No exemption shall be allowed under section 151(e) for any dependent who has made a joint return with his spouse under section 6013 for the taxable year beginning in the calendar year in which the taxable year of the taxpayer begins. The amount provided in section 151(e)(1)(A) is $750 in the case of a taxable year beginning after December 31, 1972; $700 in the case of a taxable year beginning after December 31, 1971, and before January 1, 1973; $650 in the case of a taxable year beginning after December 31, 1970, and before January 1, 1972; $625 in the case of a taxable year beginning after December 31, 1969, and before January 1, 1971; and $600 in the case of a taxable year beginning before January 1, 1970. For special rules in the case of a taxpayer whose taxable year is a fiscal year ending after December 31, 1969, and beginning before January 1, 1973, see section 21(d) and the regulations thereunder.
26 C.F.R. §1.151-2