Federal income tax deduction shall include federal income tax, foreign income tax, surtaxes imposed on income or excess profits taxes, less any credits allowed by the Internal Revenue Service. The deduction for federal income taxes allowed on the Oklahoma income tax return is computed as though the taxpayer were on the accrual basis of accounting. [See: 68 O.S. § 2358(E)(7)(c) ]
Okla. Admin. Code § 710:50-15-54