applicable amount
(1) In general For purposes of this section, the term “applicable amount” means— (A) $300,000 in the case of a joint return or a surviving spouse (as defined in section 2(a)), (B) $275,000 in the case of a head of household (as defined in section 2(b)), (C) $250,000 in the case of an individual who is not married and who is not a surviving spouse or head of household, and (D) ½ the amount applicable under subparagraph (A) (after adjustment, if any, under paragraph (2)) in the case of a married individual filing a separate return. For purposes of this paragraph, marital status shall be determined under section 7703.