A proforma invoice is a preliminary, non-binding estimate sent before a sale is finalized, while a commercial invoice is the official, legally binding document that demands payment after goods are shipped or sold. In short: the proforma comes first as a quote, and the commercial invoice comes last as the real bill. Only the commercial invoice is used for customs clearance, accounting, and tax records.
If you sell goods across borders or quote large orders, knowing which document to send—and when—prevents payment delays, customs holds, and bookkeeping headaches.
What Is a Proforma Invoice?
A proforma invoice is a good-faith estimate of what a buyer will owe before the transaction is confirmed. The term "pro forma" is Latin for "as a matter of form."
It looks like a real invoice but carries no demand for payment and creates no accounts-receivable entry. Buyers use it to arrange financing, secure import permits, or approve a purchase internally.
When to use a proforma invoice
- Quoting a custom or large order before the buyer commits
- Helping an international buyer apply for an import license or letter of credit
- Giving a customer a price breakdown to get internal budget approval
- Estimating duties, taxes, and shipping before goods are produced
Because it is preliminary, a proforma invoice can be revised as quantities, prices, or terms change. Learn more about how to create one on our proforma invoice page.
What Is a Commercial Invoice?
A commercial invoice is the definitive record of a completed sale. It is legally binding, requests actual payment, and serves as the primary document customs authorities use to assess duties and taxes on imported goods.
Unlike a proforma, a commercial invoice records a real receivable in your books and cannot be casually edited once issued. It includes finalized quantities, prices, payment terms, and—for cross-border shipments—details like Harmonized System (HS) codes and country of origin.
When to use a commercial invoice
- After goods have shipped or services have been delivered
- For customs clearance on international shipments
- When you need an enforceable demand for payment
- For your official accounting and tax records
This matters at scale: U.S. exports of goods rose $38.6 billion to reach $2,083.8 billion in 2024, according to the U.S. Bureau of Economic Analysis. Every one of those shipments needs an accurate commercial invoice to clear customs.
Proforma Invoice vs Commercial Invoice: Side-by-Side
| Feature | Proforma Invoice | Commercial Invoice |
|---|---|---|
| Purpose | Preliminary quote / estimate | Final demand for payment |
| Legally binding | No | Yes |
| Timing | Before the sale is confirmed | After goods ship or are delivered |
| Used for customs | No (informational only) | Yes (official customs document) |
| Recorded in accounting | No | Yes (accounts receivable) |
| Can be revised | Yes, freely | No, once issued |
| Triggers payment | No | Yes |
Why the Distinction Matters
Sending the wrong document can cost you money and time. Submitting a proforma invoice for customs clearance, for example, will often result in a shipment being held until a valid commercial invoice is provided.
The stakes are highest for small exporters. Small businesses make up 97% of all U.S. exporting firms, per the U.S. Small Business Administration Office of Advocacy—and these are often the businesses with the least margin for customs delays.
Getting the document right also protects your cash flow. 56% of U.S. small businesses are owed money from unpaid invoices, with an average of $17,500 outstanding, according to the 2025 Intuit QuickBooks Small Business Late Payments Report. A clear, properly issued commercial invoice with firm payment terms reduces the ambiguity that fuels late payments.
How the Two Documents Work Together
In a typical international order, both documents play a role at different stages:
- Quote stage — You send a proforma invoice so the buyer can approve the price and arrange payment or import paperwork.
- Confirmation — The buyer accepts the proforma terms and places the order.
- Shipment — You issue the commercial invoice with finalized figures; this travels with the goods and clears customs.
- Records — The commercial invoice goes into your accounting system as a receivable and into your tax records.
Note that neither document is a tax invoice in the formal sense unless it includes the tax details your jurisdiction requires. And neither is a receipt—a receipt confirms payment was received, while an invoice requests it. If those terms blur together for you, our guide to invoice vs receipt vs quote breaks down each one.
Common Mistakes to Avoid
- Treating a proforma as a final bill. It is an estimate; the buyer is under no obligation to pay it.
- Using a proforma for customs. Customs authorities require a commercial invoice for valuation.
- Forgetting required customs fields. Commercial invoices for international shipments need HS codes, country of origin, and accurate declared values.
- Editing a commercial invoice after issuance. Issue a credit note or corrected invoice instead, to keep an audit trail.
Frequently Asked Questions
Is a proforma invoice legally binding?
No. A proforma invoice is a preliminary estimate, not a binding contract or a demand for payment. It can be revised before the sale is confirmed. The legally binding document is the commercial invoice, which is issued once the transaction is finalized and the goods ship.
Can I use a proforma invoice for customs clearance?
Generally no. Customs authorities require a commercial invoice to assess duties and taxes, because it reflects the final, actual transaction value. A proforma may accompany goods for informational purposes, but it cannot replace the commercial invoice for official clearance and can cause shipment delays.
Does a proforma invoice get recorded in accounting?
No. Because a proforma invoice does not represent a completed sale, it should not be entered as accounts receivable or revenue. Only the commercial invoice creates an accounting entry. Recording a proforma as a sale would overstate your income and distort your financial records.
What information must a commercial invoice include?
A commercial invoice should list the seller and buyer, a description and quantity of goods, unit and total prices, payment and delivery terms, and the currency. For international shipments, add HS codes, country of origin, and the declared value used for customs duty assessment.
The Bottom Line
Use a proforma invoice to quote and confirm a sale before it happens, and a commercial invoice to demand payment and clear customs after goods ship. The proforma is flexible and informational; the commercial invoice is final, binding, and official.
Ready to create either one? Start with a free proforma invoice template and generate a professional document in minutes.