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 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.