The Texas rule is simple to state: child support continues until the child turns 18 or graduates from high school, whichever happens later (Family Code §§154.001–154.002). The details — and one common trap — are what trip people up.
The general rule: 18 or graduation, whichever is later
If a child turns 18 before finishing high school, support doesn't stop on the birthday. As long as the child is enrolled and meeting attendance requirements, the order can continue through the end of the month the child graduates. Conversely, a child who graduates at 17 generally still has support continue until 18.
Events that can end support earlier
- Emancipation — the child marries, or a court removes the disabilities of minority;
- Death of the child;
- Other operation of law in specific circumstances.
The exception: a child with a disability
The trap: it does not stop automatically
This is the single most important thing to know. When a child ages out, wage withholding does not switch off by itself. The paying parent must obtain an order terminating withholding (or contact the Office of the Attorney General) to stop the deductions. Otherwise payments can keep coming out of a paycheck after the obligation has legally ended — recovering those is a hassle.
Note too that reaching the end date ends future support, but it does not erase past-due arrears. Any unpaid balance — plus interest — remains collectible until paid.