Okla. Stat. tit. 14A, § 14A-3-204: Deferral charges

(1) With respect to any consumer loan, refinancing, or

consolidation, the parties before or after default may agree in

writing to a deferral of all or part of one or more unpaid

installments.

(2) With respect to a consumer loan, refinancing, or

consolidation, which is not precomputed, at the time of deferral the

debtor may agree in writing to a deferral charge that the lender may

make and collect.

(3) With respect to a precomputed consumer loan, refinancing,

or consolidation, the lender may make and collect a charge not

exceeding the rate previously stated to the debtor pursuant to the

provisions on disclosure (Part 3) applied to the amount or amounts

deferred for the period of deferral calculated without regard to

difference in the lengths of months, but proportionally for a part

of a month, counting each day as one-thirtieth (1/30) of a month.

(4) A deferral charge may be collected at the time it is

assessed or at any time thereafter.

(5) The lender may, in addition to the deferral charge, make

appropriate additional charges (Section 3-202). The amount of these

additional charges which is not paid in cash may be added to the

amount financed. With respect to a precomputed consumer loan,

refinancing, or consolidation, these additional charges not paid in

cash may be considered part of the amount deferred for the purpose

of calculating the deferral charge.

(6) The parties may agree in writing at the time of a

precomputed consumer loan, refinancing, or consolidation that if an

installment is not paid within ten (10) days after its due date, the

lender may unilaterally grant a deferral and make charges as

provided in subsection (3) of this section.

(7) No deferral charge may be made for a period after the date

that the lender elects to accelerate the maturity of the agreement,

except in circumstances where the lender waives the acceleration and

the parties then mutually agree to a deferral.

(8) With respect to a precomputed consumer loan, refinancing,

or consolidation, a delinquency charge made by the lender on an

installment may not be retained if a deferral charge is made

pursuant to this section with respect to the period of delinquency.