Estimates to invoices lets you quote a rental the same way you'd advance a show, then turn that quote into an invoice the moment the renter signs. No separate document, no retyping line items, no gap between the deal you made and the bill you send.

Rentals move fast and terms change up until the signature. Building the invoice straight from the signed estimate keeps the numbers you quoted and the numbers you collect on in sync, so accounts receivable reflects what was actually agreed, not a reconstruction of it.