Tex. Tax Code § 152.062

(a) The persons obligated by this chapter to pay taxes on the transaction shall file a joint statement with the tax assessor-collector of the county in which the application for registration and for a Texas certificate of title is made.

(b) The statement must be in the following form:

(1) if a motor vehicle is sold, the seller and purchaser shall make a joint statement of the then value in dollars of the total consideration for the vehicle;

(2) if the ownership of a motor vehicle is transferred as the result of an even exchange, the principal parties shall make a joint statement describing the nature of the transaction; or

(3) if the ownership of a motor vehicle is transferred as the result of a gift, the principal parties shall make a joint statement describing the nature of the transaction and the relationship between the principal parties.

(b-1) A joint statement required by Subsection (b)(3) must be notarized.

(b-2) A joint statement required by Subsection (b)(3) that relates to a gift from a person described by Section 152.025(a)(1) must be filed in person by the recipient of the gift or, as applicable, the person from whom the gift is received. A motor vehicle title service required to be licensed under Chapter 520, Transportation Code, may not be used to file the statement. The person who files the statement must present to the tax assessor-collector an unexpired identification document issued to the person that bears the person's photograph and is:

(1) a driver's license or personal identification card issued by this state or another state of the United States;

(2) an original United States passport or an original passport issued by a foreign country;

(3) an identification card or similar form of identification issued by the Texas Department of Criminal Justice;

(4) a United States military identification card; or

(5) an identification card or document issued by the United States Department of Homeland Security or United States Citizenship and Immigration Services.

(c) If a party to a sale, even exchange, or gift is a corporation, the president, vice-president, secretary, manager, or other authorized officer of the corporation shall make the statement for the corporation.

(d) A seller of a motor vehicle is not required to complete a joint statement described by this section if:

(1) the seller does not hold a general distinguishing number issued under Chapter 503, Transportation Code; and

(2) the seller has complied with Section 501.028 or 501.072, Transportation Code, as applicable.

(e) The tax assessor-collector shall examine each joint statement for the purpose of determining the truth and accuracy of the information it contains. If the tax assessor-collector or the comptroller has reason to question the truth of the information in a statement, or if any material fact fails to meet the guidelines promulgated by the comptroller, the tax assessor-collector or the comptroller shall require any party to the statement to furnish substantiation of information contained in the statement.

(f) The tax assessor-collector shall immediately report to the nearest peace officer and to the comptroller, the name and address of each party whose name is signed on a joint statement found to be false in any material fact.

(g) The tax assessor-collector shall keep a copy of each statement and any substantiating materials required to be furnished in connection therewith until it is called for by the comptroller for auditing or by any court of competent jurisdiction.