A proforma invoice is a preliminary bill a seller sends before a sale is final. It lists the goods or services, quantities, prices and terms the way the real invoice will, so the buyer can approve the deal, arrange payment or clear paperwork, but it is not a tax invoice and records no sale in either side's books.
You usually meet one at an awkward moment. A new client says yes in principle, then their finance team asks for a proforma before they can raise a purchase order. Or you want a deposit before you start, and sending a real invoice for work you have not done feels wrong. Or an overseas buyer says their bank needs a proforma before it will release the money. In each case a quote is too light and an invoice is too early, and the proforma invoice is the document built for that exact gap. The International Trade Administration describes it simply as a quote in an invoice format.
Proforma invoice meaning, in plain terms
Pro forma is a Latin phrase, usually translated as "as a matter of form". That is a fair description of the document: it has the form of an invoice without the force of one. You will see it written as proforma invoice, pro forma invoice and pro-forma invoice, and sometimes called a proforma bill. They all mean the same thing. "Performa invoice" and "proformer invoice" are common misspellings of it, not different documents.
Is this you?
- A client has agreed a price but says they cannot approve anything without a proforma.
- You want part of the money up front and are not sure what to send to ask for it.
- You sent a real invoice early, the deal changed, and now you have an invoice to cancel or credit.
- A buyer abroad needs paperwork for their bank or an import license before the goods exist.
- Someone sent you a proforma and you are not sure whether you are meant to pay it or record it.
If any of those sounds familiar, the rest of this page covers what the document does, what it does not do, what goes on it, and what to send afterwards.
What a proforma invoice actually does
It is an offer in invoice form, not a final bill
A proforma invoice looks like an invoice and lists the same information: line items, quantities, pricing, delivery terms. What it does not do is record a sale. Nothing has been supplied yet. Its job is to give the buyer a clear, professional preview of cost and scope before either side commits, which is why it sits closer to an estimate or a quote than to a bill.
Can a client pay against a proforma invoice?
Yes, and many do. Sellers often use a proforma to ask for a deposit or full payment in advance, and the UK tax authority describes exactly that pattern: pro-forma invoices are often used to offer goods or services to potential customers, and the goods or services will not be supplied unless payment is received. What matters is the step after the money arrives. A proforma is not the final record of the sale, so once you are paid or you deliver, you issue the real invoice. In the UK that is a rule and not a courtesy: the same guidance says that if you supply the goods or services or receive payment after issuing a proforma, you must issue a proper VAT invoice.
It does not touch your books
Because no sale has happened, a proforma invoice has no accounting effect. It is not revenue for you and not an expense for the buyer, and it does not belong in accounts receivable or accounts payable. That only starts once you issue the real invoice. The practical upside: if the deal changes shape or falls through after a proforma goes out, there is nothing to reverse on either side, because nothing was ever booked. Compare that with sending a real invoice too early, where undoing it means a cancellation or a credit note.
It is not a tax invoice
If you are VAT registered in the UK, HMRC is direct about this. Pro-forma invoices cannot be used as evidence to reclaim input tax, even if they show all the details required for a VAT invoice, and HMRC says to make sure they are clearly marked "this is not a VAT invoice". Tax rules differ by country, so if your buyer needs a document to reclaim tax, check with your accountant what your own rules require before you rely on a proforma for it.
A sample proforma invoice
Here is what one looks like for a small design studio that wants a deposit before starting. The figures are an illustration, not data.
| PROFORMA INVOICE PF-014 (not a tax invoice) | |||
|---|---|---|---|
| From: Harbour Lane Studio To: Castell Outdoor Ltd Buyer reference: Rebrand 2026 |
Date: 8 October 2026 Prices valid until: 7 November 2026 Estimated start: within 5 working days of deposit |
||
| Description | Qty | Unit price | Amount |
| Brand identity design | 1 | $2,400 | $2,400 |
| Website build, 8 pages | 1 | $3,600 | $3,600 |
| Estimated total | $6,000 | ||
| Deposit to confirm the order (40%) | $2,400 | ||
| Balance, invoiced on delivery | $3,600 | ||
| Payment terms: deposit by bank transfer to confirm the order. A final invoice will be issued for each payment received. | |||
Three things make it a proforma and not an invoice: the title says so, the prices carry an end date, and it promises a final invoice later. Everything else is what the real invoice will repeat.
When businesses actually use a proforma invoice
Before a new client commits
Sending a detailed proforma gives a new client something concrete to review and approve internally before you start. That matters most on custom orders, project work, and any job with enough moving parts that a one-line quote would not cover it. Some buyers confirm by signing the proforma and sending it back, which is all "countersigning" a proforma means.
For internal budget approval
Some buyers, particularly at larger companies, need a formal document to route through their own approval process before a purchase order gets cut. A proforma invoice gives their finance team something that reads like the real thing without you having to treat the deal as closed.
To ask for a deposit or payment in advance
If you take money before you deliver, a proforma states the amount and the terms without claiming a sale has already happened. Once the payment lands, issue the real invoice for it.
In international trade
This is where a proforma does real paperwork. According to the International Trade Administration, a pro forma invoice may be required by the buyer to apply for an import license, contract for pre-shipment inspection, open a letter of credit or arrange for transfer of hard currency. Note who needs it there: the buyer, for their bank and their own authorities. That is a different thing from what US customs will accept at the border, which is worth separating carefully, because the two get conflated constantly.
Draft the proforma while the client is still saying yes
Put your line items, your terms and a valid-for period into the free quote generator and download the PDF. It is titled as a quote, so add a line saying it is a proforma and that a final invoice will follow. No signup, and nothing to install.
What US customs actually requires
A proforma invoice is not a substitute for a commercial invoice at the US border, and the rules are specific about this.
The baseline is that a commercial invoice shall be filed for each shipment of merchandise under 19 CFR 141.83. The International Trade Administration puts the same point in plainer terms: a commercial invoice is a required document for the export and import clearance process, and it is what customs officials in the buyer's country use to assess duties and taxes.
A pro forma invoice only comes into it as a fallback. Under 19 CFR 141.91, goods can be entered without the required invoice, but only when US Customs and Border Protection is satisfied that the failure to produce it is due to a cause beyond the importer's control. Even then the importer has to file a declaration of inability along with a pro forma invoice, post a bond equal to one and one half times the invoice value of the merchandise, and produce the real invoice within 120 days of filing the entry summary.
So the honest summary is that a pro forma buys time under conditions, at the cost of a bond and a deadline. It does not replace the commercial invoice. If you want the fuller comparison of the two documents, we cover it separately in proforma invoice vs commercial invoice.
Proforma invoice vs a regular invoice
A regular invoice is a real request for payment for goods or services delivered or in progress, and it lands in your accounts receivable the moment you send it. A proforma never reaches that stage. The difference is not cosmetic: one starts a payment clock and a bookkeeping entry, the other starts a conversation.
Proforma vs a quote or estimate
A proforma invoice and a quote do a similar job, but the proforma is more formal and usually carries details a simple quote skips: shipping terms, delivery timelines, payment conditions, and for cross-border deals, customs information. That extra structure is exactly what makes it usable for the financing and import situations above, where a one-page quote would not hold up.
The four documents side by side
| Document | When it is sent | Goes in the books? | What it is for |
|---|---|---|---|
| Quote or estimate | Before the buyer decides | No | Stating a price |
| Proforma invoice | After a yes in principle, before the sale is final | No | Approval, advance payment, bank or import paperwork |
| Invoice | When goods or services are supplied or payment is due | Yes | Requesting payment and recording the sale |
| Commercial invoice | With an international shipment | Yes | Customs clearance and assessing duties |
What to include in a proforma invoice
Label it clearly as a proforma invoice in the title so nobody mistakes it for a real bill. Beyond that, include your business details and the buyer's, a description of the goods or services with quantities and unit prices, any discounts or shipping charges, the estimated total, your proposed payment and delivery terms, and an expiration date for the pricing. That last one is not a formality. Material costs, freight rates and currency all move, and an open-ended price is a problem you have handed to your future self.
For an export sale, the International Trade Administration's list for a pro forma invoice is a useful checklist:
- Seller's name and address
- Buyer's name and address
- Buyer's reference
- Items quoted
- Prices of items, per unit and extended totals
- Weights and dimensions of the quoted products
- Discounts, if applicable
- Terms of sale or the Incoterm used, including the delivery point
- Terms of payment
- Estimated shipping date
- Validity date
The validity date is the item most often left off. Proformas are not tracked separately in our data, but quotes are, and they show the habit. Nearly three quarters of quotes carry no expiry date (836 of 1,125 quotes, 34 businesses), so last year's price is still technically on the table. That figure is from Billbooks quote data, published in the quote study.
Does a proforma invoice need a number?
Give it one, but keep it out of your invoice sequence. A separate series such as PF-001, PF-002 lets you and the buyer refer to the right version without leaving gaps in your real invoice numbers, which are generally expected to run in sequence.
Does a proforma invoice count as revenue?
No. It has no accounting effect until it becomes a real invoice. It will not appear on a profit and loss statement, will not change your accounts receivable balance, and does not need reversing if the deal shifts. Treat it as a sales and planning document, not a bookkeeping one.
If you have already sent the wrong document
Two mix-ups are common, and both are fixable.
You sent a real invoice when you meant a proforma. The sale is now in your books and possibly in the buyer's. Do not just delete it. Cancel it or raise a credit note for the full amount, tell the buyer in one line why, and send the proforma in its place.
You were paid against a proforma and never issued the real invoice. Issue it now, dated when you issue it, for the amount received, and reference the proforma number on it. The buyer needs it for their records, and you need it for yours. If tax was involved and the payment was some time ago, ask your accountant how to date and report it.
How to turn a proforma into a real invoice
Once the buyer approves it and the deal is confirmed, keep the final invoice as close to the proforma's numbers as you reasonably can. If a real cost moved, a material price, an updated shipping quote, a currency swing, say so rather than letting the buyer find it on the final bill. Then send the actual invoice through something that tracks whether it has been opened and paid, so following up is not guesswork. If you are still working out what belongs on that final document, what is an invoice covers the fundamentals.
To stop the two documents drifting apart, build the invoice from the proforma instead of retyping it. A spreadsheet copy works if you are careful. Invoicing software with a proforma feature does it for you: Billbooks proforma invoices, for one, are kept apart from your invoice list and convert into an invoice once approved, so the line items the client agreed are the ones they are billed.
Your next step is small: write the proforma for the deal in front of you today, with a validity date on it, and send it before the client's yes cools.
Two free tools for the proforma and the invoice that follows it
Frequently asked questions
What is a proforma invoice?
A proforma invoice is a preliminary bill a seller sends before a sale is final. It sets out the goods or services, prices and terms in invoice format so the buyer can approve, pay in advance or arrange paperwork, but it is not the final invoice and is not recorded as a sale.
What does proforma invoice mean?
Pro forma is Latin, usually translated as a matter of form. A proforma invoice has the form of an invoice without being one: it shows what the final invoice will say before the sale has actually taken place.
Is a proforma invoice legally binding?
Not on its own. A proforma invoice is an offer, not a record of a sale. Whether money is owed depends on what you and the buyer have actually agreed, so on a large deal get that agreement in writing and ask a lawyer if it matters.
Can you pay a proforma invoice?
Yes. Sellers often use a proforma to ask for a deposit or payment in advance, and buyers pay against it. Once payment is received or the goods or services are supplied, the seller should issue the real invoice, and in the UK HMRC says a proper VAT invoice must then be issued.
Is a proforma invoice the same as a proforma bill or a performa invoice?
Yes. Proforma bill is another name for the same document, and performa invoice is a common misspelling. Proforma, pro forma and pro-forma are all accepted spellings.
Does a proforma invoice count toward my revenue or accounts receivable?
No. It has no accounting impact at all. Nothing enters your books until you issue the real invoice, which is also why nothing needs reversing if the deal falls through.
Can I reclaim VAT on a proforma invoice?
Not in the UK. HMRC says pro-forma invoices cannot be used as evidence to reclaim input tax, even if they show all the details required for a VAT invoice. Wait for the proper VAT invoice. Rules in other countries differ, so check locally.
When do I actually need a proforma invoice?
The common cases are getting a new client's internal budget approval before you start work, asking for a deposit before a job begins, giving a buyer a detailed cost preview on a custom or project based order, and international trade, where the International Trade Administration notes a buyer may need one to apply for an import license, arrange a pre-shipment inspection, open a letter of credit or transfer hard currency.
Can you use a proforma invoice for services?
Yes. It works the same way as for goods: list the services, the price, the terms and a validity date. Shipping details such as weights and Incoterms only apply when goods are being sent.
Does a proforma invoice need an invoice number?
It should have its own reference, kept separate from your real invoice numbers. A series such as PF-001 avoids gaps in the invoice sequence.
Can I use a proforma invoice instead of a commercial invoice for a US import?
Only as a conditional fallback. Under 19 CFR 141.91 goods can be entered without the required invoice when CBP is satisfied the failure to produce it was beyond the importer's control, and even then it takes a declaration, a pro forma invoice, a bond of one and one half times the invoice value, and the real invoice within 120 days of the entry summary.
What is the difference between a proforma invoice and a quote?
They overlap, but a proforma invoice is more formal and usually includes shipping terms, delivery timelines and payment conditions that a simple quote leaves out, which is why it holds up for financing and customs use where a quote would not.
