A buyer accepts your PI, then reduces the quantity before dispatch. Which document should show the original offer, and which should show the goods actually supplied? That is the practical difference between a commercial invoice and a proforma invoice.
This comparison concentrates on choosing the right document and explaining differences between them. For a step-by-step preparation guide, use Wedrang’s existing proforma invoice for export article. There is no single invoice format that satisfies every country, contract and bank.
Commercial invoice vs proforma invoice at a glance
| Question | Proforma invoice | Commercial invoice |
|---|---|---|
| Primary purpose | Present an offer or proposed transaction | Record the actual transaction information used for the shipment |
| Usual stage | During negotiation or pre-shipment arrangements | Prepared for the actual supply and clearance process |
| Quantities | Proposed or agreed order quantities | Actual invoiced shipment quantities |
| Prices and charges | Quoted prices and stated assumptions | Final applicable prices and charges |
| Document reference | PI reference and revision as appropriate | Commercial invoice reference under the seller’s records |
| Customs role | Not automatically a substitute for the shipment invoice | Key transaction document used for export/import clearance |
| Payment role | Can support an advance-payment request or banking application | Supports settlement according to the agreed payment terms |
| What it does not prove | That goods shipped or funds arrived | That the buyer paid or the goods met every quality requirement |
The distinction is about function, not how polished the document looks. A quotation with a logo and invoice-style table is still a proposal if that is what it represents. A commercial invoice must reflect the transaction accurately rather than preserve figures that are no longer true.
What stays the same, and what must be checked again?
The parties, product references, currency and agreed delivery term may carry forward from the PI. That makes the earlier document useful as a starting point. It does not remove the need to verify the final records.
Compare the final purchase instruction, approved changes, packing records and price agreement. Separate an intentional amendment from a typing error. If the buyer changes the consignee, establish the relationship and documentary implications before repeating the new details across the file.
Classification also deserves attention. A product code copied from a previous order may no longer fit a modified product. Wedrang’s HS code guide explains the product facts and national checks involved.
Illustrative example: the shipment changes after the PI
Illustrative example: A seller quotes 500 units at US$12 each on a PI, giving a goods subtotal of US$6,000. Before dispatch, the buyer agrees to take 450 units instead, at the same unit price. The actual goods subtotal becomes US$5,400.
Assume an agreed packaging charge of US$100 applies in both versions. The PI total is US$6,100, while the commercial invoice total for this shipment is US$5,500. These are invented teaching figures, not prices from a supplier.
| Field | Original PI | Actual shipment invoice |
|---|---|---|
| Quantity | 500 units | 450 units |
| Unit price | US$12 | US$12 |
| Goods subtotal | US$6,000 | US$5,400 |
| Agreed packaging charge | US$100 | US$100 |
| Transaction total in this example | US$6,100 | US$5,500 |
| Supporting record | Original proposal | Buyer-approved quantity change and final supply details |
Keep the original PI and the approval of the reduction. The explanation should be available to the buyer, accounts team and relevant service providers. Matching the old total by inventing a balancing line would create a less accurate record, not a better match.
Does the commercial invoice have to match the PI exactly?
Not if the transaction legitimately changed. It should match what was actually agreed and supplied, with a traceable explanation for differences. Investigate unexplained changes in price, quantity, currency or business identity.
A documentary letter of credit creates an additional check. The invoice and other presented documents must meet the issued credit and applicable rules. A buyer’s informal approval of a changed quantity does not automatically amend the bank’s requirements.
If payment uses that method, read the letter of credit guide and consult your bank before shipping under terms you cannot meet. Check whether a formal amendment is needed rather than assuming the PI controls the banking transaction.
How should an advance payment appear in your records?
A PI may support an advance-payment request. It does not prove the money arrived. Verify receipt through your normal banking controls and link the payment to the correct order.
Keep transaction value and outstanding balance distinct. An advance can reduce the amount still payable without reducing the value of the goods sold. Show the payment allocation clearly using an approach appropriate to your accounting and customs requirements.
Illustrative continuation: If US$1,500 was received against the US$5,500 example shipment, the unpaid balance is US$4,000, assuming no other adjustments. That arithmetic is not an instruction to declare only US$4,000 as the shipment’s customs value.
Customs valuation can require its own adjustments and evidence. Ask the responsible adviser how freight, insurance, assists, discounts or other items are treated for the transaction. Do not equate an unpaid balance with the declared value.
Can a proforma invoice be used for customs?
For an ordinary completed sale, prepare the commercial invoice and other required shipment documents. Do not assume the earlier sales PI is enough simply because it contains similar fields.
Equally, avoid saying that customs can never accept any document called a proforma invoice. For example, US rules in 19 CFR 141.85 describe a pro forma statement of value submitted under the relevant provisions when the commercial seller’s or shipper’s invoice is unavailable.
That procedure is not blanket permission to replace a commercial invoice with any quotation. Confirm the applicable basis, contents and obligations with the customs adviser. Other jurisdictions and non-sale movements may have different rules.
Is either document proof of payment or a tax invoice?
Neither title, by itself, proves payment. A commercial invoice may remain unpaid, partly paid or fully settled. Use genuine banking and accounting records to establish the payment position.
Do not treat the words commercial invoice as automatic proof of compliance with every domestic tax-invoice requirement. Tax documents depend on the relevant jurisdiction and transaction. UK HMRC guidance, for example, distinguishes a proforma document from the primary invoicing function in its own VAT context; that is not an Indian GST rule.
Keep these questions separate: what was proposed, what was supplied, what is payable, what has been paid and what tax or customs records are required?
How to prevent version confusion
Give each document a clear identity
Use an unambiguous title, reference and date. Mark PI revisions so the buyer can identify the accepted offer. Keep the commercial invoice reference linked to the order without pretending the documents have identical purposes.
Reconcile before final issue
Have the documentation team compare the final invoice with actual supply and approved changes. Check extensions, totals, currency, units and charges. A second review is useful where the value or complexity justifies it.
Control corrections after issue
If a final document is wrong, follow the relevant correction process and notify affected parties. A silent replacement can leave customs, the bank and the buyer using different versions. Retain the audit trail rather than deleting the history.
Frequently asked questions
Which document comes first?
A PI commonly comes first as a proposal. The commercial invoice records the actual transaction later in the process. Individual workflows and legal requirements can differ.
Can I just rename the PI?
Only after verifying and completing the actual transaction details. Changing the heading alone is not a meaningful reconciliation.
Is a PI always legally non-binding?
Do not rely on that universal claim. Legal effects can depend on the wording, acceptance, surrounding agreement and applicable law.
What about samples sent without a sale?
Ask what declaration and value evidence the destination requires. No sale does not automatically mean no customs value or no paperwork.
When comparing delivery charges between the proposal and final invoice, use the Incoterms delivery-terms guide. The agreed rule helps explain the cost allocation, but it does not decide payment timing or customs valuation.
Sources and scope
Checked 17 October 2026: US International Trade Administration, Pro Forma Invoice, Commercial Invoice and Common Export Documents; eCFR, 19 CFR 141.85—Pro forma invoice; HMRC, VAT Traders’ Records Manual VATREC9010. Country-specific examples explain why a universal rule can mislead; they are not a complete customs or tax procedure.
Editorial disclosure: This guide was drafted with AI assistance using the primary sources listed here. No named human author, expert review or firsthand transaction experience is claimed. Confirm the requirements for your shipment with the relevant carrier, bank, customs adviser or other qualified professional.