When is FAFSA deadline? The good news is that FAFSA has three deadlines. But the rule is the earlier you file, the more grant you are likely to receive.Student need to submit your FAFSA application before the federal, state, and school deadline (no matter which one comes first). In fact, students should try to submit the FAFSA long before any deadlines. That would be your smartest move because many types of financial aid are limited.