Tex. Tax Code § 152.123
(a) The county tax assessor-collector each calendar year shall calculate five percent of the tax and penalties collected by the county tax assessor-collector under this chapter in the preceding calendar year. In addition, the county tax assessor-collector shall calculate each calendar year an amount equal to five percent of the tax and penalties that the comptroller:
(b) The county shall retain the following percentage of the amounts calculated under Subsection (a) during each of the following fiscal years:
Added by Acts 2003, 78th Leg., ch. 1325, Sec. 9.01, eff. Sept. 1, 2005.