Code of Federal Regulations Title 26. Internal Revenue § 26.1.6425–2 Computation of adjustment of overpayment of estimated tax

(a) Income tax liability defined. For purposes of § 1.6425–1, this section, §§ 1.6425–3 and 1.6655–7, relating to excessive adjustment, the term income tax liability means the excess of—

(b) Computation of adjustment.The amount of an adjustment under section 6425 is an amount equal to the excess of the estimated income tax paid by the corporation during the taxable year over the amount which, at the time of filing Form 4466, the corporation estimates as its income tax liability for the taxable year.

(c) Effective/applicability date. Paragraph (a) of this section is applicable to applications for adjustments of overpayments of estimated income tax that are filed in taxable years beginning after September 6, 2007.