Okla. Stat. tit. 60, § 60-175.503: Transfers from income to principal for depreciation

TRANSFERS FROM INCOME TO PRINCIPAL FOR DEPRECIATION

A. In this section, "depreciation" means a reduction in value

due to wear, tear, decay, corrosion, or gradual obsolescence of a

fixed asset having a useful life of more than one (1) year.

B. A trustee may transfer to principal a reasonable amount of

the net cash receipts from a principal asset that is subject to

depreciation, but may not transfer any amount for depreciation:

1. Of that portion of real property used or available for use

by a beneficiary as a residence or of tangible personal property

held or made available for the personal use or enjoyment of a

beneficiary;

2. During the administration of a decedent's estate; or

3. Under this section if the trustee is accounting under

Section 12 of this act for the business or activity in which the

asset is used.

C. An amount transferred to principal need not be held as a

separate fund.