Okla. Admin. Code § 365:10-9-15
(c) Individual variable annuity contract provisions. No individual variable annuity contract calling for the payment of periodic stipulated payments to the insurer shall be delivered or issued for delivery in this state unless it contains in substance the following provision, or provisions which, in the opinion of the Commissioner, are more favorable to the holders of such contracts:
(d) Investment increment factor. Any individual variable annuity contract delivered or issued for delivery in this state shall stipulate the investment increment factor to be used in computing the dollar amount of variable benefits or other contractual payments or values thereunder, and may guarantee that expense and/or mortality results shall not adversely affect such dollar amounts. If not guaranteed, the expense and mortality factors shall also be stipulated in the contract.
(1) In computing the dollar amount of variable benefits or other contractual payments or values under an individual variable annuity contract: