of 1986 is amended to read as follows: (1) in the case of the tax imposed by section 1401(a), an amount equal to— (A) $250,000, reduced (but not below zero) by (B) the sum of— (i) the part of the net earnings from self-employment (if any) which is not in excess of— (I) the amount equal to the contribution and benefit base (as determined under section 230 of the Social Security Act) which is effective for the calendar year in which such taxable year begins, minus (II) the amount of the wages paid to such individual during such taxable year, plus (ii) the amount of the wages paid to such individual during such taxable year which is in excess of the amount in clause (i)(I)