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:  June 28, 2004
(Date of earliest event reported)

Commission File No. 333-105940



                    Banc of America Mortgage Securities, Inc.
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                Delaware                                36-4514369
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         (State of Incorporation)          (I.R.S. Employer Identification No.)



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



                                 (704) 387-8239
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              Registrant's Telephone Number, including area code




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  (Former name, former address and former fiscal year, if changed since last
                                   report)



ITEM 5.     Other Events

            On June 28, 2004, Banc of America Mortgage Securities, Inc., a
Delaware corporation (the "Registrant"), sold Banc of America Alternative Loan
Trust 2004-6 Mortgage Pass-Through Certificates, Series 2004-6, Class 1-A-1,
Class 1-A-R, Class 1-A-LR, Class 2-A-1, Class CB-IO, Class 3-A-1, Class 3-A-2,
Class 3-A-3, Class 4-A-1, Class 4-IO, Class X-PO, Class 15-PO, Class 30-B-1,
Class 30-B-2, Class 30-B-3, Class 4-B-1, Class 4-B-2 and Class 4-B-3 (the
"Offered Certificates"), having an aggregate original principal balance of
$440,078,320. The Offered Certificates were issued pursuant to a Pooling and
Servicing Agreement, dated June 28, 2004, 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 2004-6, Class 30-B-4, Class 30-B-5 Class
30-B-6, Class 4-B-4, Class 4-B-5 and Class 4-B-6 Certificates, having an
aggregate initial principal balance of $4,527,785 (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 98.98% undivided interest in a trust (the "Trust"),
consisting principally of four 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 two separate REMICs for
federal income tax purposes (the "Upper-Tier REMIC" and the "Lower-Tier REMIC"
and each, a "REMIC"). The Class 1-A-1, Class 1-A-R, Class 1-A-LR, Class 2-A-1,
Class 3-A-1, Class 3-A-2, Class 3-A-3, Class 4-A-1, Class 4-IO, Class 15-PO,
Class 30-B-1, Class 30-B-2, Class 30-B-3, Class 30-B-4, Class 30-B-5, Class
30-B-6, Class 4-B-1, Class 4-B-2, Class 4-B-3, Class 4-B-4, Class 4-B-5 and
Class 4-B-6 Certificates and each Class IO and Class X-PO Component will be
treated as "regular interests" in the REMIC and the Class 1-A-R and Class 1-A-LR
Certificates will be treated as the "residual interest" in the Upper-Tier REMIC
and the Lower-Tier REMIC, respectively.



ITEM 7.     Financial Statements and Exhibits
            ---------------------------------

            (c)   Exhibits

Item 601(a)
of Regulation S-K
Exhibit No.                            Description
- ----------                             ------------
      (EX-4)                           Pooling and Servicing Agreement, dated
                                       June 28, 2004, 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.


June 28, 2004



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



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


   (EX-4)                   Pooling and Servicing Agreement,    E
                            dated June 28, 2004 among Banc
                            of America Mortgage Securities,
                            Inc., Bank of America, N.A. and
                            Wells Fargo Bank, N.A., as
                            trustee.