Overview
If you collected a last month's rent deposit when the tenant moved in, you can apply it to the final rent charge once the last month of the lease arrives. This works the same way as withholding any other lease deposit — follow Withhold a Deposit Held on a Lease for the full steps.
Note: Make sure there's an open charge on the lease before withholding the deposit — this is what the deposit will be applied to. While this is typically used for the final rent charge, you can technically use it to apply the last month's rent deposit to any open charge you want.
Tip: You can also withhold deposits as part of the Ending a Lease wizard!