§ 1314.
(a)
Ascertainment of amount of adjustment
In computing the amount of an adjustment under this part there shall first be ascertained the tax previously determined for the taxable year with respect to which the error was made. The amount of the tax previously determined shall be the excess of—
(1)
the sum of—
(A)
the amount shown as the tax by the taxpayer on his return (determined as provided in section 6211(b)(1), (3), and (4), relating to the definition of deficiency), if a return was made by the taxpayer and an amount was shown as the tax by the taxpayer thereon, plus
(B)
the amounts previously assessed (or collected without assessment) as a deficiency, over—
(2)
the amount of rebates, as defined in section 6211(b)(2), made.
There shall then be ascertained the increase or decrease in tax previously determined which results solely from the correct treatment of the item which was the subject of the error (with due regard given to the effect of the item in the computation of gross income, taxable income, and other matters under this subtitle). A similar computation shall be made for any other taxable year affected, or treated as affected, by a net operating loss deduction (as defined in section 172) or by a capital loss carryback or carryover (as defined in section 1212), determined with reference to the taxable year with respect to which the error was made. The amount so ascertained (together with any amounts wrongfully collected as additions to the tax or interest, as a result of such error) for each taxable year shall be the amount of the adjustment for that taxable year.
([Aug. 16, 1954, ch. 736], [68A Stat. 340]; [Pub. L. 85–866, title I, § 59(b)], Sept. 2, 1958, [72 Stat. 1647]; [Pub. L. 89–44, title VIII, § 809(d)(5)(B)], June 21, 1965, [79 Stat. 168]; [Pub. L. 91–172, title V, § 512(f)(7)], (8), Dec. 30, 1969, [83 Stat. 641], 642; [Pub. L. 94–455, title XIX, § 1906(b)(13)(A)], Oct. 4, 1976, [90 Stat. 1834]; [Pub. L. 113–295, div. A, title II, § 221(a)(87)], Dec. 19, 2014, [128 Stat. 4050].)