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Proforma Invoice vs. Commercial Invoice

A proforma invoice is a preliminary document — it shows what a deal would look like. A commercial invoice is the real thing: the final bill used to demand payment and clear goods through customs. Confuse them and shipments stall.

What a proforma invoice actually is

A proforma invoice looks like an invoice but isn't one. It outlines the goods or services, quantities, and prices for a deal that hasn't closed yet. Sellers use it to give buyers something concrete to approve, budget for, or take to their bank — before anyone commits.

Common uses: a buyer needs internal approval for a purchase, an importer needs a document to arrange financing or an import license, or two sides want to confirm the terms in writing before signing a contract. The proforma says "here's what we'd agree to" without creating a debt.

Because of that, a proforma invoice is not a demand for payment and generally can't be used for customs clearance. Mark it clearly: "PROFORMA INVOICE — NOT A TAX INVOICE" at the top. If it looks exactly like a real invoice, someone downstream will treat it like one.

Proformas also help both sides sanity-check the details before money is involved: quantities, unit prices, shipping terms, and totals all get reviewed while changes are still cheap. Catching a pricing error on a proforma costs an email; catching it on a commercial invoice costs a credit note and an awkward conversation.

What a commercial invoice does

The commercial invoice is the final, official bill. It records the actual sale — what was shipped or delivered, the agreed prices, and the amount the buyer must pay. It's the document customs authorities use to assess duties and taxes, and it's the document the buyer's accounts team pays against.

For international shipments, the commercial invoice carries extra weight: it must describe the goods accurately, state the country of origin, and declare the value customs will tax. Errors here mean delays at the border, fines, or seized goods.

Unlike the proforma, the commercial invoice creates a receivable. The moment you issue it, the buyer owes you the stated amount under the stated terms. Number it in your real invoice sequence — the proforma should never consume a number from that sequence.

Side-by-side comparison

	Proforma invoice	Commercial invoice
When to use	Before the deal closes — to outline terms	After delivery — to bill and clear customs
Who sends it	The seller	The seller
Is it binding	No — preliminary, not a payment demand	Yes — a formal bill and customs document
When payment happens	No payment due	Due per the payment terms

The simplest test: if the buyer could pay against it, it's commercial. If paying against it would be premature or impossible, it's proforma.

The typical workflow, in order

For an international sale, the sequence usually runs: quote, then proforma invoice for the buyer's approval and financing, then the contract or purchase order, then shipment, then the commercial invoice. The proforma and the commercial invoice should mirror each other — same goods, same prices — so nothing changes between "what we discussed" and "what you're paying."

Keep the numbering separate and the labeling unmistakable. A proforma marked "PI-014" can never be mistaken for invoice "INV-014" in your books or the buyer's. And never issue a commercial invoice before the goods ship or the service is delivered — backdating creates a paper trail that falls apart under scrutiny.

One last discipline: when the commercial invoice goes out, retire the proforma explicitly. Tell the buyer "proforma PI-014 is now superseded by commercial invoice INV-031." Two live documents for one deal is how duplicate payments and double-counted revenue happen.

For domestic freelancers and service businesses, you may never need a proforma — a quote usually does the same job. But the moment goods cross a border, the proforma/commercial distinction becomes mandatory, not optional.