Prospectus Supplement

(To Prospectus Dated November 22, 2004)

Bankof America

Banc of America Mortgage Securities, Inc.


Bank of America, N.A.

Seller and Servicer

  • 584,340,100
  • Approximate)

Mortgage Pass-Through Certificates, Series 2005-A

Principal and interest payable monthly, commencing in February 2005

The Trust will Issue—

  • Four groups consisting of eleven classes of Senior Certificates.
  • Six classes of Class B Certificates all of which are subordinated to, and provide credit enhancement for, the Senior Certificates. Each class of Class B Certificates is also subordinated to each class of Class B Certificates, if any, with a lower number.

The classes of Offered Certificates are listed under the heading "Offered Certificates" in the table beginning on page S-4.

The Assets of the Trust will Include—

• Four loan groups of fully amortizing, adjustable interest rate, one- to four-family, residential first mortgage loans, substantially all of which have original terms to stated maturity of approximately 10 to 30 years.

You should carefully consider the risk factors beginning on page S-16 of this prospectus supplement.

Neither the Offered Certificates nor the underlying mortgage loans are insured or guaranteed by any governmental agency or instrumentality.

The Offered Certificates will represent interests in the Trust only and will not represent interests in or obligations of Banc of America Mortgage Securities, Inc. or any other entity.

This prospectus supplement may be used to offer and sell the Offered Certificates only if accompanied by the prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved the Offered Certificates or determined that this prospectus supplement or the prospectus is accurate or complete. Any representation to the contrary is a criminal offense.

The Class A Certificates will be offered by the underwriters at varying prices to be determined at the time of sale to investors. The Class B Certificates offered by this prospectus supplement will be offered by Banc of America Securities LLC at varying prices to be determined at the time of sale to investors. The Offered Certificates are expected to be delivered on or about January 27, 2005. Total proceeds to the Depositor for the Offered Certificates will be approximately 99.811% of the initial principal balance of the Offered Certificates, before deducting expenses payable by the Depositor.

Banc of America Securities LLC Bear, Stearns & Co. Inc. Lehman Brothers

January 21, 2005

Source: Banc of America Mortgage Securities, Inc., Mortgage Pass-Through Certificates, Series 2005-A, Prospectus filed pursuant to rule 424, available at the Securities and Exchange Commission Web site:, central index key (CIK) number 0001315171.

Footnotes 4 through 8 in Exhibit 7-4 provide the investor with the detailed information about how the interest rate on each security will be calculated. Continuing our example for class 1-A-1, the investor will receive interest at the weighted average of the net mortgage interest rates of the group 1 loans. However, for the first 23 periods, that interest rate will be reduced by 0.3170%.


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