There’s a couple ways you could handle this; however, within this system the simplest way would be to open up the tenant’s accounting screen (Tenants / Click their current balance). Then open up the Deposit window by clicking on their deposit balance. Receive a deposit, and note the description that this is for the final months rent. This will then add the amount to the deposit tracking window so you can easily track it. When it is time to apply the last months rent back to the tenant; open up the same window select ‘Apply Deposit as Tenant Credit’, and enter the amount, and description as ‘last months rent’.