I might take a year off after high school (a gap year). Can I apply now, and if I get accepted, ask the university to defer my acceptance until next year?

University Admission Requirements

Deferral policies vary from university to university. Some universities allow deferrals, while others do not. Some universities may grant a deferral but request that you re-apply after your gap year (and pay all the associated application fees again).

If you are interested in deferring admission, you must contact the universities directly.