“ ACCELERATION OF 10 PERCENT INCOME TAX RATE BRACKET BENEFIT FOR 2001. `` (a) In General.—In the case of an eligible individual, there shall be allowed as a credit against the tax imposed by chapter 1 for the taxpayer's first taxable year beginning in 2001 an amount equal to 5 percent of so much of the taxpayer's taxable income as does not exceed the initial bracket amount (as defined in section 1 (i) (1) (B) ) . ”

“ Timing of payments.—In the case of any overpayment attributable to this subsection, the Secretary shall, subject to the provisions of this title, refund or credit such overpayment as rapidly as possible and, to the extent practicable, before October 1, 2001. ”