There is no deadline for admission. G.I.A.C. will send you a letter of decision as soon as they know of your status. This might be a day before school starts. The quicker you apply, the quicker you will know your status. You need to find your own housing many months before you come to Austin.
Housing fills up very quickly.
Please do not wait until the last minute. U.T. does not have an off-campus housing office. Students must fill-out a departmental application . However, you must still apply with G.I.A.C. before you will be accepted. You may petition for up to 6 hours of graduate coursework from a different university to count towards your U.T. degree.