Okla. Stat. tit. 60, § 60-175.405: Rental property

RENTAL PROPERTY

To the extent that a trustee accounts for receipts from rental

property pursuant to this section, the trustee shall allocate to

income an amount received as rent of real or personal property,

including an amount received for cancellation or renewal of a lease.

An amount received as a refundable deposit, including a security

deposit or a deposit that is to be applied as rent for future

periods, must be added to principal and held subject to the terms of

the lease and is not available for distribution to a beneficiary

until the trustee's contractual obligations have been satisfied with

respect to that amount.