A proforma invoice confuses many freelancers and small business owners — is it a real invoice? Do clients have to pay it? Does it go in the books? This guide answers all of it clearly, with examples for freelancers, importers, and service businesses.
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What Is a Proforma Invoice?
A proforma invoice (sometimes written as "pro forma invoice") is a preliminary billing document sent before a sale is finalised or goods are delivered. The word "proforma" is Latin for "as a matter of form" — meaning it is a formal estimate, not a confirmed payment demand.
Key things a proforma invoice is not:
- Not a formal request for payment
- Not recorded as income in your accounting
- Not legally binding on the buyer
- Not a tax document
Proforma Invoice vs Commercial Invoice
| Feature | Proforma Invoice | Commercial Invoice |
|---|---|---|
| Purpose | Estimate / quote | Payment request |
| When issued | Before sale / delivery | After delivery / completion |
| Legally binding | No | Yes |
| Recorded in accounts | No | Yes |
| Tax document | No | Yes (VAT/GST invoice) |
| Label | "Proforma Invoice" | "Invoice" |
| Sequential invoice number | Optional | Required |
Important: Once the work is done or goods are delivered, you must issue a proper commercial invoice — the proforma is replaced, not converted. The commercial invoice gets the sequential invoice number and goes into your accounting records.
When to Use a Proforma Invoice
1. Requesting a Deposit Before Work Begins
Many freelancers send a proforma invoice when requesting a 50% upfront deposit. It shows the client what the full project will cost and how much the deposit is — before the work is confirmed. Once the client pays the deposit, you start work and issue a proper invoice at the end for the remaining balance.
2. International Trade and Customs
This is the most common use in physical goods businesses. When shipping goods internationally, customs authorities often require a proforma invoice to:
- Assess import duties and taxes before shipment
- Process import licences and permits
- Arrange letters of credit
3. Quotes and Cost Estimates
Some industries (construction, events, manufacturing) use proforma invoices as formal quotes that show exactly what the client will be charged if they proceed. It is more formal than a verbal quote but not yet a payment demand.
4. Pre-Sale Approval
Large corporate clients often require a proforma invoice so their procurement or finance team can approve the spend before committing to the purchase. The proforma goes through their approval process; once approved, they issue a purchase order; then you deliver and invoice.
What to Include on a Proforma Invoice
- The words "Proforma Invoice" clearly at the top (not just "Invoice")
- Your business name, address, and contact details
- Client name and address
- Issue date and validity date (e.g. "Valid for 30 days")
- Itemised list of goods or services with quantities and unit prices
- Subtotal, any applicable taxes, and total amount
- Currency
- Your payment details (so the client can pay the deposit if agreed)
- A note: "This is a proforma invoice and is not a demand for payment"
How to Create a Proforma Invoice
Use any standard invoice template — including our free invoice generator — and:
- Fill in all the usual fields (your details, client details, line items, total)
- Change the title from "Invoice" to "Proforma Invoice"
- Add a validity period (e.g. "Valid until 27 May 2026")
- Add a note at the bottom: "This is a proforma invoice only and does not constitute a formal demand for payment"
- Do NOT assign a sequential invoice number (save that for the real invoice)
Proforma Invoice for Freelancers — Practical Example
A graphic designer quotes a client £800 for a brand identity project. Before starting, they send a proforma invoice for the full £800 and request a 50% deposit (£400) to proceed. The client approves and pays the deposit. The designer completes the work. They then issue Invoice INV-047 for the remaining £400 balance — this is the official commercial invoice that goes into their accounts. The proforma is not recorded anywhere in the books.