Paid invoice: what “paid in full” means and how to mark it

What a paid invoice is (and isn’t)

An invoice asks for money. On its own, it says nothing about whether the money ever came. A paid invoice closes that gap: the seller adds a short statement that the full amount was received, on a given date, by a given method.

Three things to keep straight:

• Only the seller can mark an invoice as paid. A client writing “paid” on their own copy proves nothing.
• It’s the same invoice. Same number, same issue date, same lines and totals. You’re adding information, not creating a new invoice in your sequence.
• It isn’t a separate receipt. It does the same job as a receipt, but on the document that itemises the sale. For stand-alone receipts, see our receipt template.

Why clients ask for one

People usually ask for a paid invoice because someone else is reimbursing or checking the expense:

• an employer repaying expenses an employee covered;
• an insurer settling a claim against receipts;
• a grant funder that only releases money against proof of payment;
• their accountant or tax records. The IRS lists invoices among the supporting documents for business expenses, alongside proof of payment such as cancelled cheques, account statements and card receipts, and says supporting documents should show the payee, the amount paid, proof of payment, the date and a description.

A paid invoice ticks all of those boxes on one page, which is why it’s the document clients prefer to forward.

Exactly what to write on it

There’s no statutory wording in the UK or the US. A paid invoice that will satisfy an expenses team or a funder shows five things:

1. the word “PAID” (or “Paid in full”), clearly visible;
2. the date the payment arrived, not the invoice date;
3. the payment method: bank transfer, card, cheque, cash, PayPal and so on;
4. the amount received, so nobody has to guess;
5. the payment reference where there is one (transfer reference, cheque number), plus your name or signature if the client asks.

Where to put it: near the total or in the footer, so it survives a scan or a photocopy. On paper, a “PAID” stamp filled in by hand works. With a PDF, add the note to a copy and keep the original exactly as issued.

Partial payments, deposits, cash and cheques

Part payment. An invoice is only “paid in full” when the balance is zero. For a part payment, write something like: “Payment received 12 Sep 2026 by bank transfer: £800.00. Balance due: £600.00.” If you write “paid” on an invoice that isn’t settled, you’ve handed your client evidence that they owe you nothing.

Deposits. If you took a deposit, the final invoice should deduct it and show the balance. Mark the final invoice as paid only when that balance arrives. In the UK, VAT-registered sellers should note that an advance payment usually creates its own tax point: HMRC’s rule is that the tax point is the date you issue a VAT invoice for it or the date you receive it, whichever comes first.

Cash. This is where the note matters most, because there’s no bank trail. Under HMRC’s Cash Accounting Scheme, if a customer pays you in notes and coins you must, if they ask, endorse their copy of your sales invoice with the amount paid and the date. The same applies the other way round: if you pay a supplier in cash, make sure they endorse your copy. The scheme is open to businesses expecting taxable supplies of £1.35 million or less in the next year.

Cheques. A cheque can bounce. Many businesses wait until it has cleared before writing “paid”.

How long to keep it all. In the UK, VAT-registered businesses must keep VAT records for at least six years. In the US, the IRS says to keep records for as long as they may be needed for tax purposes, generally three years from filing, and longer in some cases. Keep the paid copy with the original and the bank record.

The “paid in full” cheque trap (US)

In the US, “paid in full” can also be something a customer writes, not you. If a client disputes your bill and sends a cheque for less, with a clear note that it’s offered in full satisfaction, cashing it may settle the whole debt. This is called accord and satisfaction. The model rule is Section 3-311 of the Uniform Commercial Code; states adopt the UCC into their own law, so check your state’s version before relying on the details below.

Under that section, the debt can be discharged when the payment was offered in good faith, the amount was genuinely in dispute (or not fixed), and the cheque or an accompanying letter carried a conspicuous statement that it was tendered in full satisfaction. There are escape routes: in most cases you can undo the effect by repaying the amount within 90 days, and an organisation can designate a specific address for disputed payments. But the safest move is simple: if a short payment arrives marked “paid in full” and you don’t agree, don’t bank it before you’ve got advice.

This rule is about disputed debts. It doesn’t apply to a client who simply pays the full amount on time. Outside the US, different rules apply, so ask a local adviser if a client tries the same thing.

Step by step: marking an invoice as paid

Two mistakes to avoid:

• Issuing a “new” paid invoice with a new number. That creates a duplicate in your records. Keep the original number.
• Marking it paid before the money arrives. Some clients ask for a paid invoice in advance to close a claim. Say no: if the payment never comes, you’ve signed that it did.

Keeping track of who has paid

You can only mark invoices as paid if you know which ones are. That’s where things usually slip: transfers arrive with half a reference and it’s not clear which invoice they settle.

In Binome360, you mark an invoice as paid in one sentence, and overdue invoices stay flagged until you do. So you can see at a glance which invoices you can confirm as paid and which still need chasing. For the ones that don’t get paid, our guide to chasing an unpaid invoice has four email templates.

Wording you can copy

PAID IN FULL on [DD Mon YYYY]
Method: [bank transfer / card / cheque no. … / cash]
Reference: [bank reference or cheque number]
Amount received: [£0.00]
[Your name] – signed: ______________

For a part payment:
Payment received on [DD Mon YYYY] by [method]: [£0.00]
Balance due: [£0.00]

Frequently asked questions

Is a paid invoice the same as a receipt?

They prove the same thing, that money changed hands, but a paid invoice does it on the itemised invoice, while a receipt can be a separate, simpler document. If a client asks for a “receipted invoice”, they want the invoice itself marked as paid, usually so they can forward one document. Our guide on how to write an invoice covers what the invoice itself must include.

Do I have to give a paid invoice if a client asks?

In general there’s no rule forcing you to, with one UK exception: under the Cash Accounting Scheme, you must endorse the invoice for cash payments if the customer asks. In practice, refusing makes little sense. It takes two minutes and saves your client a round of emails with their funder or employer.

Can I change the invoice after it’s paid?

Don’t change the content. The number, date, lines and totals stay as issued; you only add the payment note. If the invoice itself was wrong, issue a credit note and a new invoice rather than editing the old one.

How do I mark an invoice paid by card?

Write “Paid in full on [date] by card” and, if useful, the transaction or authorisation number from your card terminal or payment provider. Never copy the client’s full card number onto an invoice.

What if the client can’t get a paid invoice from a supplier?

A bank or card statement showing the payment, together with the invoice, is often accepted as proof of payment. Check the funder’s or insurer’s rules before sending.

In short

A paid invoice is the original invoice, same number, with your confirmation that it’s been paid in full: date, method, amount, reference and, if needed, a signature. Only mark it once the money has actually arrived, never for a part payment, and in the US think twice before banking a short cheque marked “paid in full”. First action: save the wording above as a snippet so you can add it in seconds next time a client asks.

Sources

• IRS, “What kind of records should I keep”: irs.gov/businesses/small-businesses-self-employed/what-kind-of-records-should-i-keep.
• IRS, “How long should I keep records?”: irs.gov/businesses/small-businesses-self-employed/how-long-should-i-keep-records.
• HMRC, “Cash Accounting Scheme (VAT Notice 731)”, updated 18 December 2023: gov.uk/guidance/vat-cash-accounting-scheme-notice-731.
• HMRC, “Record keeping for VAT (VAT Notice 700/21)”, section 2.4 (six-year retention): gov.uk/guidance/record-keeping-for-vat-notice-70021.
• HMRC, “VAT guide (VAT Notice 700)”, section 14 (advance payments and deposits): gov.uk/guidance/vat-guide-notice-700.
• Uniform Commercial Code § 3-311, “Accord and satisfaction by use of instrument”, Legal Information Institute, Cornell Law School: law.cornell.edu/ucc/3/3-311.

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