Okla. Stat. tit. 68 § 2365
Except as otherwise provided for in the Pass-Through Entity Tax Equity Act of 2019, the provisions, applicable to the taxation of income of corporations and stockholders, electing treatment as provided in subchapter S of the Internal Revenue Code, shall apply to taxpayers as provided under this act. A corporation having an election in effect under subchapter S of the Internal Revenue Code shall not be subject to the Oklahoma income tax on corporations and for tax years beginning after December 31, 1996, shall not be subject to the tax imposed by subsection A of Section 2370 of this title, and the shareholders of such corporation shall include in their taxable incomes their proportionate part of the federal income of such corporation, subject to the modifications as set forth in Sections 2358, 2362 and 2370.2 of this title, in the same manner and to the same extent as provided by the Internal Revenue Code. However, if any of the shareholders of such corporation are nonresidents during any part of the taxable year of the corporation, such corporation shall be taxable for such year on that part of the income of the corporation, as determined pursuant to Sections 2358, 2362 and 2370.2 of this title, allocable to the shares of stock owned by such nonresident unless (i) the corporation files with its return for such year an agreement executed by each nonresident stockholder stating that such nonresident will file an Oklahoma income tax return which will include in the adjusted gross income of such nonresident that portion of the Oklahoma taxable income of the corporation allocable to the interest of the nonresident in such corporation, or (ii) the corporation has made a valid election pursuant to the provisions of the Pass-Through Entity Tax Equity Act of 2019 and has paid the applicable tax. For purposes of this section, the term "corporation" shall include state-chartered banks, state and federal savings associations and national banking associations that have total assets of Three Billion Dollars ($3,000,000,000.00) or less and that are organized pursuant to the laws of this state, or the United States, or are located or doing business in this state.
Okla. Stat. tit. 68, § 2365