Pub. L. 92-178, tit. II, sec. 202
INCREASE IN PERCENTAGE STANDARD DEDUCTION.
SEC. 202. INCREASE IN PERCENTAGE STANDARD DEDUCTION.Effective with respect to taxable years beginning after December 31, 1971, the last two lines in the table in section 141(b) (relating to percentage standard deduction) are amended to read as follows: “1972 and thereafter 15 2,000”.