...
If you foresee issues making the tuition payment deadline (including problems getting financial aid applied), UT suggests taking out a UT tuition loan in order to pay on time as the interest rate of the loan is often considerably less than late registration fees.
...
Graduate students may drop a class through the last class day of a semester, and the instructor will assign a symbol of Q (Quit) or F (Fail). The form you need to late-drop a class can be obtained from the Graduate Coordinator. Because the form requires the signatures of the Graduate Adviser, it is best to decide to drop a course prior to the last week of classes.
More information about Add/Drop deadlines and policies via the Graduate School.
Continuous Registration
All students are expected to register and pay tuition and fees by the appropriate deadlines until graduation (this continuous registration rule does not apply to summer sessions).
...