UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934

Date of Report:  April 28, 2005
(Date of earliest event reported)



                    Banc of America Mortgage Securities, Inc.
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             (Exact name of registrant as specified in its charter)

      Delaware                       333-118843                 36-4514369
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(State or other jurisdiction    (Commission File No.)         (IRS Employer
of incorporation)                                           Identification No.)

  201 North Tryon Street, Charlotte, North Carolina                 28255
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Address of principal executive offices                            (Zip Code)

Registrant's telephone number, including area code           (704) 387-8239
                                                  ------------------------------


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          (Former name or former address, if changed since last report)


Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

[ ] Written communications pursuant to Rule 425 under the Securities Act (17
CFR 230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17
CFR 240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the
Exchange Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the
Exchange Act (17 CFR 240.13e-4(c))




ITEM 8.01.    Other Events
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On April 28, 2005, Banc of America Mortgage Securities, Inc., a Delaware
corporation (the "Registrant"), sold Banc of America Alternative Loan Trust
2005-4 Mortgage Pass-Through Certificates, Series 2005-4, Class CB-1, Class
CB-2, Class CB-3, Class CB-4, Class CB-5, Class CB-6, Class CB-7, Class CB-8,
Class CB-9, Class CB-10, Class CB-11, Class CB-12, Class CB-13, Class CB-R,
Class CB-IO, Class 2-A-1, Class 3-A-1, Class 15-IO, Class A-PO, Class B-1, Class
B-2 and Class B-3 (the "Offered Certificates"), having an aggregate original
principal balance of $353,152,580.00. The Offered Certificates were issued
pursuant to a Pooling and Servicing Agreement, dated April 28, 2005, among the
Registrant, Bank of America, N.A., as servicer ("BANA"), and Wells Fargo Bank,
N.A., as trustee (the "Agreement"), a copy of which is filed as an exhibit
hereto. Mortgage Pass-Through Certificates, Series 2005-4, Class B-4, Class B-5
and Class B-6 Certificates, having an aggregate initial principal balance of
$3,207,420.00 (the "Private Certificates" and, together with the Offered
Certificates, the "Certificates"), were also issued pursuant to the Agreement.

As of the date of initial issuance, the Offered Certificates evidenced an
approximate 99.10% undivided interest in a trust (the "Trust"), consisting
principally of three pools of fixed interest rate, conventional, monthly pay,
fully-amortizing, one- to four-family residential first mortgage loans. The
remaining undivided interests in the Trust are evidenced by the Private
Certificates distributions on which are subordinated to distributions on the
Offered Certificates.

Interest on the Offered Certificates will be distributed on each Distribution
Date (as defined in the Agreement). Monthly distributions in reduction of the
principal balance of the Offered Certificates will be allocated to the Offered
Certificates in accordance with the priorities set forth in the Agreement.
Distributions of interest and in reduction of principal balance on any
Distribution Date will be made to the extent that the related Pool Distribution
Amount is sufficient therefor.

Elections will be made to treat the Trust as three separate REMICs for federal
income tax purposes (the "Lower-Tier REMIC," "Middle-Tier REMIC" and "Upper-Tier
REMIC" and each a "REMIC"). The Class CB-1, Class CB-2, Class CB-3, Class CB-4,
Class CB-5, Class CB-6, Class CB-7, Class CB-8, Class CB-9, Class CB-10, Class
CB-11, Class CB-12, Class CB-13, Class CB-IO, Class 2-A-1, Class 3-A-1, Class
B-1, Class B-2, Class B-3, Class B-4, Class B-5 and Class B-6 Certificates and
each IO Component and each PO Component will be treated as "regular interests"
in the Upper-REMIC and the Class CB-R Certificate will be treated as the
"residual interest" in the Upper-Tier REMIC, Middle-Tier REMIC and "Lower-Tier
REMIC, respectively.




ITEM 9.01     Financial Statements and Exhibits
              ---------------------------------

 (c)  Exhibits

Item 601(a)
of Regulation S-K
Exhibit No.                            Description
- -----------                            -----------

      (4)                              Pooling and Servicing Agreement, dated
                                       April 28, 2005, among Banc of America
                                       Mortgage Securities, Inc., Bank of
                                       America, N.A. and Wells Fargo Bank, N.A.,
                                       as trustee.




Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                       BANC OF AMERICA MORTGAGE
                                         SECURITIES, INC.


April 28, 2005

                                    By:  /s/ Judy Lowman
                                         -----------------
                                         Name:  Judy Lowman
                                         Title: Vice President




                                INDEX TO EXHIBITS

                                                              Paper (P) or
Exhibit No.                 Description                       Electronic (E)
- -----------                 -----------                       --------------

   (4)                      Pooling and Servicing Agreement,    E
                            dated April 28, 2005 among Banc
                            of America Mortgage Securities,
                            Inc., Bank of America, N.A. and
                            Wells Fargo Bank, N.A., as
                            trustee.