Proforma vs Commercial Invoice: What's the Difference and When to Use Each

TL;DR: A proforma invoice is a preliminary quote — non-binding, used for pre-payment, customs pre-clearance, and quote-to-order workflows. A commercial invoice is the final demand for payment — legally binding, used for B2B billing, tax records, and customs valuation at import. They look similar but serve different stages of the sale.

If you've ever sold internationally, run a B2B sales cycle that requires upfront approval, or shipped goods through customs, you've likely needed both. They look almost identical on paper — same buyer, same seller, same line items — but their legal and accounting role is completely different.

This guide explains the practical difference, when each applies, and how to avoid the common mistake of conflating the two.

What Is a Proforma Invoice?

A proforma invoice is a preliminary document issued before a sale is finalized. It tells the buyer:

• What goods or services you propose to sell
• At what prices, including any taxes and shipping
• Under what terms (Incoterms, payment, validity)

It is not a demand for payment and not a tax document. The buyer cannot use it to claim VAT credits or expense the goods. The seller cannot use it as evidence of revenue.

You can create one in a couple of minutes using a proforma invoice creator — the template handles the labeling, validity period, and Incoterms fields for you.

Typical use cases for proforma invoices

• Quoting a sale before the buyer commits. The proforma describes the deal precisely so both sides know what they're agreeing to.
• Customs pre-clearance for international shipments. Customs authorities accept proformas for advance ruling, sample shipments, and pre-arrival review.
• Bank financing — a proforma lets the buyer's bank arrange a letter of credit, foreign-exchange forward, or working-capital line before goods ship.
• Internal approval routing — large B2B buyers route the proforma through procurement, finance, and legal before issuing a purchase order.
• Deposit collection — many service businesses issue a proforma to collect a 30–50% deposit before starting work, then issue the commercial invoice on completion.

What Is a Commercial Invoice?

A commercial invoice is the final, legally binding document that requests payment for goods or services already delivered (or about to ship). It is:

• An accounting record for both parties
• A tax document — the basis for VAT/GST credits, expense deduction, and revenue recognition
• A legal demand for payment, enforceable under contract and commercial law
• For international shipments, the document customs uses to assess duty and import tax

Once you issue a commercial invoice, you have made a formal claim — the buyer owes the amount stated under the agreed terms.

You can generate a commercial invoice using our free invoice creator for any currency or jurisdiction, or use one of our country-specific creators: UK, Australia, India, Canada, Singapore, Ireland, New Zealand, or South Africa.

The Critical Differences at a Glance

| Aspect | Proforma invoice | Commercial invoice | |---|---|---| | Stage of sale | Before sale is final | After sale is agreed | | Legal status | Non-binding quote | Binding demand for payment | | Tax document? | No — buyer cannot claim VAT | Yes — buyer can claim input VAT | | Accounting | Not posted as revenue | Posted as revenue/payable | | Customs use | Pre-clearance, samples, advance ruling | Duty assessment at import | | Numbering | Separate proforma series (e.g. PRO-001) | Sequential commercial series (e.g. INV-001) | | Validity | Time-limited (typically 30–90 days) | Open until paid | | Replaced by | A commercial invoice once the deal closes | A credit note if cancelled or refunded |

When Do You Use Each?

Use a proforma invoice when:

• A client asks for a quote before issuing a purchase order
• You need to collect a deposit before starting work
• You're shipping internationally and customs needs pricing in advance
• The buyer's bank or finance department needs documentation to arrange payment
• You're providing samples or no-charge shipments to a foreign buyer

Use a commercial invoice when:

• Goods have shipped or services have been delivered
• You're crossing a border and need the document customs uses for duty
• You want the buyer to be able to claim VAT/GST on the purchase
• You're recording revenue for tax and accounting purposes
• You're demanding payment under contract

What to Include on Each Document

Proforma invoice essentials

• Clearly marked "Proforma Invoice" (never just "Invoice")
• Unique proforma number from a separate series (e.g. PRO-2026-018)
• Seller and buyer details
• Description of goods or services with quantities and unit prices
• Total amount in agreed currency
• Validity period (typically 30 days; volatile markets shorter)
• Shipping terms (Incoterms 2020) for international goods
• HS code for goods (required by most customs authorities)
• Estimated taxes and duties (clearly marked as estimates)
• Payment instructions for any deposit due

Commercial invoice essentials

A professional invoice needs nine elements — title, sequential invoice number, issue date, due date, your business details, client details, itemized line items, applicable tax, and a clearly highlighted total. See the full breakdown in How to Create a Professional Invoice.

For international shipments, commercial invoices additionally need country of origin, HS code, weight and dimensions, gross and net values, and the Incoterm under which goods are sold.

The Most Common Proforma vs Commercial Mistakes

1. Treating a proforma as a tax invoice

Buyers occasionally try to claim VAT credits on a proforma. They can't — and your accounting can't treat the amount as revenue either. The proforma sits in your sales pipeline, not your ledger.

2. Using the same number series

Keep proformas and commercial invoices on separate numbering schemes (e.g., PRO-2026-018 and INV-2026-018). Both should be sequential within their own series. This avoids confusion in audits and lets you cross-reference cleanly.

3. Using a proforma where a commercial invoice is required

Customs at the destination port will not assess duty against a proforma — they want the commercial invoice showing the actual transaction value paid or payable. Sending the wrong document delays clearance.

4. Forgetting to convert when the sale closes

Once the deal is confirmed and goods ship (or services are delivered), issue a commercial invoice referencing the proforma. Don't leave the proforma as the final document — the buyer won't be able to record the purchase or claim input tax.

A Practical Example

You're a Dublin-based design agency. A new US client wants a website built. The flow:

1. Discovery call → you quote €18,000.
2. You issue a proforma invoice marked "Proforma Invoice PRO-2026-018", valid 30 days, showing €5,400 deposit due to start (30%) and €12,600 due on launch.
3. The client's finance team uses the proforma to route internal approval and issue payment for the deposit.
4. You receive €5,400 — you may issue a payment receipt and a separate VAT invoice for the deposit (Irish rules require this for VAT vendors).
5. Work proceeds. On launch you issue the commercial invoice for the €12,600 balance (or the full €18,000 with deposit offset, depending on your accounting setup), marked properly per Irish VAT rules.
6. Client pays the balance. You issue a final payment receipt.

Generate Both for Free

Use our proforma invoice creator for the upfront quote and our free invoice creator for the final commercial invoice. Both run in your browser, no signup, and produce clean PDFs in seconds. Need country-specific tax handling? Pick the right setup: UK, Australia, India, Canada, Singapore, Ireland, New Zealand, or South Africa.

The distinction between proforma and commercial isn't bureaucratic nitpicking — it determines whether your buyer can claim tax credits, whether customs releases the goods, and whether the amount appears on your books. Get it right at the right stage, and the rest of the sale flows smoothly.