Tex. Est. Code § 310.006

Except as required by Sections 2055 and 2056, Internal Revenue Code of 1986 (26 U.S.C. Sections 2055 and 2056), the frequency and method of determining the distributees' respective interests in the undistributed assets of an estate are in the sole and absolute discretion of the executor of the estate. The executor may consider all relevant factors, including administrative convenience and expense and the interests of the various distributees of the estate, to reach a fair and equitable result among distributees.