Threshold amount
For purposes of paragraph (1)(B), the threshold amount shall be—
(A) in the case of a joint return or a surviving spouse (as defined in section 2(a)), $150,000,
(B) in the case of a head of household (as defined in section 2(b)), $112,500, and
(C) in the case of a taxpayer not described in subparagraph (A) or (B), $75,000.