Invoice vs Receipt: What's the Difference?

The key difference

The simplest way to remember it:

• An invoice says: “You owe me this money.” It is sent before payment.
• A receipt says: “You have paid me this money.” It is issued after payment.

An invoice creates a financial obligation. A receipt acknowledges that the obligation has been fulfilled. They are both important, but they belong at different points in the payment process.

What is an invoice?

An invoice is a formal document from a seller (you, the freelancer) to a buyer (your client) that requests payment for goods or services delivered. It arrives either just before or just after the work is completed, depending on your payment terms.

Invoices serve several purposes:

• They create a legal record of the debt — if a client does not pay, your invoice is your primary evidence that money is owed
• They document income — for your self-assessment tax return, every invoice you raise is a record of revenue
• They establish payment terms — when to pay, how to pay, and what the late payment consequences are
• If VAT-registered, they are a legal requirement — a VAT invoice has specific mandatory fields that your client needs to reclaim VAT

An invoice does not mean you have been paid. It means payment is due.

What is a receipt?

A receipt is a document that confirms payment has been received. It is issued by the seller after the buyer has paid.

Receipts are the buyer's proof of purchase. When a client pays your invoice, they may ask for a receipt to confirm the transaction in their own records. In a business-to-business context, the client's bank statement or the paid invoice itself often serves this purpose — but some clients, particularly those with strict accounts processes, will ask for a formal receipt.

For freelancers, receipts also come up on the expense side: when you buy something for your business — software, hardware, stationery — the seller gives you a receipt. You keep those receipts to substantiate your expense claims in your tax return.

When to use each

Send an invoice when:

• You have completed work for a client and it is time to get paid
• You have agreed a payment milestone and want to bill for it
• You are requesting a deposit before starting a project
• You deliver goods and need to bill the buyer

Issue a receipt when:

• A client asks you to confirm their payment has been received
• You accept cash payment (always issue a receipt for cash — it protects both parties)
• Your business sells goods at a point of sale

Most freelancers working in a service business rarely need to issue standalone receipts. When a client pays, they often treat the paid (marked as settled) invoice as their receipt. If a client explicitly asks for one, you can create a simple document confirming: the date of payment, what was paid for, the amount paid, and your details.

Can a document be both?

Yes — a common approach is to mark an invoice as “Paid” once payment is received and send it back to the client. This serves as both the original invoice and a confirmation of receipt in one document.

Some freelancers also issue a receipt invoice — essentially an invoice that already states the amount has been received, often used for cash or immediate payments (e.g. at a market stall or upon delivery). There is nothing wrong with this, as long as it is clear that payment has already been made.

What goes on each document

A standard invoice should include:

• The word “Invoice” prominently
• A unique invoice number
• Invoice date
• Your name and address
• Client name and address
• Description of goods or services
• Amount owed (and VAT breakdown if VAT-registered)
• Payment terms (e.g. “Due within 30 days”)
• Your bank details or payment link

A receipt should include:

• The word “Receipt” or “Paid”
• Date of payment
• Your name and address
• Client name
• What was paid for
• Amount paid
• Method of payment (bank transfer, card, cash)

If you are VAT-registered, a receipt for a VAT-able transaction should also show your VAT number and the VAT amount, because your client needs it to reclaim input VAT.

HMRC and record keeping

For your self-assessment tax return, invoices are your income records. Every invoice you raise is evidence of money you earned. HMRC expects you to keep these for at least 5 years after the filing deadline for the relevant tax year.

On the expense side, receipts are your evidence. When you claim a business expense, you need a receipt (or equivalent — bank statement, invoice from a supplier) to back it up.

Digital copies are perfectly acceptable — HMRC does not require paper originals. Photographing receipts as you go and keeping invoices in a folder (physical or digital) satisfies the record-keeping requirement.

For a deeper look at invoicing requirements, see our How to Invoice in the UK guide.