What Is a Proforma Invoice? A Complete UK Guide for 2026

A proforma invoice is a preliminary document issued before a sale is finalised. It sets out the expected goods, services, and costs so the buyer can review and approve them — but it is not a demand for payment, not legally binding, and not a VAT invoice. It must carry the endorsement "This is not a VAT invoice".

What Is a Proforma Invoice?

A proforma invoice is a draft or advance invoice sent to a buyer before a transaction is complete. It looks like a standard invoice — it includes item descriptions, quantities, prices, and totals — but it carries no legal weight. The seller is not obligated to supply at that price, and the buyer is not obligated to pay.

Think of it as a formal quotation in invoice format. It gives the buyer everything they need to arrange payment, apply for import licences, or get internal purchase approval — without creating a legal obligation on either side.

Is a Proforma Invoice Legally Binding?

No. A proforma invoice is not legally binding. It is a preliminary document only. It does not constitute a contract, a demand for payment, or a confirmed order. Neither party is legally committed until a formal sales invoice or purchase order is exchanged and accepted.

This is the most important distinction between a proforma and a final invoice. A final (sales) invoice is a legal demand for payment and creates a debt. A proforma does not.

Does a Proforma Invoice Create a VAT Tax Point?

No. A proforma invoice does not create a tax point for HMRC. A tax point (also called the "time of supply") is the date on which VAT becomes due. Because a proforma is not a VAT invoice, it does not trigger a tax point — meaning the buyer cannot use it to reclaim VAT, and the seller does not owe VAT to HMRC on the basis of a proforma alone.

The tax point is only created when:

• A VAT invoice is issued (within 14 days of supply), or
• Payment is received, or
• Goods or services are actually delivered

Until one of those events occurs, the proforma sits outside the VAT accounting system entirely.

What Must a Proforma Invoice Say?

Under UK rules, a proforma invoice must include the statement "This is not a VAT invoice" prominently on the document. This is not optional — it is a legal requirement to prevent the document being mistakenly used to reclaim VAT.

A compliant UK proforma invoice should include:

• The words "Proforma Invoice" as the document title
• The endorsement "This is not a VAT invoice"
• Your business name, address, and contact details
• The buyer's name and address
• A unique proforma reference number
• The date of issue and an expiry date
• A description of the goods or services
• Quantities and unit prices
• The net total, any applicable VAT amount (for reference only), and gross total
• Your payment terms (if requesting advance payment)

If you are VAT-registered, you may show the VAT amount for the buyer's reference — but the document must still state it is not a VAT invoice and cannot be used to reclaim VAT.

Proforma Invoice vs Sales Invoice: Key Differences

Common Uses of a Proforma Invoice

Proforma invoices are used in a wide range of business situations:

• Advance payments and deposits — sent before work begins so the buyer can arrange payment without a formal invoice being raised
• International trade and customs — used by importers and exporters to declare the value of goods for customs clearance and import duty calculations
• Internal purchase approval — large organisations often require a proforma before raising a purchase order, so finance teams can approve the spend
• New customers — some businesses send a proforma to new clients before extending credit, to confirm the buyer's details and intent
• Samples and trial orders — used when goods are sent on approval before a confirmed sale
• Subscription renewals — sent in advance of a renewal date so the buyer can budget and approve the spend

When Should You Use a Proforma Instead of a Quote?

A quote and a proforma invoice serve similar purposes — both are preliminary documents — but they are used in different contexts.

Use a quote when you are pricing a job and the client needs to approve the scope and cost before work begins. A quote is typically used in service industries and construction.

Use a proforma invoice when the scope is already agreed and you need the buyer to arrange payment or approval before you raise a final invoice. Proformas are more common in product sales, international trade, and situations where advance payment is required.

In practice, many UK tradespeople use quotes rather than proformas — but understanding the difference matters if you work with larger clients or export goods.

How Does a Proforma Fit Into the Sales Process?

The typical flow looks like this:

1. Quote or proforma — you send the buyer a preliminary document showing the expected cost
2. Buyer approves — the buyer confirms they want to proceed (and may pay a deposit based on the proforma)
3. Work is completed or goods are delivered
4. Final sales invoice — you raise a VAT invoice, which creates the tax point and becomes a legal demand for payment
5. Payment received — the invoice is marked as paid

The proforma sits at step 1 or 2. It is never the final document in the chain.

With QuoteInvoice, you can convert a proforma or quote into a final invoice in one click. All the line items, pricing, VAT, and customer details carry over automatically — so there's no re-entering data and no risk of errors when you move from negotiation to confirmed sale.

Does a Proforma Invoice Need to Be Paid?

Not automatically. A proforma is not a demand for payment. However, many businesses use proformas specifically to request advance payment — particularly for custom orders, large jobs, or new customers where credit has not been established.

If you are using a proforma to request a deposit or advance payment, make this clear in the document. State the amount required, the payment method, and your bank details. Once payment is received, you should issue a receipt or a formal VAT invoice (if VAT-registered) to confirm the transaction.

Can a Proforma Invoice Be Cancelled?

Yes. Because a proforma is not legally binding, either party can withdraw before a final invoice is raised. There is no legal obligation to proceed with the transaction based on a proforma alone.

This is one of the key reasons proformas are used in international trade — they allow both parties to agree on terms before committing to a legally binding contract.

Proforma Invoices and Making Tax Digital (MTD)

Because a proforma does not create a tax point, it does not need to appear in your VAT records or your MTD submissions. Only final VAT invoices — and payments received before an invoice is raised — create tax points that must be reported to HMRC.

This is an important distinction for tradespeople preparing for MTD for Income Tax, which becomes mandatory for sole traders earning over £50,000 from April 2026. Your proforma activity stays separate from your official tax records until the sale is confirmed and a final invoice is raised.

QuoteInvoice keeps your proforma and quote activity completely separate from your invoices — so your MTD records only include confirmed, invoiced transactions. This means your tax records are clean and accurate, with no risk of accidentally including preliminary documents in your HMRC submissions.

How to Create a Proforma Invoice: Step-by-Step

Creating a compliant proforma invoice takes less than five minutes if you follow these steps:

1. Use the correct title — label the document "Proforma Invoice", not "Invoice"
2. Add the required disclaimer — include "This is not a VAT invoice" prominently
3. Include your business details — name, address, VAT number (if registered)
4. Add the buyer's details — name, address, and any reference numbers they need
5. List the goods or services — with quantities, unit prices, and totals
6. Show VAT for reference — if VAT-registered, show the VAT amount but make clear it cannot be reclaimed from this document
7. Set an expiry date — proformas should not be open-ended; 30 days is standard
8. Send as a PDF — this prevents accidental editing and looks professional

Using software like QuoteInvoice ensures your proforma is formatted correctly with all required legal disclaimers automatically included — reducing the risk of administrative errors and keeping your documents compliant from day one.

Frequently Asked Questions

Is a proforma invoice the same as a quote?

Not exactly. Both are preliminary documents, but a quote is typically used to price a job before work is agreed, while a proforma invoice is used when the scope is agreed and you need the buyer to arrange payment or approval. A proforma looks more like an invoice; a quote looks more like a proposal.

Can I reclaim VAT on a proforma invoice?

No. A proforma invoice cannot be used to reclaim VAT. Only a valid VAT invoice — one that includes your supplier's VAT registration number, the tax point date, and the correct VAT breakdown — can be used to reclaim input VAT.

Does a proforma invoice expire?

A proforma invoice should include an expiry date — typically 30 days from issue. After that date, the prices and terms are no longer guaranteed. If the buyer wants to proceed after the expiry, you should issue a new proforma with updated pricing.

What happens after a proforma invoice is accepted?

Once the buyer accepts the proforma and any required advance payment is made, you proceed with the work or delivery. When the job is complete or goods are dispatched, you raise a final VAT invoice. This is the document that creates the tax point and becomes a legal demand for payment.

The Bottom Line

A proforma invoice is a useful tool for managing advance payments, international trade, and large client approvals — but it must be used correctly. The key rules are simple: it is not legally binding, it does not create a VAT tax point, and it must state "This is not a VAT invoice".

For UK tradespeople and small businesses, the practical takeaway is this: use a proforma when you need the buyer to arrange payment or approval before you raise a final invoice — and always follow it up with a proper VAT invoice once the work is done.

QuoteInvoice makes it easy to create compliant proforma invoices and convert them to final invoices in one click — with all the required disclaimers included automatically. Try it free for 14 days.

Written by the QuoteInvoice editorial team. QuoteInvoice is a UK-based invoicing platform built for sole traders, tradespeople, and small businesses. Our content is reviewed for accuracy against current HMRC guidance and UK business law.