; and (B) 2 percent to be provided to Indian tribes in accordance with paragraph (4). (4) Allocation to Indian tribes Of the amount allocated for Indian tribes under paragraph (3)(B), the Secretary shall allocate funds to each Indian tribe participating in the program during that fiscal year based on a formula established by the Secretary that takes into account any factor that the Secretary determines to be appropriate. (5) Publication of allocation formulas Not later than 90 days before the beginning of each fiscal year for which grants are provided to States and Indian tribes under this section, the Secretary shall publish in the Federal Register the formulas for allocation established under this subsection. 102. Mortgage interest tax credit (a) Allowance of credit (1) In general Subpart A of part IV of subchapter A of chapter 1 of the Internal Revenue Code of 1986 is amended by inserting after section 25D the following new section: 25A–1. Mortgage interest (a) In general There shall be allowed as a credit against the tax imposed by this chapter for the taxable year an amount equal to 15 percent of the qualified mortgage interest paid or accrued by the taxpayer during the taxable year. (b) Qualified mortgage interest For purposes of this section— (1) In general The term qualified mortgage interest means interest paid or accrued on acquisition indebtedness (as defined in section 163(h)(3)(B)(i)) with respect to a residence of the taxpayer which is the principal residence (within the meaning of section 121) of the taxpayer. (2) Limitation The aggregate amount treated as acquisition indebtedness for purposes of this section for any period shall not exceed the limitation governing the maximum original principal obligation for a mortgage secured by a single-family residence, as determined and adjusted annually under section 302(b)(2) of the Federal National Mortgage Association Charter Act ( 12 U.S.C. 1717(b)(2) ) and section 305(a)(2) of the Federal Home Loan Mortgage Corporation Act ( 12 U.S.C. 1454(a)(2) ). (3)