Section was formerly classified to section 621 of this title prior to renumbering by Pub. L. 109–288.

A prior section 623, act Aug. 14, 1935, ch. 531, title IV, § 423, as added Pub. L. 90–248, title II, § 240(c), Jan. 2, 1968, 81 Stat. 913, and amended, which related to payment to States, was renumbered section 424 of act Aug. 14, 1935, by Pub. L. 109–288, § 6(b)(2), Sept. 28, 2006, 120 Stat. 1244, and transferred to section 624 of this title.

2006—Subsec. (a). Pub. L. 109–288, § 11(a)(1)(B), substituted “The Secretary” for “He”.

Pub. L. 109–288, § 6(d)(1), inserted heading and substituted “section 625” for “section 620”.

Subsec. (b). Pub. L. 109–288, § 11(a)(1)(A), which directed amendment of section by substituting “percent” for “per centum”, was executed by making the substitution wherever appearing in subsec. (b), to reflect the probable intent of Congress.

Pub. L. 109–288, § 6(d)(2), inserted heading.

Subsec. (c). Pub. L. 109–288, § 6(d)(3), inserted heading.

Subsec. (d). Pub. L. 109–288, § 6(d)(4), inserted heading and substituted “50” for “fifty”.

Subsec. (e). Pub. L. 109–288, § 6(d)(5), added subsec. (e).

1987—Subsec. (b). Pub. L. 100–203 substituted “Guam, and American Samoa” for “and Guam”.

1980—Pub. L. 96–272 designated existing provisions as subsec. (a) and added subsecs. (b) to (d).

Amendment by Pub. L. 109–288 effective Oct. 1, 2006, and applicable to payments under this part and part E of this subchapter for calendar quarters beginning on or after such date, without regard to whether implementing regulations have been promulgated, and with delay permitted if State legislation is required to meet additional requirements, see section 12(a), (b) of Pub. L. 109–288, set out as a note under section 621 of this title.

Section 9135(c) of Pub. L. 100–203 provided that: “The amendments made by this section [amending this section and sections 1301 and 1397b of this title] shall apply with respect to fiscal years beginning on or after October 1, 1988.”