(From the Faculty of Arts and Science website: http://www.artsci.utoronto.ca/current/course/timetable/20135/dates
)Summer 2013 Registration Payment or Deferral Deadline:
Registration will occur automatically if you pay at least the minimum first installment of your fees (or officially defer them) by April 25. If your payment has not been received or officially deferred by April 25, you will be removed from your courses at any time. We will allow a processing time of 10 days for bank payments to be received by the University before removing you from courses. Note that reinstatement in courses is not guaranteed as spaces may be filled. If you wish to register after you have been removed, you will be charged a late registration fee.