Invoicing · Updated 2026-10-06

Proforma vs Commercial Invoice: What's the Difference?

Freelancers encounter two documents with confusingly similar names: the proforma invoice and the commercial invoice. They look alike, share most of the same fields, and both have the word "invoice" in the title — but they do completely different jobs, and mixing them up can cause real problems, from tax headaches to customs seizures. This guide explains each one, compares them side by side, and shows you when to use which.

If you just need the basics of the proforma itself, our what is a proforma invoice guide covers it in depth.

What a proforma invoice is

A proforma invoice is a preliminary bill — a good-faith estimate of what a transaction will cost, sent before the work is done or the goods are shipped. "Proforma" literally means "as a matter of form": it has the form of an invoice without being one.

Freelancers use proformas to:

• Give a client a formal, detailed price breakdown before work begins
• Help a client raise a purchase order or get internal budget approval
• Declare the value of goods for international customs (very common in shipping)
• Request a deposit or advance payment against agreed terms

The critical point: a proforma invoice is not a demand for payment and not a tax document. You don't record it as income, your client doesn't record it as an expense, and it creates no VAT/GST obligations. It's a formalised quote with invoice-like formatting.

What a commercial invoice is

A commercial invoice (often just called an "invoice") is the real thing: a formal demand for payment issued after the work is done or goods are delivered. It creates an accounts-receivable for you and an accounts-payable for your client, it's recorded in both parties' books, and — where applicable — it triggers VAT/GST/sales tax obligations.

Everything else on this site about invoices refers to commercial invoices: the complete guide to writing one, numbering, payment terms, and chasing.

Side-by-side comparison

| | Proforma invoice | Commercial invoice | |---|---|---| | Purpose | Estimate / declaration of intent | Demand for payment | | When issued | Before work or shipment | After delivery / completion | | Legally binding | No — it's a quote in invoice clothing | Yes — it's a payment obligation | | Recorded in accounts | No | Yes, by both parties | | Tax treatment | No VAT/GST due | VAT/GST applies where relevant | | Can demand payment? | Only a deposit/advance if agreed | Yes — the full amount | | Numbering | Separate sequence recommended | Sequential, gap-free | | Used in customs | Yes — to declare shipment value | Sometimes, for the actual sale |

When to use each

Use a proforma when:

• A client needs a formal document to approve budget or raise a PO before you'll start
• You're requesting an advance or deposit and want it documented properly
• You're shipping goods internationally and customs needs a declared value (the proforma travels with the shipment; the commercial invoice follows the sale)
• The final price depends on variables and you want to lock in the estimate in writing

Use a commercial invoice when:

• The work is done or the goods are delivered and you want to be paid — this is the default
• You need a tax document for VAT/GST purposes
• You're recording revenue in your accounts

The normal lifecycle for a project that uses both: quote/proforma → client approval (and possibly deposit) → work → commercial invoice → payment → receipt. Our quote generator produces the "before" document; our invoice generator produces the "after" one.

What goes on a proforma invoice

A good proforma mirrors the eventual commercial invoice so the client can approve exactly what they'll later be billed. Include:

• The words "PROFORMA INVOICE" prominently at the top — never let it be mistaken for the real thing
• Your details and the client's details, as on any invoice
• A reference number from your separate proforma sequence (PRO-001, not INV-001)
• The date of issue and the period the estimate covers
• Itemised lines with descriptions, quantities, and rates — as detailed as the final invoice will be
• Subtotal, any applicable tax shown as estimated, and the estimated total
• A validity note: "This proforma is valid for 30 days and does not constitute a tax invoice." Estimates go stale; put an expiry on yours.

For international shipments, customs authorities may also want the country of origin, a description of the goods sufficient for classification, and the reason for export. Check the destination country's requirements — a proforma rejected at customs delays the whole shipment.

Proformas in international trade

This is where proformas are most deeply embedded. When goods cross borders, customs needs to know what a shipment is worth before it arrives — but the commercial invoice (the actual sale document) often isn't finalised until delivery terms settle. The proforma fills the gap: it travels with or ahead of the goods, declaring value for duty assessment.

Important nuances: customs values the goods, not your invoice type — understating value on a proforma to dodge duty is fraud, not cleverness. And in some countries, the commercial invoice must eventually match the proforma within tolerance, or you'll face questions. If you ship internationally regularly, align your proforma and commercial invoice processes so the numbers reconcile cleanly.

5 mistakes people make with proformas

1. Treating a proforma as a tax invoice. Recording proforma amounts as income (or reclaiming VAT from one) is wrong and can trigger penalties. Only commercial invoices touch your tax position.

2. Using one numbering sequence for both. If proformas and invoices share numbers, your books become a mess and auditors get suspicious. Run separate sequences (e.g., PRO-001 and INV-001).

3. Sending a proforma when you meant to demand payment. A client receiving a proforma hears "this is an estimate," not "pay me now." If the work is done, send the commercial invoice — the proforma's job is over.

4. Vague proformas. A proforma with "services — $5,000" gives the client nothing to approve. Itemise it exactly as you would the final invoice, so the commercial invoice later matches what was approved.

5. Forgetting the label. Always title the document clearly: "PROFORMA INVOICE" in large type, plus a line like "This is not a tax invoice." Ambiguity here causes exactly the confusion this guide exists to prevent.