Oklahoma constitution
Article X: revenue and taxation
Section 5

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.