Okla. Stat. tit. 68 § 1407.1
Any taxes paid by vendors pursuant to Sections 1406 and 1407 of Title 68 of the Oklahoma Statutes on gross receipts represented by accounts receivable which, on or after December 31, 1990, are found to be worthless or uncollectible and that are eligible to be claimed if the taxpayer kept accounts on a cash basis or could be eligible to be claimed if the taxpayer kept accounts on an accrual basis, as a deduction pursuant to Section 166 of the Internal Revenue Code, or the unpaid portion of any account at the time repossession is accomplished under the terms of a conditional sales contract, may be credited upon subsequent reports and remittances of the tax levied in this article, in accordance with the rules and regulations of the Tax Commission. If such accounts are thereafter collected, the same shall be reported and the tax shall be paid upon the amount so collected.
Okla. Stat. tit. 68, § 1407.1