Proforma invoice: what it is and when to use one
What a proforma invoice is, how it differs from a real invoice and a quote, and the situations where sending one actually helps you get paid faster.
"Proforma invoice" is one of those terms that sounds more complicated than it is. If you've ever had a client or a customs form ask for one and weren't quite sure what to send, you're not alone — plenty of small business owners go years without needing one, then suddenly need to produce one by the end of the day. Here's what it actually is, and the handful of situations where it earns its place in your paperwork.
What a proforma invoice actually is
A proforma invoice is a preliminary bill of sale — it shows what you plan to charge, for what, and under what terms, before the final invoice is issued. It looks almost identical to a real invoice: your business details, the client's details, line items, totals, and payment terms. The key difference is what it's not:
- It's not a demand for payment.
- It doesn't get a slot in your invoice numbering sequence.
- It doesn't appear in your revenue or tax records as a sale.
Think of it as a formal preview. It tells the other side "this is what the real invoice will say when it arrives," without actually being the thing that triggers payment or counts as a completed transaction.
Proforma invoice vs quote vs invoice
These three get mixed up constantly, so it's worth being precise:
- A quote is an offer — "here's what I'd charge if you hire me." It's sent before any work is agreed, and the numbers can still be negotiated.
- A proforma invoice is sent after the deal is essentially agreed, but before the final invoice. It's more formal and detailed than a quote, often matching the real invoice almost line for line, but it's still not a request for payment.
- An invoice is the real thing — a demand for payment, with its own unique sequential number, and it's what actually lands in your accounts as a sale.
If you want the fuller breakdown of quotes versus invoices versus receipts, our plain-English guide to the difference covers that in more depth.
When a proforma invoice actually helps
A proforma invoice isn't something most small businesses need for everyday sales. It earns its place in a few specific situations:
Customs and international shipping
If you're shipping physical goods across a border, customs authorities in many countries ask for a proforma invoice to assess duties and value the shipment before the goods arrive and the final invoice is issued. This is probably the single most common reason a small business ends up needing one. If you sell physical products internationally, it's worth checking with your courier or a customs broker what they expect to see on it — requirements vary by country and by what's being shipped.
New clients who need internal approval first
Larger clients, especially ones with a procurement or finance department, sometimes need a formal-looking document to get an order approved internally before they're willing to commit — "send us something we can take to accounts payable." A proforma invoice gives them exactly that, without you having to issue a real invoice (and burn a number in your sequence) for a sale that might still fall through.
Confirming a large or unusual order before committing
For a big one-off order — a large batch of product, a substantial project — sending a proforma invoice first lets the client double-check everything (quantities, pricing, delivery terms) and sign off before anything becomes official. It's a cheap way to catch an error before it becomes a real invoice with a real mistake baked in.
Requesting payment upfront without a "real" invoice yet
Some businesses use a proforma invoice as the basis for requesting an advance or deposit payment, especially for new clients where there isn't a trading history yet. The real invoice is then issued once the work actually starts or the goods ship. If you do this often, a deposit-based workflow might serve you better long-term, since it ties the upfront payment directly to your normal invoicing rather than a separate document type.
What to put on it
Keep it close to a real invoice, with one addition:
- Your business details and the client's, same as any invoice.
- Line items, quantities, unit prices and totals.
- Payment terms and bank or payment details.
- Expected delivery date or timeframe, if relevant.
- A clear label — "Proforma Invoice," not "Invoice" or "Tax Invoice" — printed prominently so nobody mistakes it for a real demand for payment.
- Tax should generally be shown, since it reflects what the real invoice will eventually charge, but a proforma invoice typically doesn't count as a valid tax invoice on its own — check with your accountant about your country's specific requirements here, especially for GST in New Zealand or Australia, or VAT in the UK, since what makes a document a valid tax invoice is quite specific and a proforma one usually isn't it.
A quick example
Say you run a small import business and a customer in another country places a large order for handmade goods. Before you ship, you send a proforma invoice listing the items, quantities, agreed prices and shipping terms. The customer uses it to arrange payment and, on their end, it travels with the shipment for customs to assess. Once the goods actually ship, you issue the real invoice — same numbers, but now it's the official record with its own sequential invoice number, and it's what goes into your books as a completed sale.
Don't overuse it
The most common mistake is treating a proforma invoice as a routine step for every sale. For most day-to-day invoicing — a freelancer billing a regular client, a tradie finishing a job — a quote followed directly by a real invoice is simpler and does the job. Reach for a proforma invoice specifically when customs, procurement, or a cautious new client genuinely need that extra, non-binding step in between.
Keeping the two documents straight
The trickiest part of using proforma invoices well is making sure they never get confused with your real invoices — different label, no shared numbering, and no accidental entry in your revenue records. InvoiceCharlie keeps proforma and real invoices visibly distinct and only counts a real, numbered invoice toward your reports and CSV export, so a preview document you sent for customs or approval never quietly inflates your sales figures.
If you're still working out the basics of what goes on an invoice in the first place, our guide to what every invoice needs is a good next read, and you can try the free invoice generator if you just need to put one document together right now.