Texas Government Code - GOV'T § 572.029. Timeliness of Filing

(a) The deadline for filing a financial statement required by this subchapter is 5 p.m. of the last day designated in the applicable provision for filing the statement.

(b) If the last day for filing the financial statement is a Saturday, Sunday, or holiday included under Subchapter B, Chapter 662,  1 the statement is timely if filed on the next day that is not a Saturday, Sunday, or listed holiday.

(c) A financial statement is timely filed if it is properly addressed and placed in the United States Post Office or in the hands of a common or contract carrier not later than the last day for filing the financial statement. The post office cancellation mark or the receipt mark of a common or contract carrier is prima facie evidence of the date the statement was deposited with the post office or carrier. The individual filing the statement may show by competent evidence that the actual date of posting was different from that shown by the marks.