When to use a proforma invoice template
A proforma invoice is a commitment document, not a payment request. You send it before work begins to give the client a formal, document-level cost estimate that they can use for budget approval, purchase order issuance, or customs declarations. It looks like a real invoice — same fields, same layout — but the payment terms are replaced with "Quote — not payable" and the document is explicitly labeled as proforma.
Proformas are common in international trade (importers need them for customs clearance before the goods actually ship), in large enterprise deals (procurement teams need a formal document to raise a PO against), and in project-based work where the client wants to see the exact cost breakdown before approving the engagement. Once the client approves the proforma, you convert it into a standard invoice when billing becomes due.