Tex. Property Code § 116.174

(a) To the extent that a trustee accounts for receipts from an interest in minerals or other natural resources pursuant to this section, the trustee shall allocate them as follows:

(1) If received as delay rental or annual rent on a lease, a receipt must be allocated to income.

(2) If received from a production payment, a receipt must be allocated to income if and to the extent that the agreement creating the production payment provides a factor for interest or its equivalent. The balance must be allocated to principal.

(3) If received as a royalty, shut-in-well payment, take-or-pay payment, or bonus, the trustee shall allocate the receipt equitably.

(4) If an amount is received from a working interest or any other interest not provided for in Subdivision (1), (2), or (3), the trustee must allocate the receipt equitably.

(b) An amount received on account of an interest in water that is renewable must be allocated to income. If the water is not renewable, the trustee must allocate the receipt equitably.

(c) This chapter applies whether or not a decedent or donor was extracting minerals, water, or other natural resources before the interest became subject to the trust.

(d) The trustee may allocate a receipt from any interest in minerals, water, or other natural resources the trust owns on January 1, 2004, in the manner provided by this chapter or in any lawful manner used by the trustee before January 1, 2004, to make the same allocation. The trustee shall allocate a receipt from any interest in minerals, water, or other natural resources acquired by the trust after January 1, 2004, in the manner provided by this chapter.

(e) An allocation of a receipt under this section is presumed to be equitable if the amount allocated to principal is equal to the amount allowed by the Internal Revenue Code of 1986 as a deduction for depletion of the interest.