Tex. Gov't Code § 316.009

The governor may prepare a general appropriation bill and submit printed copies of it to the lieutenant governor, speaker of the house of representatives, and each member of the legislature. The bill must be submitted not later than the 30th day of the legislature's regular session, except that if a person is inaugurated as governor who was not governor preceding the inauguration, the bill must be submitted not later than the 20th day after the date of that inauguration.