Tex. Tax Code § 151.023 — INVESTIGATIONS AND AUDITS

(a) The comptroller, or another person authorized by the comptroller in writing, may examine, copy, and photograph the books, records, papers, and equipment of a person who sells taxable items or of a person liable for the use tax and may investigate the character of the business of the person to verify the accuracy of the person's report or to determine the amount of tax that may be required to be paid if no report has been filed. (b) For the purpose of determining the amount of tax collected and payable to the state, the amount of tax accruing and due, and whether a tax liability has been incurred under this chapter, the comptroller or a person authorized by the comptroller may: (1) inspect at any time during business hours any business premises where a taxable event has occurred and examine, copy, and photograph the books, returns, records, papers, and equipment relating to the conduct in question; and (2) require by delivery of written notice to the taxpayer or to an employee, representative, or agent of the taxpayer that, not later than the 10th working day after the date the notice is delivered, the taxpayer produce to an agent or designated representative of the comptroller for inspection the books, records, papers, and returns relating to the taxable activity stated in the notice. Acts 1981, 67th Leg., p. 1548, ch. 389, Sec. 1, eff. Jan. 1, 1982. Amended by Acts 2001, 77th Leg., ch. 442, Sec. 9, eff. Sept. 1, 2001.