The deadline for filing Texas state taxes is generally aligned with the federal tax deadline, which is typically April 15 each year. However, if April 15 falls on a weekend or a federal holiday, the deadline may be extended to the next business day. It is important for taxpayers to file their returns by this deadline to avoid any penalties or interest on unpaid taxes. Texas does not have a state income tax, but individuals may still be responsible for other taxes such as franchise taxes for businesses. Additionally, it is important to stay informed about any changes or extensions that may apply, especially in special circumstances. For detailed information regarding tax deadlines and other important dates, one can refer to the official website of the Texas Department of Revenue.