Okla. Const. art. X, § 5

Surrender of power of taxation - Uniformity of taxes. A. Except as otherwise provided by this section, the power of taxation shall never be surrendered, suspended, or contracted away. B. Taxes shall be uniform upon the same class of subjects. C. The Legislature is hereby authorized to enact laws providing for the abatement of tax assessments, or portions thereof, if: 1. Collection of the tax liability and interest and penalties accruing thereto would reasonably result in the taxpayer declaring bankruptcy; 2. The tax is uncollectible due to insolvency of the taxpayer resulting from factors beyond control of the taxpayer or for other similar cause beyond the control of the taxpayer; 3. The tax liability is attributable to actions of a person other than the taxpayer and it would be inequitable to hold the taxpayer liable for the tax liability; or 4. In cases of nonpayment of trust fund taxes, the taxes were not collected by the taxpayer from its customer and the taxpayer had a good faith belief that collection of the taxes was not required. Amended by State Question No. 702, Legislative Referendum No. 327, adopted at General Election held Nov. 5, 2002.