Initial amount

(A) In general Except as provided in subparagraph (B), the initial amount shall be— (i) $5,000 in the case of a single individual, or a joint return where only one spouse is a qualified individual, (ii) $7,500 in the case of a joint return where both spouses are qualified individuals, or (iii) $3,750 in the case of a married individual filing a separate return.

(B) Limitation in case of individuals who have not attained age 65 (i) In general In the case of a qualified individual who has not attained age 65 before the close of the taxable year, except as provided in clause (ii), the initial amount shall not exceed the disability income for the taxable year. (ii) Special rules in case of joint return In the case of a joint return where both spouses are qualified individuals and at least one spouse has not attained age 65 before the close of the taxable year— (I) if both spouses have not attained age 65 before the close of the taxable year, the initial amount shall not exceed the sum of such spouses’ disability income, or (II) if one spouse has attained age 65 before the close of the taxable year, the initial amount shall not exceed the sum of $5,000 plus the disability income for the taxable year of the spouse who has not attained age 65 before the close of the taxable year. (iii) Disability income For purposes of this subparagraph, the term “disability income” means the aggregate amount includable in the gross income of the individual for the taxable year under section 72 or 105(a) to the extent such amount constitutes wages (or payments in lieu of wages) for the period during which the individual is absent from work on account of permanent and total disability.