diversification, an
                                        investment in the Offered Certificates
                                        is appropriate for the Plan, taking into
                                        account the overall investment policy of
                                        the Plan and the composition of the
                                        Plan's investment portfolio.

Tax Structure:                          For federal income tax purposes, an
                                        election will be made to treat the Trust
                                        as a "real estate mortgage investment
                                        conduit" (a "REMIC"). The Offered
                                        Certificates (other than the Class A-R
                                        Certificate) will constitute "regular
                                        interests" in the REMIC and will be
                                        treated as debt instruments for federal
                                        income tax purposes. The Class A-R
                                        Certificate constitutes the sole class
                                        of "residual interest" in the REMIC.

Optional Termination Date:              On any Distribution Date on which the
                                        aggregate Stated Principal Balance of
                                        the Mortgage Loans is less than 10% of
                                        the initial aggregate unpaid principal
                                        balance of the Mortgage Loans as of the
                                        Cut-off Date, the Servicer may, at its
                                        option, subject to certain conditions,
                                        purchase the Mortgage Loans, which would
                                        effect an early retirement of the
                                        Certificates.

Reserve Fund and Policy for
the Class A-1 Certificates:

                                        The Class A-1 Certificates are entitled
                                        to the benefit of a reserve fund as
                                        protection against certain interest
                                        shortfalls arising from the timing of
                                        principal payments on the Mortgage Loans
                                        up to $10,000.

                                        The Class A-1 Certificates also will be
                                        entitled to the benefit of an
                                        irrevocable financial guaranty insurance
                                        policy to be issued by Assured Guaranty
                                        Corp. ("Assured Guaranty").

                                              Under the policy, Assured Guaranty
                                        will unconditionally and irrevocably
                                        guarantee:

                                              o     the current payment of
                                                    interest allocated to the
                                                    Class A-1 Certificates,
                                                    other than interest
                                                    shortfalls arising from the
                                                    timing of principal payments
                                                    on the Mortgage Loans and
                                                    interest shortfalls
                                                    attributable to the
                                                    Servicemembers Civil Relief
                                                    Act or comparable state
                                                    legislation; and

                                              o     the payment of any losses of
                                                    principal allocated to the
                                                    Class A-1 Certificates.

The Pooling Agreement:                  The Certificates will be issued pursuant
                                        to a Pooling and Servicing Agreement
                                        (the "Pooling Agreement") to be dated
                                        the Closing Date, among the Depositor,
                                        the Servicer and the Trustee.

The Mortgage Pool:                      The "Mortgage Pool" will consist of
                                        fixed rate, conventional,
                                        fully-amortizing mortgage loans (the
                                        "Mortgage Loans,") secured by first
                                        liens on one- to four-family properties.
                                        All of the Mortgage Loans were
                                        originated or acquired by Bank of
                                        America, National Association, which is
                                        an affiliate of the Depositor and Banc
                                        of America Securities LLC.

Compensating Interest:                  Pursuant to the Pooling Agreement, the
                                        aggregate Servicing Fee payable to the
                                        Servicer for any month will be reduced
                                        (but not below zero) by an amount equal
                                        to the lesser of (i) the Prepayment
                                        Interest Shortfall for such Distribution
                                        Date and (ii) one-twelfth of 0.25% of
                                        the aggregate Stated Principal Balance
                                        of the Mortgage Loans as of the due date
                                        in the month preceding the month of such
                                        Distribution Date (such amount, the
                                        "Compensating Interest"). The
                                        "Prepayment Interest Shortfall" is equal
                                        to the difference between (x) 30 days'
                                        interest at the mortgage interest rate
                                        (less the Servicing Fee Rate) on the
                                        amount of each prepayment on the
                                        Mortgage Loans minus (y) the amount of
                                        interest actually paid by the related
                                        mortgagors on the amount of such
                                        prepayments during the preceding month.

Advances:                               Subject to the certain limitations, the
                                        Servicer will be required pursuant to
                                        the Pooling Agreement to advance (any
                                        such advance, an "Advance") prior to
                                        each remittance date an amount equal to
                                        the aggregate of payments of principal
                                        and interest (net of the Servicing Fee)
                                        which were due on the related due date
                                        on the Mortgage Loans and which were
                                        delinquent on the related Determination
                                        Date. Advances made by the Servicer will
                                        be made from its own funds or funds
                                        available for future distribution. The
                                        obligation to make an Advance with
                                        respect to any Mortgage Loan will
                                        continue until the ultimate disposition
                                        of the REO Property or Mortgaged
                                        Property relating to such Mortgage Loan.
                                        An "REO Property" is a Mortgaged
                                        Property that has been acquired by the
                                        Trust through foreclosure or grant of a
                                        deed in lieu of foreclosure.

Class Balance:                          The class balance of a class of
                                        Certificates at any time will equal its
                                        initial class balance less (i) all
                                        distributions of principal made to such
                                        class, and (ii) losses allocated to such
                                        class.

Notional Amount:                        The Notional Amount of the Class A-IO
                                        Certificates will be equal to the
                                        product of (i) the aggregate of the
                                        Stated Principal Balances of the
                                        Mortgage Loans with Net Mortgage
                                        Interest Rate as of the Cut-off Date
                                        greater than or equal to 5.750% as of
                                        the due date in the month preceding the
                                        month of such Distribution Date and (ii)
                                        a fraction, (a) the numerator of which
                                        is equal to the weighted average of the
                                        Net Mortgage Interest Rates of the these
                                        Mortgage Loans (based on the Stated
                                        Principal Balances of these Mortgage
                                        Loans as of the due date in the month
                                        preceding the month of such Distribution
                                        Date) minus 5.750% and (b) the
                                        denominator of which is equal to 5.750%

Net Mortgage Interest Rate:             The "Net Mortgage Interest Rate" of a
                                        Mortgage Loan is the excess of its
                                        mortgage interest rate over the sum of
                                        the servicing fee rate (which is 0.25%)
                                        and the Trustee fee rate (which is
                                        0.0065%)

Reserve Fund:                           A reserve fund will be established on
                                        the Closing Date for the benefit of the
                                        Class A-1 Certificates (the "Reserve
                                        Fund") by an initial deposit into an
                                        account maintained by the Trustee in the
                                        amount of approximately $10,000. No
                                        additional amounts will be deposited
                                        into the Reserve Fund after the initial
                                        deposit. The Reserve Fund will be
                                        beneficially owned by the Underwriter
                                        and will not be an asset of the REMIC.

                                        A withdrawal will be made on each
                                        Distribution Date from the amount on
                                        deposit in the Reserve Fund, to the
                                        extent available, to cover any
                                        Non-Supported Interest Shortfalls
                                        allocated to the Class A-1 Certificates.
                                        A withdrawal from the Reserve Fund may
                                        only be made, to the extent funds are
                                        available therein, to cover any
                                        Non-Supported Interest Shortfall
                                        allocated to the Class A-1 Certificates
                                        and may not be made to cover any
                                        Non-Supported Interest Shortfall
                                        allocated to any other class. Once the
                                        Reserve Fund has been reduced to zero,
                                        the Policy will not cover any
                                        Non-Supported Interest Shortfalls
                                        allocated to Class A-1 Certificates. A
                                        "Non-Supported Interest Shortfall" is
                                        the amount by which the aggregate of
                                        Prepayment Interest Shortfalls for the
                                        Mortgage Loans during the calendar month
                                        preceding the month of such Distribution
                                        Date exceeds the applicable Compensating
                                        Interest for such period.

                                        The balance of any amount remaining in
                                        the Reserve Fund on the Distribution
                                        Date on which the class balance of a
                                        Class A-1 Certificates is reduced to
                                        zero will be distributed to the
                                        Underwriter.

                                        Neither the Reserve Fund nor the Policy
                                        will cover any Net Interest Shortfalls
                                        arising as a result of a Relief Act
                                        Reduction allocated to the Class A-1
                                        Certificates.

                                        With respect to any Distribution Date,
                                        the "Net Interest Shortfall" is equal to
                                        the sum of (i) the shortfall in interest
                                        received with respect to any Mortgage
                                        Loan as a result of a Relief Act
                                        Reduction and (ii) any Non-Supported
                                        Interest Shortfalls.

                                        A "Relief Act Reduction" is a reduction
                                        in the amount of monthly interest
                                        payment on a Mortgage Loan pursuant to
                                        the Servicemembers Civil Relief Act or
                                        similar state legislation.

Distributions in Reduction of
the Special Retail Certificates:        As to distributions of principal among
                                        holders of the Class A-1 Certificates
                                        (the "Special Retail Certificates"),
                                        Deceased Holders (as defined below) will
                                        be entitled to first priority (up to a
                                        limit of approximately $100,000, as
                                        described below) and beneficial owners
                                        other than Deceased Holders ("Living
                                        Holders") will be entitled to second
                                        priority (up to a limit of approximately
                                        $10,000, as described below). Beneficial
                                        owners of the class of the Special
                                        Retail Certificates will have the right
                                        to request that distributions of
                                        principal be made with respect to their
                                        Special Retail Certificates on each
                                        Distribution Date on which distributions
                                        of principal are made with respect to
                                        that class. All such requested
                                        distributions are subject to the
                                        priorities described below and to the
                                        limitations (i) that they be made only
                                        in lots equal to $1,000 of initial class
                                        balance and (ii) that aggregate
                                        distributions on the class of Special
                                        Retail Certificates on a Distribution
                                        Date will not exceed the portion of the
                                        Senior Principal Distribution Amount
                                        allocated to the Class A-1 Certificates
                                        on that Distribution Date (plus any
                                        amounts available from the Rounding
                                        Account, as described below). To the
                                        extent that amounts available for
                                        distributions of principal on the class
                                        of Special Retail Certificates on any
                                        Distribution Date exceed the aggregate
                                        requests by Deceased Holders and Living
                                        Holders of that class for principal
                                        distributions applicable to that
                                        Distribution Date, those excess amounts
                                        will be distributed to the beneficial
                                        owners of that class by random lot, as
                                        described below.

                                        On each Distribution Date, on which
                                        amounts are available for distribution
                                        of principal on the class of Special
                                        Retail Certificates, the aggregate
                                        amount allocable to those distributions
                                        will be rounded upward, as necessary, to
                                        equal an integral multiple of $1,000,
                                        except as provided below, in accordance
                                        with the priorities and limitations set
                                        forth in this discussion. Rounding will
                                        be accomplished on the first
                                        Distribution Date on which distributions
                                        of principal on the class of Special
                                        Retail Certificates are made, by
                                        withdrawing, from a non-interest bearing
                                        account to be established on the Closing
                                        Date for the Special Retail
                                        Certificates, with a $999.99 deposit by
                                        the Underwriter (the "Rounding
                                        Account"), the amount of funds, if any,
                                        needed to round the amounts otherwise
                                        available for distributions to the
                                        Special Retail Certificates upward to
                                        the next higher integral multiple of
                                        $1,000. On each succeeding Distribution
                                        Date on which distributions of principal
                                        on the class of Special Retail
                                        Certificates are to be made, the amounts
                                        allocable to the class will be applied
                                        first to repay any funds withdrawn from
                                        the Rounding Account on the prior
                                        Distribution Date, and then the
                                        remainder of such allocable amount, if
                                        any, will be similarly rounded upward
                                        through another withdrawal from the
                                        Rounding Account and distributed as
                                        principal on that class. This process
                                        will continue on succeeding Distribution
                                        Dates with respect to the class of
                                        Special Retail Certificates until its
                                        class balance has been reduced to zero.
                                        Thus, the aggregate distribution made in
                                        reduction of the class balance of the
                                        class of Special Retail Certificates on
                                        each Distribution Date may be slightly
                                        more or less than would be the case in
                                        the absence of such rounding procedures,
                                        but such difference will be no more than
                                        $999.99 on that Distribution Date. Under
                                        no circumstances will the sum of all
                                        distributions of principal on the class
                                        of Special Retail Certificates through
                                        any Distribution Date be less than the
                                        sum that would have resulted in the
                                        absence of such rounding procedures.

                                        A beneficial owner of a Special Retail
                                        Certificate who has submitted a request
                                        for a principal distribution may not
                                        receive a distribution at any particular
                                        time after its request, since there can
                                        be no assurance that funds will be
                                        available for making principal
                                        distributions on the class of Special
                                        Retail Certificates on any particular
                                        Distribution Date. Even if funds are
                                        available, those distributions with
                                        respect to the Special Retail
                                        Certificates owned by any particular
                                        beneficial owner may not be made. Also,
                                        due to the procedure for mandatory
                                        distributions described below, there can
                                        be no assurance that on any Distribution
                                        Date on which the funds available for
                                        distribution of principal on the class
                                        of Special Retail Certificates exceed
                                        the aggregate amount of distributions
                                        requested by beneficial owners of the
                                        class, any particular beneficial owner
                                        will not receive a principal
                                        distribution from such excess funds even
                                        if such beneficial owner has not
                                        submitted a request for distribution.
                                        Thus, the timing of distributions of
                                        principal with respect to any particular
                                        Special Retail Certificate is highly
                                        uncertain, and such distributions may be
                                        made earlier or later than the date that
                                        may be desired by a beneficial owner.

                                        Priority of Requested Distributions

                                        Subject to the limitations described
                                        herein, including the order of the
                                        receipt of the request for distributions
                                        as described below under "-- Procedure
                                        for Requesting Distributions,"
                                        beneficial owners of the Special Retail
                                        Certificates have the right to request
                                        that distributions of principal on their
                                        Special Retail Certificates be made. On
                                        each Distribution Date on which
                                        distributions of principal on the class
                                        of Special Retail Certificates are made,
                                        priority of payment on that class will
                                        be given to beneficial owners for whom
                                        principal payment requests are in
                                        effect. For the class of Special Retail
                                        Certificates, DTC will honor requests in
                                        the following order of priority:

                                              First, DTC will honor requests
                                        submitted on behalf of Deceased Holders
                                        in the order of their receipt by DTC,
                                        until those requests have been honored
                                        in an amount up to $100,000 for each
                                        requesting Deceased Holder; and

                                              Second, DTC will honor requests
                                        submitted on behalf of Living Holders in
                                        the order of their receipt by DTC, until
                                        those requests have been honored in an
                                        amount up to $10,000 for each requesting
                                        Living Holder.

                                        Thereafter, DTC will honor requests
                                        submitted on behalf of each Deceased
                                        Holder as provided in step First up to a
                                        second $100,000 and requests submitted
                                        on behalf of each Living Holder as
                                        provided in step Second up to a second
                                        $10,000. This sequence of priorities
                                        will be repeated until all principal
                                        payment requests for the class of
                                        Special Retail Certificates have been
                                        honored to the extent of amounts
                                        available in reduction of that class. In
                                        no event will distributions to the class
                                        of Special Retail Certificates exceed
                                        the amount of principal available for
                                        distribution to such class of Special
                                        Retail Certificates on such Distribution
                                        Date. In no event will the beneficial
                                        owner of a Special Retail Certificate
                                        receive a distribution of principal in
                                        an amount greater than the principal
                                        balance of its Special Retail
                                        Certificate.

                                        If the amount of principal available for
                                        payment on the class of Special Retail
                                        Certificates on a given Distribution
                                        Date is insufficient to honor all
                                        requests with respect to such class,
                                        such requests will be honored on
                                        succeeding Distribution Dates as
                                        principal becomes available. A Special
                                        Retail Certificate principal payment
                                        request submitted on behalf of a Living
                                        Holder who later dies will become
                                        entitled to the priority of a newly
                                        submitted request on behalf of a
                                        Deceased Holder. That priority will be
                                        effective for each subsequent
                                        Distribution Date if DTC has received a
                                        certified copy of the death certificate
                                        and any additional appropriate evidence
                                        of death and any requested tax waivers
                                        by the last business day of the
                                        preceding calendar month.

                                        Procedure for Requesting Distributions

                                        A beneficial owner may request that
                                        distributions of principal on such
                                        beneficial owner's Special Retail
                                        Certificates be made on a Distribution
                                        Date by delivering a written request
                                        therefor to the participant in the DTC
                                        system ("Participants") or to an
                                        organization that holds through a
                                        Participant (an "Indirect Participant")
                                        that maintains such beneficial owner's
                                        account in the Special Retail
                                        Certificates so that the request for
                                        such distribution is received on or
                                        before the Record Date for such
                                        Distribution Date. In the case of a
                                        request on behalf of a Deceased Holder,
                                        a certified copy of the death
                                        certificate and any additional
                                        appropriate evidence of death and any
                                        tax waivers are required to be forwarded
                                        to the Participant under separate cover.
                                        Furthermore, such requests of Deceased
                                        Holders that are incomplete may not be
                                        honored by the Participant and, if not
                                        honored, will lose their priority and
                                        must be rerequested. The Participant
                                        will in turn make the request of DTC
                                        (or, in the case of an Indirect
                                        Participant, such Indirect Participant
                                        must notify the related Participant of
                                        such request, and the Participant will
                                        make the request of DTC) on DTC's
                                        participant terminal system. Upon
                                        receipt of such request, DTC will date
                                        and time stamp such request and forward
                                        such request to the Trustee. DTC may
                                        establish such procedures as it deems
                                        fair and equitable to establish the
                                        order of receipt of requests for such
                                        distributions received by it on the same
                                        day. None of the Depositor, the
                                        Servicer, Assured Guaranty or the
                                        Trustee will be liable for any delay by
                                        DTC, any Participant or any Indirect
                                        Participant in the delivery of requests
                                        for distributions. Requests for
                                        distributions of principal received by
                                        DTC after the Record Date for such
                                        Distribution Date and requests for
                                        distributions of principal received in a
                                        timely manner but not accepted with
                                        respect to a given Distribution Date,
                                        will be treated as requests for
                                        distributions of principal on the next
                                        succeeding Distribution Date and each
                                        succeeding Distribution Date thereafter
                                        until each request is accepted or is
                                        withdrawn as described below. Each
                                        request for distributions of principal
                                        on a Special Retail Certificate
                                        submitted by a beneficial owner of a
                                        Special Retail Certificate will be held
                                        by DTC until such request has been
                                        accepted or has been withdrawn in
                                        writing, in the manner set forth below.
                                        The principal amount covered by such
                                        request will continue to bear interest
                                        at the related pass-through rate through
                                        the last calendar date of the month
                                        preceding the month of the Distribution
                                        Date.

                                        With respect to Special Retail
                                        Certificates for which beneficial owners
                                        have requested distributions on a
                                        particular Distribution Date on which
                                        distributions of principal on the class
                                        of Special Retail Certificates are being
                                        made, DTC will notify the Participants
                                        prior to such Distribution Date whether,
                                        and the extent to which, such requests
                                        for distributions on the Special Retail
                                        Certificates have been accepted.
                                        Participants and Indirect Participants
                                        holding Special Retail Certificates are
                                        required to forward such notices to the
                                        beneficial owners of such Certificates.
                                        Requested distributions on Special
                                        Retail Certificates entitled to such
                                        distributions will be due and payable on
                                        the applicable Distribution Date and
                                        will cease to bear interest after the
                                        last calendar date of the month
                                        preceding the month of such Distribution
                                        Date.

                                        Any beneficial owner of a Special Retail
                                        Certificate that has requested a
                                        distribution may withdraw such request
                                        by so notifying in writing the
                                        Participant or Indirect Participant that
                                        maintains such beneficial owner's
                                        account. The Participant will make the
                                        request of DTC on DTC's participant
                                        terminal system. In the event that such
                                        account is maintained by an Indirect
                                        Participant, such Indirect Participant
                                        must notify the related Participant,
                                        which in turn must make the request of
                                        DTC on DTC's participant terminal
                                        system. If such notice of withdrawal of
                                        a request for distribution has not been
                                        received by the DTC on or before the
                                        Record Date for the Distribution Date,
                                        the previously made request for
                                        distribution will be irrevocable with
                                        respect to the making of distributions
                                        of principal on the class of Special
                                        Retail Certificates on the applicable
                                        Distribution Date.

                                        Mandatory Distributions of Principal on
                                        the Special Retail Certificates

                                        If the amount available for principal
                                        distributions on the class of Special
                                        Retail Certificates on a Distribution
                                        Date exceeds the aggregate amount of
                                        distribution requests for that class
                                        which have been received by DTC on or
                                        before the applicable Record Date,
                                        additional Special Retail Certificates
                                        in lots equal to $1,000 will be selected
                                        to receive principal distributions in
                                        accordance with the then-applicable
                                        established random lot procedures of
                                        DTC, and the procedures of the
                                        Participants and Indirect Participants,
                                        which may or may not be by random lot.
                                        Investors in the Special Retail
                                        Certificates should ask Participants or
                                        Indirect Participants which allocation
                                        procedures they use. Participants and
                                        Indirect Participants holding Special
                                        Retail Certificates selected for
                                        mandatory distributions of principal are
                                        required to provide notice of such
                                        mandatory distributions to the affected
                                        beneficial owners.

                                        Deceased Holders

                                        A "Deceased Holder" is a beneficial
                                        owner of a Special Retail Certificate
                                        who was living at the time such interest
                                        was acquired and whose executor or other
                                        authorized representative causes to be
                                        furnished to the Participant a certified
                                        copy of the death certificate and any
                                        additional evidence of death
                                        satisfactory to the Participant and any
                                        tax waivers requested by the
                                        Participant. Special Retail Certificates
                                        beneficially owned by tenants by the
                                        entirety, joint tenants or tenants in
                                        common will be considered to be
                                        beneficially owned by a single owner.

                                        The death of a tenant by the entirety,
                                        joint tenant or tenant in common will be
                                        deemed to be the death of the beneficial
                                        owner, and the Special Retail
                                        Certificates so owned will be eligible
                                        for priority with respect to
                                        distributions of principal, subject to
                                        the limitations described herein.
                                        Special Retail Certificates beneficially
                                        owned by a trust will be considered to
                                        be beneficially owned by each
                                        beneficiary of the trust to the extent
                                        of such beneficiary's interest therein,
                                        but in no event will a trust's
                                        beneficiaries collectively be deemed to
                                        be beneficial owners of a number of
                                        Special Retail Certificates greater than
                                        the number of Special Retail
                                        Certificates of which the trust is the
                                        owner. The death of the beneficiary of a
                                        trust will be deemed to be the death of
                                        a beneficial owner of the Special Retail
                                        Certificates beneficially owned by the
                                        trust to the extent of that
                                        beneficiary's interest in the trust. The
                                        death of an individual who was a tenant
                                        by the entirety, joint tenant or tenant
                                        in common in a tenancy that is the
                                        beneficiary of a trust will be deemed to
                                        be the death of the beneficiary of the
                                        trust. The death of a person who, during
                                        his or her lifetime, was entitled to
                                        substantially all of the beneficial
                                        ownership interest in a Special Retail
                                        Certificate will be deemed to be the
                                        death of the beneficial owner of the
                                        Special Retail Certificate regardless of
                                        the registration of the ownership, if
                                        the beneficial ownership interest can be
                                        established to the satisfaction of the
                                        Participant. Beneficial interests will
                                        be deemed to exist in typical cases of
                                        street name or nominee ownership,
                                        ownership by a trustee, ownership under
                                        the Uniform Gift to Minors Act and
                                        community property or other joint
                                        ownership arrangements between a husband
                                        and wife. Beneficial interests shall
                                        include the power to sell, transfer, or
                                        otherwise dispose of a Special Retail
                                        Certificate and the right to receive the
                                        proceeds therefrom, as well as interest
                                        payments and distributions in reduction
                                        of principal balance with respect
                                        thereto. As used in this Prospectus
                                        Supplement, a request for a distribution
                                        of principal of a Special Retail
                                        Certificate by a Deceased Holder shall
                                        mean a request by the personal
                                        representative, surviving tenant by the
                                        entirety, surviving joint tenant or
                                        surviving tenant in common of such
                                        Deceased Holder.

                                        Pro Rata Distributions

                                        On each Distribution Date, if Assured
                                        Guaranty fails to pay an Insured Amount
                                        in respect of principal, distributions
                                        of principal on the class of Special
                                        Retail Certificates will be made pro
                                        rata among the holders of such class of
                                        Special Retail Certificates and will not
                                        be rounded up to an integral multiple of
                                        $1,000 or made in integral multiples of
                                        $1,000 nor will distributions be made
                                        pursuant to requested distributions or
                                        mandatory random lot distributions. If
                                        pro rata distributions cannot be made
                                        through the facilities of DTC, the
                                        Special Retail Certificates will be
                                        withdrawn from the facilities of DTC and
                                        Definitive Certificates will be issued
                                        to the beneficial owners of those
                                        Certificates.

The Financial Guaranty
Insurance Policy:                       The following summary of terms of the
                                        financial guaranty insurance policy to
                                        be issued by Assured Guaranty Corp.
                                        ("Assured Guaranty") does not purport to
                                        be complete and is qualified in its
                                        entirety by reference to the Policy
                                        referred to below.

                                        Assured Guaranty has made a commitment,
                                        subject to the satisfaction of certain
                                        conditions, to issue a financial
                                        guaranty insurance policy (the "Policy")
                                        relating to the Banc of America Mortgage
                                        Securities, Inc. Mortgage Pass-Through
                                        Certificates, Series 2005-12, Class A-1
                                        Certificates (the "Insured
                                        Certificates"), effective as of the date
                                        of issuance of the Insured Certificates.
                                        Under the terms of the Policy, Assured
                                        Guaranty will unconditionally and
                                        irrevocably guarantee to pay each and
                                        every Insured Amount (as defined below)
                                        that shall become due for payment but
                                        shall be unpaid by reason of Nonpayment
                                        (as defined below). The Policy is
                                        non-cancelable for any reason.

                                        Principal payable by Assured Guaranty
                                        under the Policy in respect of the
                                        Insured Certificates will in no event
                                        exceed the class balance of the Insured
                                        Certificates as of the date of issuance,
                                        which is expected to be $20,445,000.

                                        Assured Guaranty will pay each Insured
                                        Amount that constitutes a Deficiency
                                        Amount to the Trustee, as beneficiary of
                                        the Policy on behalf of the holders of
                                        the Insured Certificates, on the later
                                        of (i) the Distribution Date on which
                                        such Deficiency Amount becomes due for
                                        payment or (ii) the third business day
                                        following the day on which Assured
                                        Guaranty receives notice of claim
                                        therefor in accordance with the terms of
                                        the Policy. Assured Guaranty will pay
                                        each Insured Amount that constitutes a
                                        Preference Amount when due to be paid by
                                        or on behalf of the holders of the
                                        Insured Certificates pursuant to an
                                        applicable court order, but in any event
                                        no earlier than the fourth business day
                                        following receipt by Assured Guaranty of
                                        the documentation required by Assured
                                        Guaranty in accordance with the terms of
                                        the Policy.

                                        The terms below are summary
                                        descriptions. Reference should be made
                                        to the Policy for the actual definition
                                        of each term defined below.

                                        "Deficiency Amount" means, with respect
                                        to the Insured Certificates and any
                                        Distribution Date, the amount (if any)
                                        equal to (1) the sum of (a) any
                                        shortfall in amounts available in the
                                        certificate account to pay interest for
                                        the related Interest Accrual Period on
                                        the class balance of the Insured
                                        Certificates at the then applicable
                                        pass-through rate for such Distribution
                                        Date and (b) the amount of the principal
                                        portion of any Realized Losses allocated
                                        to the Insured Certificates on such
                                        Distribution Date and (2) on the
                                        Distribution Date in January 2036 or,
                                        with the consent of Assured Guaranty,
                                        upon the earlier of the termination of
                                        the Trust pursuant to the terms of the
                                        Pooling Agreement, the class balance of
                                        the Insured Certificates after giving
                                        effect to any distributions on such
                                        Distribution Date and, in the case of
                                        each of clauses (1) and (2), net of any
                                        Prepayment Interest Shortfalls or Relief
                                        Act Reductions allocated to the Insured
                                        Certificates, or any shortfall
                                        attributable to the liability of the
                                        Trust, the REMIC, the Trustee for
                                        withholding or other taxes, including
                                        interest and penalties in respect of
                                        such liabilities allocated to the
                                        Insured Certificates on such
                                        Distribution Date; provided, however,
                                        that "Deficiency Amount" shall not
                                        include any additional amounts owing by
                                        the Trust as a result of the failure by
                                        the Trustee to pay such amount when due
                                        and payable, including, without
                                        limitation, any such additional amounts
                                        as may be attributable to penalties or
                                        default interest rates, amounts in
                                        respect of indemnification, or any other
                                        additional amounts payable by reason of
                                        such a default.

                                        "Insured Amount" means, with respect to
                                        any Distribution Date, the sum of any
                                        Deficiency Amount for such Distribution
                                        Date and any Preference Amount.

                                        "Insured Payment" means, with respect to
                                        any Distribution Date, the aggregate
                                        amount paid by Assured Guaranty to the
                                        Trustee in respect of (i) the Deficiency
                                        Amount for such Distribution Date and
                                        (ii) Preference Amounts for any given
                                        Business Day.

                                        "Nonpayment" means, with respect to any
                                        Distribution Date, an Insured Amount is
                                        due for payment but the funds, if any,
                                        remitted to the Trustee pursuant to the
                                        Pooling Agreement are insufficient for
                                        payment in full of such Insured Amount.

                                        "Preference Amount" means any payment of
                                        principal or interest previously
                                        distributed by or on behalf of the Trust
                                        to a holder of Insured Certificates,
                                        which would have been covered under the
                                        Policy as a Deficiency Amount if there
                                        had been a shortfall in funds available
                                        to make such a payment on the required
                                        Distribution Date for such payment,
                                        which has been deemed a preferential
                                        transfer and has been recovered from
                                        such holder pursuant to the United
                                        States Bankruptcy Code in accordance
                                        with a final nonappealable order of a
                                        court or other body exercising
                                        jurisdiction in an insolvency proceeding
                                        by or against the Trust.

                                        Assured Guaranty shall be subrogated to
                                        the rights of the holders of the Insured
                                        Certificates to receive distributions in
                                        respect of the Insured Certificates to
                                        the extent of any payment by Assured
                                        Guaranty under the Policy.

                                        The Policy is not covered by the
                                        property/casualty insurance fund
                                        specified in Article 76 of the New York
                                        Insurance Law.

                                        Capitalized terms used in the Policy and
                                        not otherwise defined in the Policy
                                        shall have the meanings set forth in the
                                        Pooling Agreement as of the date of
                                        execution of the Policy, without giving
                                        effect to any subsequent amendment to or
                                        modification of the Pooling Agreement
                                        unless such amendment or modification
                                        has been approved in writing by Assured
                                        Guaranty.

The Certificate Insurer:                Assured Guaranty is a Maryland-domiciled
                                        insurance company regulated by the
                                        Maryland Insurance Administration and
                                        licensed to conduct financial guaranty
                                        insurance business in forty-seven
                                        states, the District of Columbia and
                                        Puerto Rico. Assured Guaranty commenced
                                        operations in 1988. Assured Guaranty is
                                        a wholly owned, indirect subsidiary of
                                        Assured Guaranty Ltd. ("AGL"), a
                                        Bermuda-based holding company whose
                                        shares are publicly held and are listed
                                        on the New York Stock Exchange under the
                                        symbol "AGO." AGL, through its operating
                                        subsidiaries, provides credit
                                        enhancement products to the public
                                        finance, structured finance and mortgage
                                        markets. Neither AGL nor any of its
                                        shareholders is obligated to pay any
                                        debts of Assured Guaranty or any claims
                                        under any insurance policy issued by
                                        Assured Guaranty.

                                        Assured Guaranty is subject to insurance
                                        laws and regulations in Maryland and in
                                        New York (and in other jurisdictions in
                                        which it is licensed) that, among other
                                        things, (i) limit Assured Guaranty's
                                        business to financial guaranty insurance
                                        and related lines, (ii) prescribe
                                        minimum solvency requirements, including
                                        capital and surplus requirements, (iii)
                                        limit classes and concentrations of
                                        investments, (iv) regulate the amount of
                                        both the aggregate and individual risks
                                        that may be insured, (v) limit the
                                        payment of dividends by Assured
                                        Guaranty, (vi) require the maintenance
                                        of contingency reserves and (vii) govern
                                        changes in control and transactions
                                        among affiliates. Certain state laws to
                                        which Assured Guaranty is subject also
                                        require the approval of policy rates and
                                        forms.

                                        Assured Guaranty's financial strength is
                                        rated "AAA" by Standard & Poor's, a
                                        division of The McGraw-Hill Companies,
                                        Inc., "Aa1" by Moody's Investors
                                        Service, Inc. and "AAA" by Fitch Inc.
                                        Each rating of Assured Guaranty should
                                        be evaluated independently. An
                                        explanation of the significance of the
                                        above ratings may be obtained from the
                                        applicable rating agency. The above
                                        ratings are not recommendations to buy,
                                        sell or hold any security, and such
                                        ratings are subject to revision or
                                        withdrawal at any time by the rating
                                        agencies. Any downward revision or
                                        withdrawal of any of the above ratings
                                        may have an adverse effect on the market
                                        price of any security guaranteed by
                                        Assured Guaranty. Assured Guaranty does
                                        not guaranty the market price of the
                                        securities it guarantees, nor does it
                                        guaranty that the ratings on such
                                        securities will not be revised or
                                        withdrawn.

                                        Capitalization of Assured Guaranty Corp.

                                        The following table sets forth the
                                        capitalization of Assured Guaranty as of
                                        December 31, 2003 and December 2004 and
                                        as of September 30, 2005 (unaudited), on
                                        the basis of accounting principles
                                        generally accepted in the United States
                                        of America ("GAAP"):

Capitalization of Assured Guaranty Corp.



                                             December 31, 2003   December 31, 2004   September 30, 2005
                                               (in millions)       (in millions)       (in millions)
                                             -----------------   -----------------   ------------------
                                                                            
Unearned Premiums                                         $389                $369                 $197
Other Liabilities                                          236                 280                  167
Shareholder's Equity:
  Common Stock                                              15                  15                   15
  Additional Paid-in Capital                               351                 386                  363
  Unrealized Gain on Bonds, Net of Tax                      45                  43                   32
  Retained Earnings                                        465                 563                  617
Total Shareholder's Equity                                $876              $1,007               $1,027
                                             -----------------   -----------------   ------------------
Total Liabilities and Shareholder's Equity              $1,501              $1,656               $1,391



                                        The following documents are hereby
                                        incorporated by reference into this Free
                                        Writing Prospectus and shall be deemed
                                        to be a part hereof:

                                        o     The consolidated balance sheets of
                                              Assured Guaranty as of December
                                              31, 2004 and December 31, 2003 and
                                              the related consolidated
                                              statements of operations and
                                              comprehensive income, of
                                              shareholder's equity and of cash
                                              flows for each of the three years
                                              in the period ended December 31,
                                              2004, prepared in accordance with
                                              GAAP, included as Exhibit 99.1 to
                                              the Annual Report on Form 10-K of
                                              AGL for the fiscal year ended
                                              December 31, 2004 (which was filed
                                              with the Securities and Exchange
                                              Commission (the "SEC") on March
                                              22, 2005);

                                        o     The unaudited consolidated balance
                                              sheet and statement of
                                              shareholder's equity of Assured
                                              Guaranty as of and for the period
                                              ended March 31, 2005,
                                              respectively, and the related
                                              consolidated statements of
                                              operations and comprehensive
                                              income and cash flows for the
                                              three months ended March 31, 2005
                                              and March 31, 2004, prepared in
                                              accordance with GAAP, included as
                                              Exhibit 99.1 to the Quarterly
                                              Report on Form 10-Q for the
                                              quarterly period ended March 31,
                                              2005 (which was filed by AGL with
                                              the SEC on May 12, 2005);

                                        o     The unaudited consolidated balance
                                              sheet and statement of
                                              shareholder's equity of Assured
                                              Guaranty as of and for the period
                                              ended June 30, 2005, respectively,
                                              the related consolidated
                                              statements of operations and
                                              comprehensive income for the three
                                              and six months ended June 30, 2005
                                              and June 30, 2004, and the
                                              statements of cash flows for the
                                              six months ended June 30, 2005 and
                                              June 30, 2004, prepared in
                                              accordance with GAAP, included as
                                              Exhibit 99.1 to the Quarterly
                                              Report on Form 10-Q for the
                                              quarterly period ended June 30,
                                              2005 (which was filed by AGL with
                                              the SEC on August 15, 2005);

                                        o     The unaudited consolidated balance
                                              sheet and statement of
                                              shareholder's equity of Assured
                                              Guaranty as of and for the period
                                              ended September 30, 2005,
                                              respectively, the related
                                              consolidated statements of
                                              operations and comprehensive
                                              income for the three and nine
                                              months ended September 30, 2005
                                              and September 30, 2004, and the
                                              statements of cash flows for the
                                              nine months ended September 30,
                                              2005 and September 30, 2004,
                                              prepared in accordance with GAAP,
                                              included as Exhibit 99.1 to the
                                              Quarterly Report on Form 10-Q for
                                              the quarterly period ended
                                              September 30, 2005 (which was
                                              filed by AGL with the SEC on
                                              November 7, 2005); and

                                        o     The Current Reports on Form 8-K
                                              filed by AGL with the SEC on April
                                              12, 2005, April 20, 2005, May 10,
                                              2005, May 18, 2005, June 24, 2005,
                                              August 5, 2005, December 12, 2005
                                              and December 21, 2005 as they
                                              relate to Assured Guaranty.

                                        Any statement contained in a document
                                        incorporated herein by reference or
                                        contained in this Free Writing
                                        Prospectus under the heading "The
                                        Certificate Insurer" shall be modified
                                        or superseded for the purposes of this
                                        Free Writing Prospectus to the extent
                                        that a statement contained herein or in
                                        any subsequently filed document which is
                                        incorporated by reference herein also
                                        modifies or supersedes such statement.
                                        Any statement so modified or superseded
                                        shall not be deemed, except as so
                                        modified or superseded, to constitute a
                                        part of this Free Writing Prospectus.

                                        All consolidated financial statements of
                                        Assured Guaranty included in documents
                                        filed by AGL with the SEC pursuant to
                                        Section 13(a), 13(c), 14 or 15(d) of the
                                        Securities Exchange Act of 1934, as
                                        amended, subsequent to the date of this
                                        Free Writing Prospectus and prior to the
                                        termination of the offering of the
                                        Insured Certificates shall be deemed to
                                        be incorporated by reference into this
                                        Free Writing Prospectus and to be a part
                                        hereof from the respective dates of
                                        filing such consolidated financial
                                        statements.

                                        The Maryland Insurance Administration
                                        recognizes only statutory accounting
                                        practices for determining and reporting
                                        the financial condition and results of
                                        operations of an insurance company, for
                                        determining its solvency under the
                                        Maryland Insurance Code, and for
                                        determining whether its financial
                                        condition warrants the payment of a
                                        dividend to its stockholders. No
                                        consideration is given by the Maryland
                                        Insurance Administration to financial
                                        statements prepared in accordance with
                                        GAAP in making such determinations.

                                        Copies of the consolidated financial
                                        statements of Assured Guaranty
                                        incorporated by reference herein and of
                                        the statutory financial statements filed
                                        by Assured Guaranty with the Maryland
                                        Insurance Administration are available
                                        upon request by contacting Assured
                                        Guaranty at 1325 Avenue of the Americas,
                                        New York, New York 10019 or by calling
                                        Assured Guaranty at (212) 974-0100.

                                        Assured Guaranty makes no representation
                                        regarding the Certificates or the
                                        advisability of investing in the Insured
                                        Certificates. In addition, Assured
                                        Guaranty makes no representation
                                        regarding, nor does it accept any
                                        responsibility for the accuracy or
                                        completeness of this Free Writing
                                        Prospectus or any information or
                                        disclosure contained herein, or omitted
                                        herefrom, other than with respect to the
                                        accuracy of the information regarding
                                        the Policy and Assured Guaranty supplied
                                        by Assured Guaranty and presented under
                                        the headings "The Financial Guaranty
                                        Insurance Policy" and "The Certificate
                                        Insurer" in this Free Writing
                                        Prospectus.

Stated Principal Balance:               The Stated Principal Balance means, as
                                        to any Mortgage Loan and due date, the
                                        unpaid principal balance of such
                                        Mortgage Loan as of such due date, as
                                        specified in the amortization schedule
                                        at the time relating thereto (before any
                                        adjustment to such amortization schedule
                                        by reason of any moratorium or similar
                                        waiver or grace period), after giving
                                        effect to any previous partial principal
                                        prepayments and Liquidation Proceeds
                                        (net of unreimbursed expenses and
                                        unreimbursed Advances) allocable to
                                        principal received and to the payment of
                                        principal due on such due date and
                                        irrespective of any delinquency in
                                        payment by the related mortgagor and
                                        after giving effect to any deficient
                                        valuation by a court in connection with
                                        a bankruptcy .


Pool Principal Balance (Non-PO
Portion):                               The Pool Principal Balance (Non-PO
                                        Portion) for any Distribution Date
                                        equals the sum of the product, for each
                                        Mortgage Loan, of the Non-PO Percentage
                                        of such Mortgage Loan multiplied by its
                                        Stated Principal Balance on the due date
                                        in the month preceding the month of such
                                        Distribution Date.

Pool Principal Balance:                 The Pool Principal Balance with respect
                                        to any Distribution Date equals the
                                        aggregate Stated Principal Balances of
                                        the Mortgage Loans outstanding on the
                                        due date in the month preceding the
                                        month of such Distribution Date.

Non-PO Principal Amount:                The "Non-PO Principal Amount" for any
                                        Distribution Date will equal the sum of
                                        the applicable Non-PO Percentage of:

                                              (a)   all monthly payments of
                                                    principal due on each
                                                    Mortgage Loan on the related
                                                    due date;

                                              (b)   the principal portion of the
                                                    purchase price (net of
                                                    unreimbursed Advances and
                                                    other amounts as to which
                                                    the Servicer is entitled to
                                                    be reimbursed pursuant to
                                                    the Pooling Agreement) of
                                                    each Mortgage Loan that was
                                                    repurchased by the Depositor
                                                    pursuant to the Pooling
                                                    Agreement during the
                                                    calendar month preceding the
                                                    month of that Distribution
                                                    Date;

                                              (c)   amounts received with
                                                    respect to such Distribution
                                                    Date as a substitution
                                                    adjustment amount (net of
                                                    unreimbursed Advances and
                                                    other amounts as to which
                                                    the Servicer is entitled to
                                                    be reimbursed pursuant to
                                                    the Pooling Agreement)
                                                    received during the calendar
                                                    month preceding the month of
                                                    that Distribution Date;

                                              (d)   any Liquidation Proceeds
                                                    (net of unreimbursed
                                                    expenses and unreimbursed
                                                    Advances, if any) allocable
                                                    to recoveries of principal
                                                    of the Mortgage Loans that
                                                    have not yet been liquidated
                                                    received during the calendar
                                                    month preceding the month of
                                                    that Distribution Date;

                                              (e)   with respect to each
                                                    Mortgage Loan that was
                                                    liquidated during the
                                                    calendar month preceding the
                                                    month of that Distribution
                                                    Date, the amount of the
                                                    Liquidation Proceeds (other
                                                    than any profits retained by
                                                    the Servicer in connection
                                                    with the foreclosure and net
                                                    of unreimbursed expenses and
                                                    unreimbursed Advances, if
                                                    any) allocable to principal
                                                    received with respect to
                                                    that Mortgage Loan; and

                                              (f)   all partial and full
                                                    principal prepayments on the
                                                    Mortgage Loans by mortgagors
                                                    received during the calendar
                                                    month preceding the month of
                                                    that Distribution Date.

Senior Principal Distribution Amount:   The Senior Principal Distribution Amount
                                        for any Distribution Date will equal the
                                        sum of (i) the Senior Percentage of the
                                        applicable Non-PO Percentage of all
                                        amounts described in clauses (a) through
                                        (d) of the definition of "Non-PO
                                        Principal Amount" for such Distribution
                                        Date and (ii) the Senior Prepayment
                                        Percentage of the applicable Non-PO
                                        Percentage of all amounts described in
                                        clauses (e) and (f) of the definition of
                                        "Non-PO Principal Amount" for such
                                        Distribution Date subject to certain
                                        reductions due to losses.

Subordinate Principal
Distribution Amount:                    The Subordinate Principal Distribution
                                        Amount for any Distribution Date will
                                        equal the sum of (i) the Subordinate
                                        Percentage for the applicable Non-PO
                                        Percentage of all amounts described in
                                        clauses (a) through (d) of the
                                        definition of "Non-PO Principal Amount"
                                        for such Distribution Date and (ii) the
                                        Subordinate Prepayment Percentage of the
                                        applicable Non-PO Percentage all amounts
                                        described in clauses (e) and (f) of the
                                        definition of "Non-PO Principal Amount"
                                        for such Distribution Date.

Senior Percentage:                      The Senior Percentage on any
                                        Distribution Date will equal (i) the
                                        aggregate class balance of the Senior
                                        Certificates (but not the Class A-PO
                                        Certificates) immediately prior to such
                                        date, divided by (ii) the Pool Principal
                                        Balance (Non-PO Portion) for such date.

Subordinate Percentage:                 The Subordinate Percentage for any
                                        Distribution Date will equal 100% minus
                                        the Senior Percentage for such date.

Non-PO Percentage:                      The "Non-PO Percentage" with respect to
                                        any Mortgage Loan with a Net Mortgage
                                        Interest Rate as of the Cut-off Date
                                        less than 5.750% (each such Mortgage
                                        Loan, a "Discount Mortgage Loan") will
                                        be equal to the Net Mortgage Interest
                                        Rate as of the Cut-off Date divided by
                                        5.750%. The Non-PO Percentage with
                                        respect to any Mortgage Loan with a Net
                                        Mortgage Interest Rate as of the Cut-off
                                        Date equal to or greater than 5.750 will
                                        be 100%. The "PO Percentage" for any
                                        Discount Mortgage Loan will be equal to
                                        100% minus the Non-PO Percentage for
                                        such Mortgage Loan.

Premium Distribution Amount:            On each Distribution Date, from and to
                                        the extent of the Pool Distribution
                                        Amount, Assured Guaranty will be
                                        entitled to receive a premium (the
                                        "Premium Distribution Amount") with
                                        respect to the Class A-1 Certificates.
                                        The Premium Distribution Amount will be
                                        equal to the sum of (i) the product of
                                        one-twelfth of 0.09% and the class
                                        balance of the Class A-1 Certificates
                                        and (ii) the sum of the amounts, if any,
                                        by which the amount described in clause
                                        (i) above on each prior Distribution
                                        Date exceeded the amount actually
                                        distributed in respect of the premium
                                        from the Pool Distribution Amount on
                                        such prior Distribution Dates and not
                                        subsequently distributed. No further
                                        amounts will be payable to Assured
                                        Guaranty once the Class A-1 Certificates
                                        are no longer outstanding.

Priority Amount:                        For any Distribution Date will equal the
                                        lesser of (i) the sum of the class
                                        balances of the Class A-7 and Class A-8
                                        Certificates and (ii) the product of (a)
                                        the Shift Percentage, (b) the Priority
                                        Percentage and (c) the Non-PO Principal
                                        Amount.

Priority Percentage:                    For any Distribution Date will equal (i)
                                        the sum of the class balances of the
                                        Class A-7 and Class A-8 Certificates
                                        divided by (ii) the Pool Principal
                                        Balance (Non-PO Portion) immediately
                                        prior to such date.

Shift Percentage:                       For the following Distribution Dates,
                                        will be as follows:



                                        Distribution Date                       Shift Percentage
                                                                             
                                        January 2006 through December 2010      0%
                                        January 2011 through December 2011      30%
                                        January 2012 through December 2012      40%
                                        January 2013 through December 2013      60%
                                        January 2014 through December 2014      80%
                                        January 2015 and thereafter             100%


Principal Distributions:                The Senior Principal Distribution Amount
                                        will generally be allocated sequentially
                                        as follows:

                                              (i)   To the Class A-R
                                                    Certificate, until its class
                                                    balance has been reduced to
                                                    zero;

                                              (ii)  Concurrently, to the Class
                                                    A-7 and Class A-8
                                                    Certificates, pro rata, up
                                                    to the Priority Amount for
                                                    such Distribution Date,
                                                    until their class balances
                                                    have been reduced to zero;

                                              (iii) On or before December 2008,
                                                    pay sequentially as follows:

                                                    1.    to the Class A-4 and
                                                          Class A-5
                                                          Certificates, in that
                                                          order, up to the PAC
                                                          Principal Amount for
                                                          such Distribution
                                                          Date;

                                                    2.    Concurrently to the
                                                          Class A-2 and Class
                                                          A-3 Certificates, pro
                                                          rata, until their
                                                          class balances have
                                                          been reduced to zero;

                                                    3.    Sequentially to the
                                                          Class A-4 and Class
                                                          A-5 Certificates, in
                                                          that order, until
                                                          their class balances
                                                          have been reduced to
                                                          zero;

                                                    4.    Concurrently to the
                                                          Class A-1 and Class
                                                          A-6 Certificates, pro
                                                          rata, until their
                                                          class balances have
                                                          been reduced to zero;

                                              (iv)  After December 2008, pay
                                                    sequentially as follows:

                                                    1.    $20,765.01
                                                          concurrently to the
                                                          Class A-1 and Class
                                                          A-6 Certificates, pro
                                                          rata, until their
                                                          class balances have
                                                          been reduced to zero;

                                                    2.    Sequentially to the
                                                          Class A-4 and Class
                                                          A-5 Certificates, in
                                                          that order, up to the
                                                          PAC Principal Amount
                                                          for such Distribution
                                                          Date;

                                                    3.    Concurrently to the
                                                          Class A-2 and Class
                                                          A-3 Certificates, pro
                                                          rata, until their
                                                          class balances have
                                                          been reduced to zero;

                                                    4.    Sequentially to the
                                                          Class A-4 and Class
                                                          A-5 Certificates, in
                                                          that order, until
                                                          their class balances
                                                          have been reduced to
                                                          zero;

                                                    5.    Concurrently to the
                                                          Class A-1 and Class
                                                          A-6 Certificates, pro
                                                          rata, until their
                                                          class balances have
                                                          been reduced to zero;

                                              (v)   Concurrently, to the Class
                                                    A-7 and Class A-8
                                                    Certificates, pro rata,
                                                    until their class balances
                                                    have been reduced to zero.

Subordinate Prepayment Percentage:      The Subordinate Prepayment Percentage
                                        for any Distribution Date will equal
                                        100% minus the Senior Prepayment
                                        Percentage for such date.

Senior Prepayment Percentage:           For the following Distribution Dates,
                                        will be as follows:



                                        Distribution Date                    Senior Prepayment Percentage
                                                                       
                                        January 2006 through December 2010   100%;

                                        January 2011 through                 the applicable  Senior Percentage plus, 70% of the
                                        December 2011                        applicable Subordinate Percentage;

                                        January 2012 through                 the applicable  Senior Percentage plus, 60% of the
                                        December 2012                        applicable Subordinate Percentage;

                                        January 2013 through                 the applicable  Senior Percentage plus, 40% of the
                                        December 2013                        applicable Subordinate Percentage;

                                        January 2014 through                 the applicable  Senior Percentage plus, 20% of the
                                        December 2014                        applicable Subordinate Percentage;

                                        January 2015 and thereafter          the applicable Senior Percentage;


                                        provided, however, if on any
                                        Distribution Date the Senior Percentage
                                        exceeds the initial Senior Percentage,
                                        then the Senior Prepayment Percentage
                                        for such Distribution Date will equal
                                        100%.

                                        No decrease in the Senior Prepayment
                                        Percentage will occur if the following
                                        occurs as of any Distribution Date as to
                                        which any such decrease applied : (i)
                                        the outstanding principal balance of all
                                        Mortgage Loans (including, for this
                                        purpose, any Mortgage Loans in
                                        foreclosure, any REO Property and any
                                        Mortgage Loan for which the mortgagor
                                        has filed for bankruptcy after the
                                        Closing Date) delinquent 60 days or more
                                        (averaged over the preceding six-month
                                        period), as a percentage of the
                                        aggregate class balance of the Class B
                                        Certificates, is equal to or greater
                                        than 50%, or (ii) cumulative Realized
                                        Losses with respect to the Mortgage
                                        Loans exceed the percentage of the
                                        aggregate balance of the Class B
                                        Certificates as of the Closing Date (the
                                        "Original Subordinate Principal
                                        Balance") indicated below:



                                                                            % of Original Subordinate
                                        Distribution Date Occurring             Principal Balance
                                        ----------------------------------  -------------------------
                                                                         
                                        January 2011 through December 2011              30%
                                        January 2012 through December 2012              35%
                                        January 2013 through December 2013              40%
                                        January 2014 through December 2014              45%
                                        January 2015 and thereafter                     50%


Allocation of Losses:                   On each Distribution Date, the
                                        applicable PO Percentage of any Realized
                                        Loss on a Discount Mortgage Loan will be
                                        allocated to the Class A-PO
                                        Certificates. Such allocation will be
                                        effected on each Distribution Date by
                                        reducing the class balance of the Class
                                        A-PO Certificates, if and to the extent
                                        that such class balance (after taking
                                        into account the amount of all
                                        distributions to be made on such
                                        Distribution Date) exceeds the related
                                        Adjusted Pool Amount (PO Portion) for
                                        such Distribution Date. The amount of
                                        any such Realized Loss allocated to the
                                        Class A-PO Certificates will be treated
                                        as a "Class PO Deferred Amount." To the
                                        extent funds are available on such
                                        Distribution Date or on any future
                                        Distribution Date from amounts that
                                        would otherwise be allocable to the
                                        Subordinate Principal Distribution
                                        Amount, the Class PO Deferred Amounts
                                        for the Class A-PO Certificates will be
                                        paid on the Class A-PO Certificates
                                        prior to distributions of principal on
                                        the Class B Certificates. Payments of
                                        the Class PO Deferred Amounts will be
                                        made from the principal payable to the
                                        Subordinate Certificates beginning with
                                        the principal payable to the class of
                                        Subordinate Certificates with the
                                        highest numerical class designation. Any
                                        distribution in respect of unpaid Class
                                        PO Deferred Amounts for the Class A-PO
                                        Certificates will not further reduce the
                                        class balance of such Class A-PO
                                        Certificates The Class PO Deferred
                                        Amounts will not bear interest. The
                                        class balance of the class of Class B
                                        Certificates then outstanding with the
                                        highest numerical class designation will
                                        be reduced by the amount of any payments
                                        in respect of Class PO Deferred Amounts
                                        for the Class A-PO Certificates. Any
                                        excess of these Class PO Deferred
                                        Amounts over the class balance of that
                                        class will be allocated to the next most
                                        subordinate class of Class B
                                        Certificates to reduce its class balance
                                        and so on, as necessary. On each
                                        Distribution Date, the applicable Non-PO
                                        Percentage of any Realized Loss will be
                                        allocated first to the Class B
                                        Certificates in the reverse order of
                                        their numerical class designations
                                        (beginning with the class of Class B
                                        Certificates then outstanding with the
                                        highest numerical class designation), in
                                        each case until the class balance of
                                        such class of Certificates has been
                                        reduced to zero, and then to the Senior
                                        Certificates (but not the Class A-PO
                                        Certificates) pro rata based on their
                                        respective class balances. Such
                                        allocation will be effected on each such
                                        Distribution Date by reducing the class
                                        balance of the class of Class B
                                        Certificates then outstanding with the
                                        highest numerical class designation if
                                        and to the extent that the aggregate of
                                        the class balances of all classes of
                                        Senior Certificates (but not the Class
                                        A-PO Certificates) and the Class B
                                        Certificates (after taking into account
                                        the amount of all distributions to be
                                        made on such Distribution Date) exceeds
                                        the Adjusted Pool Amount (Non-PO
                                        Portion) for such Distribution Date.

                                        In general, a "Realized Loss" means, (a)
                                        with respect to a Mortgage Loan that has
                                        been liquidated, the amount by which the
                                        remaining unpaid principal balance of
                                        the Mortgage Loan exceeds the amount of
                                        proceeds from the liquidation applied to
                                        the principal balance of the related
                                        Mortgage Loan and (b) a losses due to
                                        the bankruptcy of the mortgagor.

                                        After the date on which the aggregate
                                        class balance of the Subordinate
                                        Certificates has been reduced to zero,
                                        on each Distribution Date, the aggregate
                                        of the class balances of all classes of
                                        Senior Certificates (but not the Class
                                        A-PO Certificates) then outstanding will
                                        be reduced if and to the extent that
                                        such aggregate balance (after taking
                                        into account the amount of all
                                        distributions to be made on such
                                        Distribution Date) exceeds the Adjusted
                                        Pool Amount (Non-PO Portion) for such
                                        Distribution Date. The amount of any
                                        such reduction will be allocated among
                                        the Senior Certificates (but not the
                                        Class A-PO Certificates) pro rata based
                                        on their respective class balances.
                                        After the senior credit support
                                        depletion date, the class balance of the
                                        Class A-8 Certificates will be reduced
                                        not only by the principal portion of
                                        Realized Losses allocated to such class,
                                        but also by the portion allocated to the
                                        Class A-7 Certificates.

Adjusted Pool Amount:                   The Adjusted Pool Amount will equal the
                                        aggregate unpaid principal balance of
                                        the Mortgage Loans as of the Cut-off
                                        Date minus the sum of (i) all amounts in
                                        respect of principal received in respect
                                        of the Mortgage Loans (including amounts
                                        received as Advances, principal
                                        prepayments and Liquidation Proceeds
                                        (net of unreimbursed expenses and
                                        unreimbursed advances) in respect of
                                        principal) and distributed on the
                                        Certificates on such Distribution Date
                                        and all prior Distribution Dates and
                                        (ii) the principal portion of all
                                        Realized Losses (other than debt service
                                        reductions) incurred on the Mortgage
                                        Loans from the Cut-off Date through the
                                        end of the month preceding such
                                        Distribution Date.

Adjusted Pool Amount (PO Portion)       The Adjusted Pool Amount (PO Portion)
                                        will equal the sum as to each Mortgage
                                        Loan outstanding as of the Cut-off :
                                        Date of the product of (A) the PO
                                        Percentage for such Mortgage Loan and
                                        (B) the principal balance of such
                                        Mortgage Loan as of the Cut-off Date
                                        less the sum of (i) all amounts in
                                        respect of principal received in respect
                                        of such Mortgage Loan (including amounts
                                        received as Advances, principal
                                        prepayments and Liquidation Proceeds
                                        (net of unreimbursed expenses and
                                        unreimbursed advances) in respect of
                                        principal) and distributed on the
                                        Certificates on such Distribution Date
                                        and all prior Distribution Dates and
                                        (ii) the principal portion of any
                                        Realized Loss (other than a debt service
                                        reduction) incurred on such Mortgage
                                        Loan from the Cut-off Date through the
                                        end of the month preceding the month in
                                        which such Distribution Date occurs.

Adjusted Pool Amount (Non-PO Portion):  The Adjusted Pool Amount (Non-PO
                                        Portion) will equal the difference
                                        between the Adjusted Pool Amount and the
                                        Adjusted Pool Amount (PO Portion).

Interest Accrual:                       Interest will accrue on the Certificates
                                        (other than the Class A-2 and Class A-3
                                        Certificates) during each one-month
                                        period ending on the last day of the
                                        month preceding the month in which each
                                        Distribution Date occurs (each, a
                                        "Regular Interest Accrual Period"). The
                                        initial Regular Interest Accrual Period
                                        will be deemed to have commenced on
                                        December 1, 2005. Interest will accrue
                                        on the Class A-2 and Class A-3
                                        Certificates from the previous
                                        Distribution Date, or in the case of the
                                        first Distribution Date, from the
                                        Closing Date, through and including the
                                        day prior to the current Distribution
                                        Date (each, a "LIBOR Based Interest
                                        Accrual Period" and together with the
                                        Regular Interest Accrual Period, an
                                        "Interest Accrual Period").

Planned Amortization
Certificates and Companions:            The balances of the Class A-4 and Class
                                        A-5 Certificates (the "PAC Group") will
                                        be reduced to the applicable balances
                                        indicated in a predetermined
                                        amortization schedule, attached as
                                        AppendixA, for each Distribution Date if
                                        prepayments on the Mortgage Loans occur
                                        at a constant rate between 125% and 350%
                                        PSA. It is highly unlikely, however,
                                        that the underlying Mortgage Loans will
                                        prepay at a constant rate until maturity
                                        or that all the underlying Mortgage
                                        Loans will prepay at the same rate or
                                        that they will have the characteristics
                                        assumed. Therefore, there can be no
                                        assurance that the balances of the PAC
                                        Group after the payment of principal on
                                        any Distribution Date will be equal to
                                        the balances for such Distribution Date
                                        specified in the amortization table
                                        attached as Appendix A.

                                        The weighted average lives of the PAC
                                        Group will vary under different
                                        prepayment scenarios. If principal
                                        prepayments on the underlying mortgage
                                        loans occur at a constant rate that is
                                        slower than the lower PAC band, the
                                        amount available to make principal
                                        payments to the PAC Group may be
                                        insufficient to reduce the PAC Group's
                                        balances to their planned balances for
                                        such Distribution Date. The weighted
                                        average lives of the PAC Certificates
                                        may therefore be extended. If such
                                        principal prepayments on the underlying
                                        Mortgage Loans occur at a constant rate
                                        that is faster than the upper PAC band,
                                        the weighted average lives of the PAC
                                        Certificates may be shortened.

                                        Because all amounts available for
                                        principal payments on any Distribution
                                        Date will be distributed to holders on
                                        such Distribution Date, the ability to
                                        distribute any PAC Principal Amount on
                                        any Distribution Date will not be
                                        enhanced by the averaging of high and
                                        low principal prepayment rates on the
                                        underlying Mortgage Loans over several
                                        Distribution Dates, as might be the case
                                        if any principal payments were held for
                                        future applications and not distributed
                                        monthly.

                                        The extent to which the planned balances
                                        and targeted balances are achieved and
                                        the sensitivity of any PAC Group to
                                        principal prepayments on the underlying
                                        Mortgage Loans will depend in part on
                                        the period of time during which the
                                        class or classes which support the PAC
                                        Group remain outstanding. Any Companion
                                        Certificates will support the PAC Group.
                                        On each Distribution Date, after any PAC
                                        Group has received its PAC Principal
                                        Amount for such Distribution Date, no
                                        further principal payments will be made
                                        to the PAC Group until the class
                                        balances of the class or classes
                                        supporting any PAC Group have been
                                        reduced to zero. This support is
                                        intended to decrease the likelihood that
                                        the balance of the PAC Group will be
                                        reduced below its respective planned
                                        balance or targeted balance on a given
                                        Distribution Date. Once the applicable
                                        class or classes that provide support to
                                        the PAC Group are no longer outstanding,
                                        any PAC Certificates of any PAC Groups
                                        will become more sensitive to the rate
                                        of prepayments on the underlying
                                        Mortgage Loans, as such classes will
                                        receive principal payments that
                                        otherwise would have been distributable
                                        to the class or classes which supported
                                        them.

- --------------------------------------------------------------------------------
                           Preliminary Credit Support
- --------------------------------------------------------------------------------

The Subordinate Certificates provide credit support for the Senior Certificates.
Additional credit enhancement is provided by the allocation of the applicable
Non-PO Percentages of all principal prepayments on the Mortgage Loans to the
Certificates , subject to certain exceptions, for the first five years and the
disproportionately greater allocation of prepayments to the Senior Certificates
over the following four years. The disproportionate allocation of prepayments
will accelerate the amortization of the Senior Certificates relative to the
amortization of the Subordinate Certificates. As a result, the credit support
percentage for the Senior Certificates should be maintained and may be increased
during the first nine years.

                          Subordination of Certificates
                          |                           ^
                          |          Senior           |
                          |  Credit Support [3.15%]   |
                          |                           |
                          |        Class B-1          |
                          |  Credit Support [1.35%]   |
                          |                           |
      Priority of         |        Class B-2          |     Order of
        Payment           |  Credit Support [0.80%]   |       Loss
                          |                           |    Allocation
                          |        Class B-3          |
                          |  Credit Support [0.50%]   |
                          |                           |
                          |        Class B-4          |
                          |  Credit Support [0.30%]   |
                          |                           |
                          |        Class B-5          |
                          |  Credit Support [0.15%]   |
                          |                           |
                          |        Class B-6          |
                          v  Credit Support [0.00%]   |

- --------------------------------------------------------------------------------
                      Preliminary Priority of Distributions
- --------------------------------------------------------------------------------

Distributions will be made on each Distribution Date from the Pool Distribution
Amount in the following order of priority:

                      Preliminary Priority of Distributions

- --------------------------------------------------------------------------------
                 First, to Assured Guaranty to pay its premium;
- --------------------------------------------------------------------------------
                                       |
                                       v
- --------------------------------------------------------------------------------
   Second, to the Senior Certificates entitled to payments of interest to pay
                                   interest;
- --------------------------------------------------------------------------------
                                       |
                                       v
- --------------------------------------------------------------------------------
               Third, to the Senior Certificates to pay principal;
- --------------------------------------------------------------------------------
                                       |
                                       v
- --------------------------------------------------------------------------------
    Fourth, to the Class A-PO Certificates to pay any applicable PO Deferred
    Amounts, but only from amounts that would otherwise be distributable on
      such Distribution Date as principal of the Subordinate Certificates.
- --------------------------------------------------------------------------------
                                       |
                                       v
- --------------------------------------------------------------------------------
 Fifth, sequentially, to each class of Subordinate Certificates to pay Interest
   and Principal in the order of numerical class designations, beginning with
         Class B-1 Certificates, until each class balance is zero; and
- --------------------------------------------------------------------------------
                                       |
                                       v
- --------------------------------------------------------------------------------
     Sixth, to Assured Guaranty, any remaining Pool Distribution Amount, up
      to the aggregate amount of previously unreimbursed Insured Payments;
                                       and
- --------------------------------------------------------------------------------
                                       |
                                       v
- --------------------------------------------------------------------------------
          Seventh, to the residual certificate, any remaining amounts.
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                          Preliminary Summary of Terms
- --------------------------------------------------------------------------------

Pool Distribution Amount:               The "Pool Distribution Amount" with
                                        respect to any Distribution Date will be
                                        determined by reference to amounts
                                        received and expenses incurred in
                                        connection with the Mortgage Loans and
                                        will be equal to the sum of:

                                              (i) all scheduled installments of
                                        interest (net of the related Servicing
                                        Fee) and principal due on the Mortgage
                                        Loans on the due date in the month in
                                        which such Distribution Date occurs and
                                        received prior to the related
                                        Determination Date, together with any
                                        Advances in respect thereof and any
                                        Compensating Interest allocable to the
                                        Mortgage Loans;

                                              (ii) all proceeds of any primary
                                        mortgage guaranty insurance policies and
                                        any other insurance policies with
                                        respect to the Mortgage Loans, to the
                                        extent such proceeds are not applied to
                                        the restoration of the related mortgaged
                                        property or released to the mortgagor in
                                        accordance with the Servicer's normal
                                        servicing procedures and all other cash
                                        amounts received and retained in
                                        connection with the liquidation of
                                        defaulted Mortgage Loans, by foreclosure
                                        or otherwise (collectively, "Liquidation
                                        Proceeds"), during the calendar month
                                        preceding the month of such Distribution
                                        Date (in each case, net of unreimbursed
                                        expenses incurred in connection with a
                                        liquidation or foreclosure and
                                        unreimbursed Advances, if any);

                                              (iii) all partial or full
                                        prepayments received on the Mortgage
                                        Loans during the calendar month
                                        preceding the month of such Distribution
                                        Date; and

                                              (iv) amounts received with respect
                                        to such Distribution Date as a
                                        substitution adjustment amount or
                                        purchase price in respect of any deleted
                                        Mortgage Loan or amounts received in
                                        connection with the optional termination
                                        of the Trust as of such Distribution
                                        Date, reduced by amounts in
                                        reimbursement for Advances previously
                                        made and other amounts as to which the
                                        Servicer is entitled to be reimbursed
                                        pursuant to the Pooling Agreement.

Description of Servicer:                All of the Mortgage Loans will be
                                        serviced by Bank of America, National
                                        Association (in its capacity as
                                        servicer, the "Servicer") in accordance
                                        with the terms of the Pooling Agreement.
                                        The Servicer may perform any of its
                                        obligations under the Pooling Agreement
                                        through one or more subservicers.
                                        Despite the existence of subservicing
                                        arrangements, the Servicer will be
                                        liable for its servicing duties and
                                        obligations under the Pooling Agreement
                                        as if the Servicer alone were servicing
                                        the Mortgage Loans.

                                        Bank of America, National Association is
                                        an indirect wholly-owned subsidiary of
                                        Bank of America Corporation. Bank of
                                        America, National Association is engaged
                                        in a general commercial banking
                                        business, offering a wide range of
                                        commercial, corporate, international,
                                        financial and retail banking services to
                                        corporations, governments and
                                        individuals. Bank of America, National
                                        Association originates and services
                                        residential mortgage loans and performs
                                        subservicing functions for affiliates.

                                        Bank of America, National Association's
                                        headquarters and its executive offices
                                        are located at 101 South Tryon Street,
                                        Charlotte, North Carolina 28255, and the
                                        telephone number is (704) 386-5478. Bank
                                        of America, National Association is
                                        subject to regulation, supervision and
                                        examination by the Office of the
                                        Comptroller of the Currency and has been
                                        approved as a mortgagee and
                                        seller/servicer by the Department of
                                        Housing and Urban Development, the
                                        Veterans Administration, the Government
                                        National Mortgage Association, Fannie
                                        Mae and Freddie Mac.

Underwriting Guidelines of
America, National Association:          Bank of America, National Association
                                        may, as part of its overall evaluation
                                        of a prospective borrower's
                                        creditworthiness, use Credit Scores or a
                                        combination of Credit Scores and
                                        Mortgage Scores. "Credit Scores"
                                        arestatistical credit scores designed to
                                        assess a borrower's creditworthiness and
                                        likelihood to default on a consumer
                                        obligation over a two-year period based
                                        on a borrower's credit history. Credit
                                        Scores were not developed to predict the
                                        likelihood of default on mortgage loans
                                        and, accordingly, may not be indicative
                                        of the ability of a mortgagor to repay
                                        its Mortgage Loan. A "Mortgage Score"
                                        takes into account not only a borrower's
                                        credit history but also uses statistics
                                        to predict how the majority of loans
                                        with common characteristics in a broad
                                        group of the population will perform in
                                        the future. The Mortgage Score used by
                                        Bank of America, National Association
                                        will either have been developed by Bank
                                        of America, National Association or by a
                                        third party and approved by Bank of
                                        America, National Association. Some
                                        mortgage loans originated by Bank of
                                        America, National Association may have
                                        no Credit Score or Mortgage Score or
                                        have a Credit Score that Bank of
                                        America, National Association believes,
                                        as a result of other factors, is not
                                        predictive of a borrower's capacity and
                                        willingness to pay. In those cases, Bank
                                        of America, National Association will
                                        obtain an alternative credit history
                                        that has at least three credit
                                        references, one of which is housing
                                        related. A prospective borrower with (1)
                                        a higher Credit Score or (2) a higher
                                        Credit Score and Mortgage Score, which,
                                        in either event, indicates a more
                                        favorable credit history, is eligible
                                        for one of Bank of America, National
                                        Association's accelerated processing
                                        programs (the "Accelerated Processing
                                        Programs"). Loans in the Accelerated
                                        Processing Programs (which include,
                                        among others, the All-Ready Home and
                                        Rate Reduction Refinance programs
                                        described below) are subject to less
                                        stringent documentation requirements.

                                        Once the credit report and any
                                        applicable employment and deposit
                                        documentation are received, a
                                        determination is made as to whether the
                                        prospective mortgagor has sufficient
                                        monthly income available (i) to meet the
                                        mortgagor's monthly obligations on the
                                        proposed mortgage loan and other
                                        expenses related to the mortgaged
                                        property (such as property taxes and
                                        hazard insurance) and (ii) to meet other
                                        financial obligations and monthly living
                                        expenses.

                                        To determine the adequacy of the
                                        mortgaged property as collateral,
                                        generally an independent appraisal is
                                        made of each mortgaged property
                                        considered for financing. In certain
                                        instances the appraisal may be conducted
                                        by an employee of Bank of America,
                                        National Association or an affiliate.
                                        The evaluation is based on the
                                        appraiser's estimate of value, giving
                                        appropriate weight to both the market
                                        value of comparable housing, as well as
                                        the cost of replacing the mortgaged
                                        property. If the loan is a refinance of
                                        a loan currently serviced by Bank of
                                        America, National Association, or
                                        carries a conforming loan amount, the
                                        collateral valuation of the property may
                                        be established by an automated valuation
                                        or the tax assessed value.

                                        Mortgage loans will generally be covered
                                        by an appropriate standard form American
                                        Land Title Association title insurance
                                        policy, or a substantially similar
                                        policy or form of insurance acceptable
                                        to FNMA or FHLMC, or if the related
                                        mortgaged property is located in a
                                        jurisdiction where such policies are
                                        generally not available, an opinion of
                                        counsel of the type customarily rendered
                                        in such jurisdiction in lieu of title
                                        insurance will be obtained instead.
                                        Notwithstanding the foregoing, certain
                                        mortgage loans that are not purchase
                                        money mortgage loans or that have
                                        principal balances less than certain
                                        specified amounts may not be covered by
                                        title insurance policies, although title
                                        searches are performed in connection
                                        with the origination of such mortgage
                                        loans. The Depositor will represent and
                                        warrant to the Trustee that the
                                        Mortgaged Property related to each
                                        Mortgage Loan (including each Mortgage
                                        Loan for which a title search is
                                        performed in lieu of obtaining a title
                                        insurance policy) is free and clear of
                                        all encumbrances and liens having
                                        priority over the first lien of the
                                        related Mortgage, subject to certain
                                        limited exceptions. However, in the
                                        event that a lien senior to the lien of
                                        the Mortgage related to a Mortgage Loan
                                        for which a title search is performed in
                                        lieu of obtaining a title insurance
                                        policy is found to exist, the sole
                                        recourse of the Trustee will be against
                                        the Depositor for breach of its
                                        representation and warranty. The Trustee
                                        will not have recourse against any title
                                        insurance company or other party.

                                        Certain states where the mortgaged
                                        properties securing the mortgage loans
                                        are located are "anti-deficiency"
                                        states, where, in general, lenders
                                        providing credit on one-to-four family
                                        properties must look solely to the
                                        property for repayment in the event of
                                        foreclosure. Bank of America, National
                                        Association's underwriting guidelines in
                                        all states (including anti-deficiency
                                        states) require that the value of the
                                        mortgaged property being financed
                                        currently supports and is anticipated to
                                        support in the future the outstanding
                                        loan balance and provides sufficient
                                        value to mitigate the effects of adverse
                                        shifts in real estate values, although
                                        there can be no assurance that such
                                        value will support the outstanding loan
                                        balance in the future.

                                        Bank of America, National Association
                                        may provide secondary financing to a
                                        borrower contemporaneously with the
                                        origination of the first mortgage loan
                                        but only if the first mortgage loan does
                                        not have a Loan-to-Value Ratio exceeding
                                        80% and a combined loan-to-value ratio
                                        exceeding 95%. The underwriting
                                        guidelines applied to the first mortgage
                                        loan are based on the combined higher
                                        loan-to-value ratio with the exception
                                        of the requirement of primary mortgage
                                        insurance and loan amount limit.
                                        Secondary financing by a lender other
                                        than Bank of America, National
                                        Association is not prohibited but the
                                        terms of such financing are subject to
                                        review by Bank of America, National
                                        Association and may not be as stringent
                                        as the Bank of America, National
                                        Association's underwriting guidelines
                                        for secondary financing.

                                        Bank of America, National Association
                                        may originate new mortgage loans under
                                        its "All-Ready Home" mortgage refinance
                                        program. Under this program, a borrower
                                        whose mortgage loan is serviced by Bank
                                        of America, National Association may be
                                        eligible for a reduced documentation
                                        refinancing if the borrower's mortgage
                                        loan has had no delinquent payments in
                                        the previous twelve months and the only
                                        change is to the mortgage interest rate
                                        or term of the mortgage loan. In
                                        addition, under its "Rate Reduction
                                        Refinance" program, Bank of America,
                                        National Association may offer to
                                        refinance a mortgage loan to reduce the
                                        mortgage interest rate and/or change the
                                        amortization schedule for a borrower who
                                        has indicated an interest in refinancing
                                        or who has requested payoff information,
                                        through the extension of a replacement
                                        mortgage loan or the modification of the
                                        existing mortgage loan, provided the
                                        borrower has had no delinquent mortgage
                                        loan payments in the previous twelve
                                        months. In such cases, Bank of America,
                                        National Association will not apply any
                                        significant borrower credit or property
                                        underwriting standards. Mortgage Loans
                                        may have been the subject of a
                                        refinancing described above. To the
                                        extent a borrower becomes eligible for
                                        such a refinancing after his or her
                                        Mortgage Loan has been included in a
                                        particular Trust, such Mortgage Loan
                                        could be refinanced resulting in a
                                        prepayment of such Mortgage Loan.

Foreclosure and Delinquency
Experience of Bank of
America, National
Association:                            The following table summarizes the
                                        delinquency and foreclosure experience
                                        on the portfolio of one- to four-family
                                        first mortgage loans originated or
                                        acquired by Bank of America, National
                                        Association or certain of its affiliates
                                        and serviced or subserviced by Bank of
                                        America, National Association or
                                        serviced by Bank of America, National
                                        Association for others, other than (i)
                                        mortgage loans acquired through certain
                                        mergers with previously unaffiliated
                                        entities, (ii) mortgage loans with
                                        respect to which the servicing rights
                                        were acquired by Bank of America,
                                        National Association in bulk and (iii)
                                        certain mortgage loans originated at
                                        bank branches of Bank of America,
                                        National Association.

                                        The portfolio of mortgage loans serviced
                                        by Bank of America, National Association
                                        includes both fixed and adjustable
                                        interest rate mortgage loans, including
                                        "buydown" mortgage loans, loans with
                                        balances conforming to Freddie Mac's and
                                        Fannie Mae's limits as well as jumbo
                                        loans, loans with stated maturities of
                                        10 to 40 years and other types of
                                        mortgage loans having a variety of
                                        payment characteristics, and includes
                                        mortgage loans secured by mortgaged
                                        properties in geographic locations that
                                        may not be representative of the
                                        geographic distribution or concentration
                                        of the mortgaged properties securing the
                                        Mortgage Loans. There can be no
                                        assurance that the delinquency,
                                        foreclosure and loss experience set
                                        forth below will be similar to the
                                        results that may be experienced with
                                        respect to the Mortgage Loans.

                      Bank of America, National Association
            Delinquency and Foreclosure Experience on Mortgage Loans



                                             At September 30, 2005         At December 31, 2004         At December 31, 2003
                                          --------------------------    --------------------------    -------------------------
                                           Number/      Outstanding      Number/      Outstanding      Number/     Outstanding
                                            % of         Principal        % of         Principal        % of        Principal
                                          Mortgage        Amount        Mortgage        Amount        Mortgage       Amount
                                            Loans      (In Millions)      Loans      (In Millions)      Loans     (In Millions)
- ---------------------------------------   ---------    -------------    ---------    -------------    ---------   -------------
                                                                                                
Total Portfolio                           1,356,316       $214,901.0    1,300,762       $194,743.4    1,229,050      $174,777.5
Delinquencies*
  One Installment delinquent                 16,345         $1,927.5       16,251         $1,802.3       20,406        $2,219.3
  Percent Delinquent                            1.2%             0.9%         1.2%             0.9%         1.7%            1.3%
  Two Installments delinquent                 4,186           $445.2        4,224           $428.3        5,399          $549.9
  Percent Delinquent                            0.3%             0.2%         0.3%             0.2%         0.4%            0.3%
  Three or more installments delinquent       4,488           $449.0        4,935           $484.0        6,294          $615.8
  Percent Delinquent                            0.3%             0.2%         0.4%             0.2%         0.5%            0.4%
In Foreclosure                                3,333           $297.2        4,296           $399.2        5,449          $548.2
  Percent in Foreclosure                        0.2%             0.1%         0.3%             0.2%         0.4%            0.3%
Delinquent and in Foreclosure                28,352         $3,118.8       29,706         $3,113.8       37,548        $3,933.2
Percent Delinquent and in Foreclosure**         2.1%             1.5%         2.3%             1.6%         3.1%            2.3%


- ----------

*     A mortgage loan is deemed to have "one installment delinquent" if any
      scheduled payment of principal or interest is delinquent past the end of
      the month in which such payment was due, "two installments delinquent" if
      such delinquency persists past the end of the month following the month in
      which such payment was due, and so forth.

**    The sums of the Percent Delinquent and Percent in Foreclosure set forth in
      this table may not equal the Percent Delinquent and in Foreclosure due to
      rounding.


- --------------------------------------------------------------------------------
                                  Risk Factors
- --------------------------------------------------------------------------------

Subordination of Super Senior
Support and Subordinate Certificates
Increases Risk of Loss:                 Subordinate certificateholders are more
                                        likely to suffer losses as a result of
                                        losses or delinquencies on the Mortgage
                                        Loans than are Class A
                                        certificateholders.

                                        o     The rights of each class of
                                              Subordinate Certificates to
                                              receive distributions of interest
                                              and principal are subordinated to
                                              the rights of the Senior
                                              Certificates and each class of
                                              Subordinate Certificates with a
                                              lower numerical designation. For
                                              example, the Class B-2
                                              Certificates will not receive
                                              principal or interest on a
                                              distribution date until the Class
                                              A Certificates and Class B-1
                                              Certificates have received the
                                              amounts to which they are entitled
                                              on that Distribution Date.

                                        o     Losses that are realized on the
                                              Mortgage Loans will be allocated
                                              first to the Class B-6
                                              Certificates then to the Class B-5
                                              Certificates and so on, in reverse
                                              numerical order of the class
                                              designation, until the outstanding
                                              class balances of such classes
                                              have been reduced to zero.

                                        Super Senior Support certificateholders
                                        should consider the risk that after the
                                        Subordinate Certificates are no longer
                                        outstanding, the principal portion of
                                        losses realized on the Mortgage Loans
                                        that are allocated to the Super Senior
                                        Certificates will be borne by the Super
                                        Senior Support Certificates, rather than
                                        the Super Senior Certificates.

The Rate of Principal Payments on
the Mortgage Loans Will Affect the
Yield on the Offered Certificates:      Because principal payments on the
                                        Mortgage Loans will be distributed
                                        currently on the Senior Certificates and
                                        the Subordinate Certificates, the rate
                                        of distributions of principal and the
                                        yield to maturity on your Certificates
                                        will be directly related to (i) the rate
                                        and timing of payments of principal on
                                        the applicable Mortgage Loans and (ii)
                                        the amount and timing of defaults by
                                        borrowers that result in losses on the
                                        applicable Mortgage Loans. Borrowers are
                                        permitted to prepay their Mortgage
                                        Loans, in whole or in part, at any time.
                                        The principal payments on the Mortgage
                                        Loans may be in the form of scheduled
                                        principal payments or principal
                                        prepayments (for this purpose, the term
                                        "principal prepayment" includes
                                        prepayments and any other recovery of
                                        principal in advance of the scheduled
                                        due date, including repurchases and
                                        liquidations due to default, casualty,
                                        condemnation and the like). Any of these
                                        prepayments will result in distributions
                                        to you of amounts that would otherwise
                                        be distributed over the remaining term
                                        of the Mortgage Loans.

                                        The rate of principal payments on the
                                        Mortgage Loans will be affected by the
                                        following:

                                        o     the amortization schedules of the
                                              Mortgage Loans;

                                        o     the rate of partial prepayments
                                              and full prepayments by borrowers
                                              due to refinancing, job transfer,
                                              changes in property values or
                                              other factors;

                                        o     liquidations of the properties
                                              that secure defaulted Mortgage
                                              Loans;

                                        o     repurchases of Mortgage Loans by
                                              the Depositor as a result of
                                              defective documentation or
                                              breaches of representations or
                                              warranties;

                                        o     the exercise of due-on-sale
                                              clauses by the Servicer in
                                              connection with transfers of
                                              mortgaged properties;

                                        o     the optional repurchase of all the
                                              Mortgage Loans by the Depositor to
                                              effect a termination of the Trust
                                              when the aggregate Stated
                                              Principal Balance of the Mortgage
                                              Loans is less than 10% of the
                                              aggregate unpaid principal balance
                                              of the mortgage loans as of the
                                              cut-off date; and

                                        o     general and targeted solicitations
                                              for refinancing by mortgage
                                              originators (including Bank of
                                              America, National Association).

                                        The rate of principal payments on the
                                        Mortgage Loans will depend greatly on
                                        the level of mortgage interest rates:

                                        o     If prevailing interest rates for
                                              similar mortgage loans fall below
                                              the interest rates on the Mortgage
                                              Loans in the Trust, the rate of
                                              prepayment is likely to increase.

                                        o     Conversely, if prevailing interest
                                              rates for similar mortgage loans
                                              rise above the interest rates on
                                              the Mortgage Loans in the Trust,
                                              the rate of prepayment is likely
                                              to decrease.

                                        If you are purchasing Offered
                                        Certificates at a discount, and
                                        specifically if you are purchasing the
                                        Class A-6 or Class A-PO Certificates,
                                        you should consider the risk that if
                                        principal payments on the applicable
                                        Mortgage Loans or in the case of the
                                        Class A-PO Certificates, the Discount
                                        Mortgage Loans, occur at a rate slower
                                        than you expected, your yield will be
                                        lower than you expected. If you are
                                        purchasing Offered Certificates at a
                                        premium, or are purchasing a Class A-IO
                                        Certificate (which has no class
                                        balance), you should consider the risk
                                        that if principal payments on the
                                        applicable mortgage loans or, in the
                                        case of the Class A-IO Certificates, the
                                        Mortgage Loans with a Net Mortgage
                                        Interest Rate as of the Cut-off Date
                                        greater than or equal to 5.750%, occur
                                        at a rate faster than you expected, your
                                        yield may be lower than you expected. If
                                        you are purchasing Class A-IO
                                        Certificates, you should consider the
                                        risk that a rapid rate of principal
                                        prepayments on the Mortgage Loans with a
                                        Net Mortgage Interest Rate as of the
                                        Cut-off Date greater than or equal to
                                        5.750%, could result in your failure to
                                        recover your initial investment. If you
                                        are purchasing the Class A-3
                                        Certificates, which are Inverse Floating
                                        Rate Certificates, you should consider
                                        the risk that a high rate of LIBOR may
                                        result in a lower yield than you
                                        expected or a negative yield. In
                                        particular, you should consider the risk
                                        that high constant rates of LIBOR or
                                        high constant prepayment rates on the
                                        Mortgage Loans may result in the failure
                                        to recover your initial investment. You
                                        must make your own decisions as to the
                                        appropriate prepayment assumptions to be
                                        used when purchasing Offered
                                        Certificates. The Senior Prepayment
                                        Percentage of all principal prepayments
                                        (excluding for this purpose, partial
                                        liquidations due to default, casualty,
                                        condemnation and the like) initially
                                        will be distributed to the classes of
                                        Senior Certificates that are entitled to
                                        receive principal prepayment
                                        distributions at that time. This may
                                        result in all (or a disproportionately
                                        high percentage) of those principal
                                        prepayments being distributed to the
                                        Senior Certificates and none (or a
                                        disproportionately low percentage) of
                                        those principal prepayments being
                                        distributed to holders of the
                                        Subordinate Certificates during the
                                        periods of time described in the
                                        definition of "Senior Prepayment
                                        Percentage."

                                        The timing of changes in the rate of
                                        prepayments may significantly affect the
                                        actual yield to you, even if the average
                                        rate of principal prepayments is
                                        consistent with your expectations. In
                                        general, the earlier the payment of
                                        principal of the Mortgage Loans, the
                                        greater the effect on your yield to
                                        maturity. As a result, the effect on
                                        your yield of principal prepayments
                                        occurring at a rate higher (or lower)
                                        than the rate you anticipate during the
                                        period immediately following the
                                        issuance of the certificates will not be
                                        offset by a subsequent like reduction
                                        (or increase) in the rate of principal
                                        prepayments.

Delinquencies and Losses on the
Mortgage Loans Will Adversely Affect
Your Yield:                             Delinquencies on the mortgage loans
                                        which are not advanced by or on behalf
                                        of the Servicer (because the Servicer
                                        has determined that these amounts, if
                                        advanced, would be nonrecoverable), will
                                        adversely affect the yield on the Senior
                                        Certificates and the Subordinate
                                        Certificates. The Servicer will
                                        determine that a proposed advance is
                                        nonrecoverable when, in the good faith
                                        exercise of its servicing judgment, it
                                        believes the proposed advance would not
                                        be ultimately recoverable from the
                                        related mortgagor, related liquidation
                                        proceeds, or other recoveries in respect
                                        of the Mortgage Loan. Because of the
                                        priority of distributions, shortfalls
                                        resulting from delinquencies that are
                                        not covered by advances will be borne
                                        first by the Subordinate Certificates
                                        (in reverse numerical order), and then
                                        by the Senior Certificates.

                                        Net interest shortfalls will adversely
                                        affect the yields on the Offered
                                        Certificates. In addition, losses
                                        generally will be borne by the
                                        Subordinate Certificates. As a result,
                                        the yields on the Offered Certificates
                                        will depend on the rate and timing of
                                        realized losses on the Mortgage Loans.

Credits Scores May Not Accurately
Predict the Likelihood of Default:      Bank of America, National Association
                                        generally uses Credit Scores as part of
                                        its underwriting process. The attached
                                        collateral annex shows credit scores for
                                        the mortgagors obtained at the time of
                                        origination of their mortgage loans. A
                                        credit score purports only to be a
                                        measurement of the relative degree of
                                        risk a borrower represents to a lender,
                                        i.e., that a borrower with a higher
                                        score is statistically expected to be
                                        less likely to default in payment than a
                                        borrower with a lower score. In
                                        addition, it should be noted that credit
                                        scores were developed to indicate a
                                        level of default probability over a
                                        two-year period, which does not
                                        correspond to the life of most mortgage
                                        loans. Furthermore, credit scores were
                                        not developed specifically for use in
                                        connection with mortgage loans, but for
                                        consumer loans in general. Therefore,
                                        credit scores do not address particular
                                        mortgage loan characteristics that
                                        influence the probability of repayment
                                        by the borrower. Neither the depositor
                                        nor Bank of America, National
                                        Association makes any representations
                                        any mortgage loan or that a particular
                                        credit score should be relied upon as a
                                        basis for an expectation that a borrower
                                        will repay its mortgage loan according
                                        to its terms.

Geographic Concentration May Increase
Risk of Loss Due to Adverse Economic
Conditions or Natural Disasters:        At various times, certain geographic
                                        regions will experience weaker economic
                                        conditions and housing markets and,
                                        consequently, will experience higher
                                        rates of delinquency and loss on
                                        mortgage loans generally. In addition,
                                        certain states have experienced natural
                                        disasters, including earthquakes, fires,
                                        floods and hurricanes, which may
                                        adversely affect property values.
                                        Although mortgaged properties located in
                                        certain identified flood zones will be
                                        required to be covered, to the maximum
                                        extent available, by flood insurance, no
                                        mortgaged properties will otherwise be
                                        required to be insured against
                                        earthquake damage or any other loss not
                                        covered by standard hazard insurance
                                        policies. Any concentration of mortgaged
                                        properties in a state or region may
                                        present unique risk considerations. See
                                        the tables entitled "Geographic
                                        Distribution of Mortgaged Properties" in
                                        the attached collateral annex for a
                                        listing of the locations and
                                        concentrations of the mortgaged
                                        properties.

                                        Any deterioration in housing prices in a
                                        state or region due to adverse economic
                                        conditions, natural disaster or other
                                        factors, and any deterioration of
                                        economic conditions in a state or region
                                        that adversely affects the ability of
                                        borrowers to make payments on the
                                        mortgage loans, may result in losses on
                                        the Mortgage Loans. Any losses may
                                        adversely affect the yield to maturity
                                        of the Offered Certificates.

Residential Real Estate Values May
Fluctuate and Adversely Affect
Your Investment:                        There can be no assurance that values of
                                        the mortgaged properties have remained
                                        or will remain at their levels on the
                                        dates of origination of the related
                                        Mortgage Loans. The value of any
                                        mortgaged property generally will change
                                        over time from its value on the
                                        appraisal or sales date. If residential
                                        real estate values generally or in a
                                        particular geographic area decline, the
                                        loan-to-value ratios shown in the table
                                        in the accompanying collateral annex
                                        might not be a reliable indicator of the
                                        rates of delinquencies, foreclosures and
                                        losses that could occur on the Mortgage
                                        Loans. If the residential real estate
                                        market should experience an overall
                                        decline in property values large enough
                                        to cause the outstanding balances of the
                                        Mortgage Loans and any secondary
                                        financing on the related mortgaged
                                        properties to equal or exceed the value
                                        of the mortgaged properties,
                                        delinquencies, foreclosures and losses
                                        could be higher than those now generally
                                        experienced in the mortgage lending
                                        industry or in Bank of America, National
                                        Association's prior securitizations
                                        involving the Depositor.

                                        In addition, adverse economic conditions
                                        and other factors (which may or may not
                                        affect real property values) may affect
                                        the mortgagors' timely payment of
                                        scheduled payments of principal and
                                        interest on the Mortgage Loans and,
                                        accordingly, the actual rates of
                                        delinquencies, foreclosures and losses
                                        with respect to any Mortgage Pool. These
                                        other factors could include excessive
                                        building resulting in an oversupply of
                                        housing in a particular area or a
                                        decrease in employment reducing the
                                        demand for housing in an area. To the
                                        extent that credit enhancements do not
                                        cover such losses, your yield may be
                                        adversely impacted.

United States Military Operations May
Increase Risk of Relief Act Shortfalls: As a result of military operations in
                                        Afghanistan and Iraq, the United States
                                        has placed a substantial number of armed
                                        forces reservists and members of the
                                        National Guard on active duty status. It
                                        is possible that the number of
                                        reservists and members of the National
                                        Guard placed on active duty status may
                                        remain at high levels for an extended
                                        time. To the extent that a member of the
                                        military, or a member of the armed
                                        forces reserves or National Guard who is
                                        called to active duty, is a mortgagor of
                                        a mortgage loan in the trust, the
                                        interest rate limitation of the
                                        Servicemembers Civil Relief Act, and any
                                        comparable state law, will apply. This
                                        may result in interest shortfalls on the
                                        Mortgage Loans in the trust, which will
                                        be borne by all classes of interest
                                        bearing Certificates. The Policy will
                                        not cover any such shortfalls allocated
                                        to the Class A-1 Certificates. Neither
                                        Bank of America, National Association
                                        nor the depositor has not taken any
                                        action to determine whether any of the
                                        Mortgage Loans would be affected by
                                        these interest rate limitations.

Distributions of Principal to the
Special Retail Certificates are
Subject to Special Procedures:          Although there can be no assurance as to
                                        the rate at which principal
                                        distributions will be made on any class
                                        of Offered Certificates, the Special
                                        Retail Certificates, in particular, may
                                        be inappropriate investments for you if
                                        you require a distribution of a
                                        particular amount of principal on a
                                        specific date or an otherwise
                                        predictable stream of distributions. If
                                        you own Special Retail Certificates,
                                        funds available for distributions of
                                        principal may not be sufficient to
                                        permit the distributions you request
                                        within any specific period of time after
                                        your request. During periods in which
                                        prevailing interest rates are generally
                                        higher than the pass-through rate for
                                        the class of Special Retail
                                        Certificates, greater numbers of
                                        beneficial owners may request
                                        distributions of principal in respect of
                                        the Special Retail Certificates to take
                                        advantage of higher interest rates.
                                        During such periods there may, however,
                                        be a concurrent reduction in the rate of
                                        prepayments of the Mortgage Loans, thus
                                        limiting the funds available for such
                                        distributions.

                                        In addition, because of the random lot
                                        procedure for distributing principal,
                                        you may receive a principal distribution
                                        on your Special Retail Certificates on a
                                        Distribution Date (even if you have not
                                        requested such a distribution) if the
                                        amount available for distribution in
                                        respect of principal on such
                                        Distribution Date on the class of
                                        Special Retail Certificates exceeds the
                                        aggregate amount requested for
                                        distribution of principal by all holders
                                        of the class of Special Retail
                                        Certificates. It is more likely that
                                        amounts will be distributed by random
                                        lot during the periods of the relatively
                                        low interest rates and, correspondingly,
                                        higher prepayment rates. Under such
                                        circumstances you may have difficulty
                                        reinvesting these principal
                                        distributions at rates as high as the
                                        pass-through rate of your Certificates
                                        or your expected yield.

There is a Risk that Interest Payments
on the Mortgage Loans May Be
Insufficient to Pay Interest on Your
Certificates:                           When a Mortgage Loan is prepaid in full,
                                        the mortgagor is charged interest only
                                        up to the date on which payment is made,
                                        rather than for an entire month. When a
                                        mortgagor makes a partial principal
                                        prepayment on a Mortgage Loan, the
                                        mortgagor is not charged interest on the
                                        prepayment for the month in which the
                                        principal prepayment was received. This
                                        may result in a shortfall in interest
                                        collections available for payment on the
                                        next Distribution Date. The Servicer is
                                        required to cover a portion of the
                                        shortfall in interest collections that
                                        are attributable to prepayments in full
                                        and partial prepayments on the Mortgage
                                        Loans, but in each case only up to the
                                        amount of Compensating Interest for such
                                        Distribution Date. To the extent these
                                        shortfalls are not covered by the amount
                                        of Compensating Interest, they will be
                                        allocated pro rata to the related
                                        classes of interest-bearing
                                        Certificates. The Policy will not cover
                                        any such shortfalls allocated to the
                                        Class A-1 Certificates.

Certificates May Not Be Appropriate
for Individual Investors:               If you are an individual investor who
                                        does not have sufficient resources or
                                        expertise to evaluate the particular
                                        characteristics of the applicable class
                                        of Offered Certificates, the Offered
                                        Certificates may not be an appropriate
                                        investment for you. This may be the case
                                        because, among other things:

                                              o     if you purchase your
                                                    Certificates at a price
                                                    other than par, your yield
                                                    to maturity will be
                                                    sensitive to the uncertain
                                                    rate and timing of principal
                                                    prepayments on the
                                                    applicable Mortgage Loans;

                                              o     the rate of principal
                                                    distributions on, and the
                                                    weighted average lives of,
                                                    the Offered Certificates
                                                    will be sensitive to the
                                                    uncertain rate and timing of
                                                    principal prepayments on the
                                                    applicable Mortgage Loans
                                                    and the priority of
                                                    principal distributions
                                                    among the classes of
                                                    Certificates, and as such,
                                                    the Offered Certificates
                                                    and, in particular, the
                                                    Special Retail Certificates,
                                                    may be inappropriate
                                                    investments for you if you
                                                    require a distribution of a
                                                    particular amount of
                                                    principal on a specific date
                                                    or an otherwise predictable
                                                    stream of distributions;

                                              o     you may not be able to
                                                    reinvest amounts distributed
                                                    in respect of principal on
                                                    your Certificates (which
                                                    distributions, in general,
                                                    are expected to be greater
                                                    during periods of relatively
                                                    low interest rates) at a
                                                    rate at least as high as the
                                                    applicable pass-through rate
                                                    or your expected yield;

                                              o     a secondary market for the
                                                    Offered Certificates may not
                                                    develop or provide you with
                                                    liquidity of investment; and

                                              o     you must pay tax on any
                                                    interest or original issue
                                                    discount in the year it
                                                    accrues, even if the cash is
                                                    paid to you in a different
                                                    year.

Limited Source of Payments --
No Recourse to Depositor,
Seller, Servicer or Trustee:            Proceeds of the Mortgage Loans will be
                                        the sole source of payments on the
                                        Certificates, other than the Class A-1
                                        Certificates, as to which certain
                                        payments may be made from the Reserve
                                        Fund or under the Policy. The
                                        Certificates do not represent an
                                        interest in or obligation of the
                                        Depositor, the Servicer, the Seller, the
                                        Trustee or any of their affiliates.
                                        There are, however, limited obligations
                                        of the Depositor with respect to certain
                                        breaches of representations and
                                        warranties, and limited obligations of
                                        the Servicer with respect to its
                                        servicing obligations.

                                        Neither the Certificates nor the
                                        Mortgage Loans will be guaranteed by or
                                        insured by any governmental agency or
                                        instrumentality, the Depositor, the
                                        Seller, the Servicer, the Trustee or any
                                        of their affiliates. Consequently, if
                                        payments on the Mortgage Loans are
                                        insufficient or otherwise unavailable to
                                        make all payments required on the
                                        Certificates, there will be no recourse
                                        to the Depositor, the Seller, the
                                        Servicer, the Trustee or any of their
                                        affiliates.

Limited Liquidity:                      The Underwriter intends to make a market
                                        for purchase and sale of the Offered
                                        Certificates after their initial
                                        issuance, but the Underwriter has no
                                        obligation to do so. There is no
                                        assurance that such a secondary market
                                        will develop or, if it does develop,
                                        that it will provide you with liquidity
                                        of investment or that it will continue
                                        for the life of the Offered
                                        Certificates. As a result, you may not
                                        be able to sell your Certificates or you
                                        may not be able to sell your
                                        Certificates at a high enough price to
                                        produce your desired return on
                                        investment.

                                        The secondary market for mortgage-backed
                                        securities has experienced periods of
                                        illiquidity and can be expected to do so
                                        in the future. Illiquidity means that
                                        there may not be any purchasers for your
                                        class of Certificates. Although any
                                        class of Certificates may experience
                                        illiquidity, it is more likely that
                                        classes of Certificates that are more
                                        sensitive to prepayment, credit or
                                        interest rate risk (such as the Interest
                                        Only, Super Senior Support, Principal
                                        Only, Inverse Floating Rate or
                                        Subordinated Certificates) will
                                        experience illiquidity.



- --------------------------------------------------------------------------------

[BANC OF AMERICA SECURITIES LOGO]      Banc of America Mortgage Securities, Inc.
                                     Mortgage Pass-Through Certificates, 2005-12
                                              $298,847,554 (approximate)

- --------------------------------------------------------------------------------

                                   Appendix A

                     Principal Balance Schedule
                             PAC Group
- ------------------   --------------------------
Initial Balance....             $136,879,000.00
January 25, 2006...             $136,463,886.13
February 25, 2006..             $135,986,250.18
March 25, 2006.....             $135,446,339.68
April 25, 2006.....             $134,844,342.30
May 25, 2006.......             $134,180,485.83
June 25, 2006......             $133,455,038.15
July 25, 2006......             $132,668,307.10
August 25, 2006....             $131,820,640.28
September 25, 2006.             $130,912,424.96
October 25, 2006...             $129,944,087.72
November 25, 2006..             $128,916,094.26
December 25, 2006..             $127,828,949.06
January 25, 2007...             $126,683,194.95
February 25, 2007..             $125,479,412.80
March 25, 2007.....             $124,218,220.99
April 25, 2007.....             $122,900,274.94
May 25, 2007.......             $121,526,266.60
June 25, 2007......             $120,096,923.86
July 25, 2007......             $118,613,009.93
August 25, 2007....             $117,075,322.69
September 25, 2007.             $115,484,694.01
October 25, 2007...             $113,841,989.00
November 25, 2007..             $112,148,105.27
December 25, 2007..             $110,403,972.11
January 25, 2008...             $108,610,549.68
February 25, 2008..             $106,768,828.09
March 25, 2008.....             $104,879,826.54
April 25, 2008.....             $102,944,592.37
May 25, 2008.......             $100,965,064.60
June 25, 2008......              $98,998,798.32
July 25, 2008......              $97,045,883.11
August 25, 2008....              $95,106,232.36
September 25, 2008.              $93,179,760.04
October 25, 2008...              $91,266,380.66
November 25, 2008..              $89,366,009.33
December 25, 2008..              $87,478,561.66
January 25, 2009...              $85,624,718.87
February 25, 2009..              $83,783,632.67
March 25, 2009.....              $81,955,220.35
April 25, 2009.....              $80,139,399.73
May 25, 2009.......              $78,336,089.15
June 25, 2009......              $76,545,207.52
July 25, 2009......              $74,766,674.25
August 25, 2009....              $73,000,409.28
September 25, 2009.              $71,246,333.09
October 25, 2009...              $69,504,366.66
November 25, 2009..              $67,774,431.49
December 25, 2009..              $66,056,449.61
January 25, 2010...              $64,350,343.54
February 25, 2010..              $62,656,036.32
March 25, 2010.....              $60,973,451.48
April 25, 2010.....              $59,302,513.05
May 25, 2010.......              $57,643,145.58
June 25, 2010......              $55,995,274.08
July 25, 2010......              $54,358,824.07
August 25, 2010....              $52,733,721.57
September 25, 2010.              $51,119,893.04
October 25, 2010...              $49,517,265.47
November 25, 2010..              $47,925,766.30
December 25, 201...              $46,345,323.44
January 25, 2011...              $44,864,602.28
February 25, 2011..              $43,394,625.19
March 25, 2011.....              $41,935,321.83
April 25, 201......              $40,486,622.29
May 25, 2011.......              $39,048,457.13
June 25, 2011......              $37,620,757.37
July 25, 2011......              $36,203,454.47
August 25, 2011....              $34,796,480.36
September 25, 2011.              $33,399,767.40
October 25, 2011...              $32,013,248.42
November 25, 2011..              $30,636,856.66
December 25, 2011..              $29,270,525.83
January 25, 2012...              $27,943,204.79
February 25, 201...              $26,625,668.32
March 25, 2012.....              $25,317,851.80
April 25, 2012.....              $24,019,691.02
May 25, 2012.......              $22,731,122.22
June 25, 2012......              $21,452,082.03
July 25, 2012......              $20,182,507.52
August 25, 2012....              $18,937,853.05
September 25, 2012.              $17,722,944.77
October 25, 2012...              $16,537,150.93
November 25, 2012..              $15,379,852.65
December 25, 2012..              $14,250,443.67
January 25, 2013...              $13,282,645.42
February 25, 2013..              $12,338,725.60
March 25, 2013.....              $11,418,157.58
April 25, 2013.....              $10,520,425.78
May 25, 2013.......               $9,645,025.47
June 25, 2013......               $8,791,462.52
July 25, 2013......               $7,959,253.20
August 25, 2013....               $7,147,923.96
September 25, 2013.               $6,357,011.24
October 25, 2013...               $5,586,061.24
November 25, 2013..               $4,834,629.75
December 25, 2013..               $4,102,281.92
January 25, 2014...               $3,504,166.96
February 25, 2014..               $2,920,871.48
March 25, 2014.....               $2,352,061.26
April 25, 2014.....               $1,797,409.34
May 25, 2014.......               $1,256,595.83
June 25, 2014......                 $729,307.79
July 25, 2014......                 $215,239.05
August 25, 2014....                       $0.00

- --------------------------------------------------------------------------------

The issuer has filed a registration statement (including a prospectus) with the
SEC for the offering to which this communication relates. Before you invest, you
should read the prospectus in that registration statement and other documents
the issuer has filed with the SEC for more complete information about the issuer
and this offering. You may get these documents for free by visiting EDGAR on the
SEC Web site at www.sec.gov. Alternatively, the issuer, any underwriter or any
dealer participating in the offering will arrange to send you the prospectus if
you request it by calling toll-free 1-800-294-1322 or you e-mail a request to
dg.prospectus_distribution@bofasecurities.com. The securities may not be
suitable for all investors. Banc of America Securities LLC and its affiliates
may acquire, hold or sell positions in these securities, or in related
derivatives, and may have an investment or commercial banking relationship with
the issuer.

The information contained in these materials may be based on assumptions
regarding market conditions and other matters as reflected herein. Banc of
America Securities LLC (the "Underwriter") makes no representation regarding the
reasonableness of such assumptions or the likelihood that any such assumptions
will coincide with actual market conditions or events, and these materials
should not be relied upon for such purposes. The Underwriter and its affiliates,
officers, directors, partners and employees, including persons involved in the
preparation or issuance of these materials, may, from time to time, have long or
short positions in, and buy and sell, the securities mentioned herein or
derivatives thereof (including options). Information in these materials is
current as of the date appearing on the material only. Information in these
materials regarding any securities discussed herein supersedes all prior
information regarding such securities. These materials are not to be construed
as an offer to sell or the solicitation of any offer to buy any security in any
jurisdiction where such an offer or solicitation would be illegal.

- --------------------------------------------------------------------------------



                       [BANC OF AMERICA SECURITIES LOGO]

- --------------------------------------------------------------------------------

      The asset-backed securities referred to in these materials, and the asset
pools backing them, are subject to modification or revision (including the
possibility that one or more classes of securities may be split, combined or
eliminated at any time prior to issuance or availability of a final prospectus)
and are offered on a "when, as and if issued" basis. You understand that, when
you are considering the purchase of these securities, a contract of sale will
come into being no sooner than the date on which the relevant class has been
priced and we have confirmed the allocation of securities to be made to you; any
"indications of interest" expressed by you, and any "soft circles" generated by
us, will not create binding contractual obligations for you or us.

      Because the asset-backed securities are being offered on a "when, as and
if issued" basis, any such contract will terminate, by its terms, without any
further obligation or liability between us, if the securities themselves, or the
particular class to which the contract relates, are not issued. Because the
asset-backed securities are subject to modification or revision, any such
contract also is conditioned upon the understanding that no material change will
occur with respect to the relevant class of securities prior to the closing
date. If a material change does occur with respect to such class, our contract
will terminate, by its terms, without any further obligation or liability
between us (the "Automatic Termination"). If an Automatic Termination occurs, we
will provide you with revised offering materials reflecting the material change
and give you an opportunity to purchase such class. To indicate your interest in
purchasing the class, you must communicate to us your desire to do so within
such timeframe as may be designated in connection with your receipt of the
revised offering materials.

MBS New Issue Term Sheet - Collateral Appendix

Banc of America Mortgage 2005-12 Trust

Mortgage Pass-Through Certificates, Series 2005-12
$298,847,554 (approximate)

Banc of America Mortgage Securities, Inc.

(Depositor)

Bank of America, National Association

Seller and Servicer

[BANK OF AMERICA LOGO]

December 20, 2005

- --------------------------------------------------------------------------------

The issuer has filed a registration statement (including a prospectus) with the
SEC for the offering to which this communication relates. Before you invest, you
should read the prospectus in that registration statement and other documents
the issuer has filed with the SEC for more complete information about the issuer
and this offering. You may get these documents for free by visiting EDGAR on the
SEC Web site at www.sec.gov. Alternatively, the issuer, any underwriter or any
dealer participating in the offering will arrange to send you the prospectus if
you request it by calling toll-free 1-800-294-1322 or you e-mail a request to
dg.prospectus_distribution@bofasecurities.com. The securities may not be
suitable for all investors. Banc of America Securities LLC and its affiliates
may acquire, hold or sell positions in these securities, or in related
derivatives, and may have an investment or commercial banking relationship with
the issuer.

The information contained in these materials may be based on assumptions
regarding market conditions and other matters as reflected herein. Banc of
America Securities LLC (the "Underwriter") makes no representation regarding the
reasonableness of such assumptions or the likelihood that any such assumptions
will coincide with actual market conditions or events, and these materials
should not be relied upon for such purposes. The Underwriter and its affiliates,
officers, directors, partners and employees, including persons involved in the
preparation or issuance of these materials, may, from time to time, have long or
short positions in, and buy and sell, the securities mentioned herein or
derivatives thereof (including options). Information in these materials is
current as of the date appearing on the material only. Information in these
materials regarding any securities discussed herein supersedes all prior
information regarding such securities. These materials are not to be construed
as an offer to sell or the solicitation of any offer to buy any security in any
jurisdiction where such an offer or solicitation would be illegal.

- --------------------------------------------------------------------------------



- --------------------------------------------------------------------------------

[BANC OF AMERICA SECURITIES LOGO]      Banc of America Mortgage Securities, Inc.
                                     Mortgage Pass-Through Certificates, 2005-12
                                              $298,847,554 (approximate)

- --------------------------------------------------------------------------------

                             IRS CIRCULAR 230 NOTICE

THIS FREE WRITING PROSPECTUS IS NOT INTENDED OR WRITTEN TO BE USED, AND CANNOT
BE USED, FOR THE PURPOSE OF AVOIDING U.S. FEDERAL, STATE OR LOCAL TAX PENALTIES.
THIS FREE WRITING PROSPECTUS IS WRITTEN AND PROVIDED BY THE UNDERWRITERS IN
CONNECTION WITH THE PROMOTION OR MARKETING OF THE TRANSACTIONS OR MATTERS
ADDRESSED HEREIN. INVESTORS SHOULD SEEK ADVICE BASED ON THEIR PARTICULAR
CIRCUMSTANCES FROM AN INDEPENDENT TAX ADVISOR.

- --------------------------------------------------------------------------------
                               Collateral Summary
- --------------------------------------------------------------------------------

Description of The Mortgage Loans

The Mortgage Loans consist of fixed rate, conventional, fully amortizing
mortgage loans secured by first liens on one- to three-family residential
properties. The majority of the Mortgage Loans will have original terms to
stated maturity of approximately 30 years and principal balances at origination
in excess of the conforming loan balance limits established by FHLMC. Borrowers
are permitted to prepay their Mortgage Loans, in whole or in part, at any time
without penalty. Accordingly, the actual date on which any Mortgage Loan is paid
in full may be earlier than the stated maturity date due to unscheduled payments
of principal.

- --------------------------------------------------------------------------------

The tables set forth below contain approximate statistical information as of the
Cut-off Date regarding all Mortgage Loans. The balances and percentages may not
be exact due to rounding.



                                                          Collateral Summary    Range (if applicable)
- -------------------------------------------------------   ------------------   ----------------------
                                                                         
Total Outstanding Loan Balance                                  $300,350,131
Total Number of Loans                                                    529
Average Loan Principal Balance                                      $567,770   $298,156 to $1,948,012
WA Gross Coupon                                                        5.937%        5.125% to 7.125%
WA FICO                                                                  746               621 to 819
WA Original Term                                                  357 months        240 to 360 months
WA Remaining Term                                                 356 months        239 to 360 months
WA OLTV                                                                69.40%        23.81% to 90.00%
Geographic Concentration of Mortgaged Properties (Top 5      CA        47.47%
States) based on the Aggregate Stated Principal Balance      FL         8.05%
                                                             TX         4.90%
                                                             MA         3.71%
                                                             VA         3.63%


                               Mortgage Loan Data



                                                                  All                     Discount                  Premium
                                                             Mortgage Loans            Mortgage Loans            Mortgage Loans
- ------------------------------------------------------   ----------------------    ----------------------    ----------------------
                                                                                                    
Number of Mortgage Loans                                           529                       388                       141
Aggregate Stated Principal Balance (1)                        $300,350,131              $221,795,965               $78,554,166
Range of Original Terms to Stated Maturity (1)             240 to 360 months         240 to 360 months         240 to 360 months
Range of Stated Principal Balances (1)                   $298,156 to $1,948,012    $298,156 to $1,948,012    $403,514 to $1,067,785
Average Stated Principal Balance (1)                            $567,770                  $571,639                  $557,122
Latest Stated Maturity Date                                    12/01/2035                12/01/2035                12/01/2035
Range of Current Mortgage Interest Rates (1)                5.125% to 7.125%          5.125% to 6.000%          6.125% to 7.125%
Weighted Average Current Mortgage Interest Rate (1)               5.94%                     5.82%                     6.27%
Range of Remaining Terms to Stated Maturity (1)            239 to 360 months         239 to 360 months         239 to 360 months
Weighted Average Remaining Term to Stated Maturity (1)         356 months                357 months                354 months
Range of Original Loan-to-Value Ratios (1)                  23.81% to 90.00%          23.81% to 90.00%          32.63% to 80.00%
Weighted Average Original Loan-to-Value Ratio (1)                 69.40%                    69.40%                    69.41%


(1) Approximate.

           Occupancy of Mortgaged Properties of the Mortgage Loans (1)

                                                Aggregate            % of
                                Number Of   Stated Principal     Cut-off Date
                                Mortgage      Balance as of     Pool Principal
Occupancy                         Loans       Cut-off Date         Balance
- -----------------------------   ---------   -----------------   --------------
Primary Residence                     483     $273,113,768.82            90.93%
Second Home                            46       27,236,361.70             9.07
- -----------------------------   ---------   -----------------   --------------
Total:                                529     $300,350,130.52           100.00%

(1)   Based solely on representations of the mortgagor at the time of
      origination of the related Mortgage Loan.

                      Property Types of the Mortgage Loans

                                                Aggregate            % of
                                Number Of   Stated Principal     Cut-off Date
                                Mortgage      Balance as of     Pool Principal
Property Type                     Loans       Cut-off Date         Balance
- -----------------------------   ---------   -----------------   --------------
Single Family Residence               364     $203,903,094.12            67.89%
PUD-Detached                           97       56,249,697.41            18.73
Condominium                            48       27,818,200.13             9.26
2-Family                                6        4,375,922.26             1.46
PUD-Attached                            7        3,679,193.67             1.22
3-Family                                3        2,094,927.16             0.70
Townhouse                               3        1,742,081.08             0.58
Cooperative                             1          487,014.69             0.16
- -----------------------------   ---------   -----------------   --------------
Total:                                529     $300,350,130.52           100.00%

                   Mortgage Loan Purpose of the Mortgage Loans

                                                Aggregate            % of
                                Number Of   Stated Principal     Cut-off Date
                                Mortgage      Balance as of     Pool Principal
Purpose                           Loans       Cut-off Date         Balance
- -----------------------------   ---------   -----------------   --------------
Purchase                              286     $165,810,510.89            55.21%
Refinance-Rate/Term                   126       73,434,913.79            24.45
Refinance-Cashout                     117       61,104,705.84            20.34
- -----------------------------   ---------   -----------------   --------------
Total:                                529     $300,350,130.52           100.00%


              Geographical Distribution of the Mortgage Properties
                            of the Mortgage Loans (1)

                                                Aggregate            % of
                                Number Of   Stated Principal     Cut-off Date
                                Mortgage      Balance as of     Pool Principal
Geographic Area                   Loans       Cut-off Date         Balance
- -----------------------------   ---------   -----------------   --------------
Alabama                                 1         $671,246.99             0.22%
Arizona                                 9        5,177,177.61             1.72
Arkansas                                1          422,601.32             0.14
California                            252      142,586,159.76            47.47
Colorado                                8        5,063,191.59             1.69
Connecticut                             4        2,059,191.66             0.69
District of Columbia                    5        2,525,392.79             0.84
Florida                                45       24,169,838.43             8.05
Georgia                                 6        3,107,379.72             1.03
Hawaii                                  1          824,138.65             0.27
Idaho                                   2        1,263,402.69             0.42
Illinois                               15        8,889,072.41             2.96
Indiana                                 3        1,344,546.70             0.45
Kansas                                  2        1,496,674.23             0.50
Kentucky                                1          494,483.19             0.16
Maine                                   3        1,631,997.96             0.54
Maryland                               18        9,470,561.91             3.15
Massachusetts                          19       11,145,637.95             3.71
Michigan                                3        1,608,140.21             0.54
Minnesota                               6        2,880,970.59             0.96
Missouri                                2        1,021,054.62             0.34
Nevada                                 11        5,265,174.90             1.75
New Hampshire                           2        2,723,257.66             0.91
New Jersey                              9        5,589,026.93             1.86
New Mexico                              2          975,720.91             0.32
New York                               12        7,538,596.05             2.51
North Carolina                          3        1,863,667.66             0.62
Ohio                                    2        1,030,994.49             0.34
Oklahoma                                1          464,714.29             0.15
Oregon                                  1          782,342.74             0.26
Pennsylvania                            8        4,844,617.32             1.61
Rhode Island                            3        1,655,827.28             0.55
South Carolina                          8        4,833,128.74             1.61
Tennessee                               1          431,515.92             0.14
Texas                                  24       14,728,360.27             4.90
Utah                                    1          799,239.31             0.27
Vermont                                 3        1,797,074.61             0.60
Virginia                               20       10,909,570.08             3.63
Washington                             11        5,768,911.01             1.92
Wisconsin                               1          495,529.37             0.16
- -----------------------------   ---------   -----------------   --------------
Total:                                529     $300,350,130.52           100.00%

(1)   As of the Cut-off Date, no more than approximately 0.88% of the Mortgage
      Loans are expected to be secured by mortgaged properties in any one
      five-digit postal zip code.

       Current Mortgage Loan Principal Balances of the Mortgage Loans (1)

                                                Aggregate            % of
                                Number Of   Stated Principal     Cut-off Date
Current Mortgage Loan           Mortgage      Balance as of     Pool Principal
Principal Balances ($)            Loans       Cut-off Date         Balance
- -----------------------------   ---------   -----------------   --------------
250,000.01 - 300,000.00                 1         $298,156.13             0.10%
400,000.01 - 450,000.00               104       45,002,448.34            14.98
450,000.01 - 500,000.00               136       64,835,057.31            21.59
500,000.01 - 550,000.00                78       40,974,789.51            13.64
550,000.01 - 600,000.00                54       31,124,798.02            10.36
600,000.01 - 650,000.00                49       30,703,414.22            10.22
650,000.01 - 700,000.00                34       23,033,503.35             7.67
700,000.01 - 750,000.00                13        9,359,873.86             3.12
750,000.01 - 800,000.00                14       10,871,972.42             3.62
800,000.01 - 850,000.00                11        9,125,177.10             3.04
850,000.01 - 900,000.00                12       10,514,470.19             3.50
900,000.01 - 950,000.00                 5        4,571,358.58             1.52
950,000.01 - 1,000,000.00              11       10,889,486.15             3.63
1,000,000.01 - 1,500,000.00             6        7,097,613.45             2.36
1,500,000.01 - 2,000,000.00             1        1,948,011.89             0.65
- -----------------------------   ---------   -----------------   --------------
Total:                                529     $300,350,130.52           100.00%

(1)   As of the Cut-off Date, the average outstanding principal balance of the
      Mortgage Loans is expected to be approximately $567,770.

             Original Loan-To-Value Ratios of the Mortgage Loans (1)

                                                Aggregate            % of
                                Number Of   Stated Principal     Cut-off Date
Original Loan-To-Value Ratios   Mortgage      Balance as of     Pool Principal
(%)                               Loans       Cut-off Date         Balance
- -----------------------------   ---------   -----------------   --------------
20.01 - 25.00                           1         $630,870.00             0.21%
25.01 - 30.00                           1          449,530.17             0.15
30.01 - 35.00                           3        1,315,275.73             0.44
35.01 - 40.00                          17        9,311,078.36             3.10
40.01 - 45.00                           9        5,718,907.30             1.90
45.01 - 50.00                          25       13,890,247.34             4.62
50.01 - 55.00                          28       14,983,992.95             4.99
55.01 - 60.00                          37       19,853,583.95             6.61
60.01 - 65.00                          43       25,778,914.93             8.58
65.01 - 70.00                          69       41,873,064.25            13.94
70.01 - 75.00                          48       26,904,253.50             8.96
75.01 - 80.00                         243      137,339,689.34            45.73
85.01 - 90.00                           5        2,300,722.70             0.77
- -----------------------------   ---------   -----------------   --------------
Total:                                529     $300,350,130.52           100.00%

(1)   As of the Cut-off Date, the weighted average Loan-to-Value Ratio at
      origination of the Mortgage Loans is expected to be approximately 69.40%.

            Current Mortgage Interest Rates of the Mortgage Loans (1)

                                                Aggregate            % of
                                Number Of   Stated Principal     Cut-off Date
Current Mortgage                Mortgage      Balance as of     Pool Principal
Interest Rates (%)                Loans       Cut-off Date         Balance
- -----------------------------   ---------   -----------------   --------------
5.001 - 5.250                           6       $3,118,940.24             1.04%
5.251 - 5.500                          25       13,187,505.39             4.39
5.501 - 5.750                         125       71,717,336.13            23.88
5.751 - 6.000                         232      133,772,182.86            44.54
6.001 - 6.250                         104       57,954,088.82            19.30
6.251 - 6.500                          29       16,012,828.48             5.33
6.501 - 6.750                           6        3,492,146.90             1.16
6.751 - 7.000                           1          539,546.33             0.18
7.001 - 7.250                           1          555,555.37             0.18
- -----------------------------   ---------   -----------------   --------------
Total:                                529     $300,350,130.52           100.00%

(1)   As of the Cut-off Date, the weighted average Current Mortgage Interest
      Rate of the Mortgage Loans is expected to be approximately 5.937% per
      annum.

                    Remaining Terms of the Mortgage Loans (1)

                                                Aggregate            % of
                                Number Of   Stated Principal     Cut-off Date
                                Mortgage      Balance as of     Pool Principal
Remaining Term (Months)           Loans       Cut-off Date         Balance
- -----------------------------   ---------   -----------------   --------------
221 - 240                              11       $6,133,046.68             2.04%
281 - 300                               1          576,095.96             0.19
341 - 360                             517      293,640,987.88            97.77
- -----------------------------   ---------   -----------------   --------------
Total:                                529     $300,350,130.52           100.00%

(1)   As of the Cut-off Date, the weighted average remaining term to stated
      maturity of the Mortgage Loans is expected to be approximately 356 months.

             Credit Scoring of Mortgagors of the Mortgage Loans (1)

                                                Aggregate            % of
                                Number Of   Stated Principal     Cut-off Date
                                Mortgage      Balance as of     Pool Principal
Credit Scores                     Loans       Cut-off Date         Balance
- -----------------------------   ---------   -----------------   --------------
801 - 850                              29      $17,939,571.66             5.97%
751 - 800                             256      147,873,786.94            49.23
701 - 750                             153       86,818,402.71            28.91
651 - 700                              72       37,717,111.20            12.56
601 - 650                              19       10,001,258.01             3.33
- -----------------------------   ---------   -----------------   --------------
Total:                                529     $300,350,130.52           100.00%

(1)   The scores shown are Bureau Credit Scores from Experian (FICO), Equifax
      (Beacon) and TransUnion (Empirica).