If you don’t know what your FAFSA pin is, you should - your fafsa pin number is the key to re-applying each year for Federal aid online, as well as giving you a complete history of your records with the U.S. Department of education online. Not only that, but your pin number often is used in lieu of your signature when agreeing to terms and agreements relating to your student loans online. In fact, the DOE actually devotes an entire website just to the FAFSA pin. The point is this little number is important - so get yours here.