Tex. Tax Code § 323.201 — COMPUTATION OF SALES TAXES

(a) Each retailer in a county that has adopted the tax authorized by this chapter shall add the sales tax imposed by this chapter and by Chapter 151 , plus any other applicable sales tax, to the sales price, and the sum of the taxes is a part of the price, a debt of the purchaser to the retailer until paid, and recoverable at law in the same manner as the purchase price. (b) The amount of the total tax is computed by multiplying the combined applicable tax rates by the amount of the sales price. If the product results in a fraction of a cent less than one-half of one cent, the fraction of a cent is not collected. If the fraction of a cent is one-half of one cent or more, the fraction shall be collected as one cent. Added by Acts 1987, 70th Leg., ch. 191, Sec. 1, eff. Sept. 1, 1987.