26 U.S.C. § 75
(a) Adjustment for bond premium In computing the gross income of a taxpayer who holds during the taxable year a municipal bond (as defined in subsection (b)(1)) primarily for sale to customers in the ordinary course of his trade or business—
Notwithstanding the provisions of paragraph (1), no reduction to the cost of securities sold during the taxable year shall be made in respect of any obligation described in subsection (b)(1)(A)(ii) which is held by the taxpayer at the close of the taxable year; but in the taxable year in which any such obligation is sold or otherwise disposed of, if such obligation is a municipal bond (as defined in subsection (b)(1)), the cost of securities sold during such year shall be reduced by an amount equal to the adjustment described in paragraph (2), without regard to the fact that the taxpayer values his inventories on any basis other than cost.
(b) Definitions For purposes of subsection (a)—
(1) The term “municipal bond” means any obligation issued by a government or political subdivision thereof if the interest on such obligation is excludable from gross income; but such term does not include such an obligation if—
(A)
(B) when it is sold or otherwise disposed of by the taxpayer—
is higher than its adjusted basis (computed without regard to this section and section 1016(a)(6)).
Determinations under subparagraph (B) shall be exclusive of interest.
(2) The term “cost of securities sold” means the amount ascertained by subtracting the inventory value of the closing inventory of a taxable year from the sum of—
(Aug. 16, 1954, ch. 736, 68A Stat. 25; Pub. L. 85–866, title I, § 2(a), , 72 Stat. 1606.)
1958—Subsec. (a). Pub. L. 85–866, § 2(a)(2), (3), struck out “short-term” each place it appeared, and inserted sentence to provide that no reduction to cost of securities sold during taxable year shall be made in respect of subsec. (b)(1)(A)(ii) obligations held at close of year, and to permit reduction in cost of securities sold in taxable year sold if obligation is municipal bond.
Subsec. (b)(1). Pub. L. 85–866, § 2(a)(1), substituted “municipal bond” for “short-term municipal bond”, designated former subpars. (A) and (B) as (A)(i) and (ii), respectively, and added subpar. (B).
Pub. L. 85–866, § 2(c), , 72 Stat. 1607, provided that:
“The amendments made by subsections (a) and (b) [amending this section and
section 1016 of this title] shall apply with respect to taxable years ending after
December 31, 1957, but only with respect to obligations acquired after such date.”