If your charges are dropped and you paid a bail bondsman a 10% fee for posting the full amount of bail for you, then you do not get that 10% fee returned. The bondsman fee is a service for on an agreement that you will be able to get out of jail until your court date; the bonding company posts the full amount of bail for you, taking the risk on your behalf.

If you paid the court directly, then you should get your full bond money back minus any small court fees.