Question regards project accounting, we take payment in advance for a batch of hours and currently manually reconcile when they are used and then start ticking "billable" on future time. My preference would be to be able to mark all time as billable and then run an invoice each month which draws down on the "deposited" service cost we had already received. We cannot do this (as far as I know) as a "Deposit" due to UK VAT accounting rules. Does anybody have any suggestions?