Pub. L. 110–234 and Pub. L. 110–246 made identical amendments to this section. The amendments by Pub. L. 110–234 were repealed by section 4(a) of Pub. L. 110–246.

2008—Subsec. (b). Pub. L. 110–246, § 15352(b)(3)(A), substituted “Except as provided in subsection (c), for the purposes” for “For the purposes” in introductory provisions.

Subsec. (c). Pub. L. 110–246, § 15352(b)(3)(B), added subsec. (c).

1977—Pub. L. 95–216 designated existing provisions as subsec. (a), substituted provisions relating to crediting of self-employment income to calendar years for provisions relating to crediting of self-employment income to calendar quarters, and added subsec. (b).

Amendment of this section and repeal of Pub. L. 110–234 by Pub. L. 110–246 effective May 22, 2008, the date of enactment of Pub. L. 110–234, except as otherwise provided, see section 4 of Pub. L. 110–246, set out as an Effective Date note under section 8701 of Title 7, Agriculture.

Amendment by section 15352(b)(3) of Pub. L. 110–246 applicable to taxable years beginning after Dec. 31, 2007, see section 15352(c) of Pub. L. 110–246, set out as a note under section 1402 of Title 26, Internal Revenue Code.

Amendment by Pub. L. 95–216 effective Jan. 1, 1978, see section 351(d) of Pub. L. 95–216, set out as a note under section 409 of this title.