We just bill the client one fee — half at the start and half at the end. How would it be billed?
You’d add an “estimate billing” invoice and choose to bill 50% of the estimate. The invoice will calculate half of each of the task’s billing amounts. At the end of the job, you can bill the other half of the estimate and choose to include change orders if you need to. (If you don’t want the estimate billing to appear as income on your financials, add it as an “advance billing” instead. The advance billing credits a liability account instead of income, then is applied later to the job’s final billing as a payment).