How to correct an invoice you already sent (credit notes explained)
By the Billebly team · Published 5 October 2026
Every freelancer sends a wrong invoice eventually: the wrong amount, a line billed twice, the wrong client, a discount you agreed on the phone and forgot to apply. The instinct is to open the invoice, fix it, and send it again. In most EU countries that's exactly what you're not supposed to do. Once an invoice has been issued it stays in your records, and you correct it with a separate document that points back to it: a credit note. Here's when you need one, what it has to include, and how to send it without confusing your client.
Why you can't just edit or delete a sent invoice
Two things happen the moment an invoice leaves your outbox. Your client books it: their accounts team records the cost and, if they're VAT-registered, reclaims the VAT on it. And it takes its place in your own numbering sequence, which in the EU has to be sequential and gap-free under Article 226 of the EU VAT Directive (opens in a new tab).
Quietly editing the invoice breaks both. Your client now has a document in their books that no longer matches yours, and if you delete it, your sequence has a hole that reads like hidden income to anyone reviewing it. See invoice numbering and record-keeping for why that gap matters.
The VAT Directive's answer is Article 219 (opens in a new tab): "any document or message that amends and refers specifically and unambiguously to the initial invoice shall be treated as an invoice." In other words, the correction is its own document with its own number, and the original stays exactly as it was sent. That's what a credit note is.
When you need a credit note (and when you don't)
Not every invoice problem calls for one. A credit note corrects what an invoice says. If the invoice was right and the problem is with the payment, you need something else.
| Situation | What to do |
|---|---|
| The invoice is still a draft and hasn't been sent | Just fix it. It hasn't been issued yet |
| The amount, quantity, or rate was wrong | Credit note for the difference, or credit in full and reissue |
| You billed the same work twice | Credit note for the duplicate invoice, in full |
| You invoiced the wrong client | Credit in full, then invoice the right client |
| You agreed a discount or refund after invoicing | Credit note for the discount amount |
| The client cancelled part of the project | Credit note for the lines that won't be delivered |
| The VAT treatment was wrong (e.g. missing reverse charge) | Credit in full and reissue with the right VAT |
| The client paid the same invoice twice | No credit note. The invoice was correct: refund the extra payment or offset it |
| The client just hasn't paid | No credit note. Follow up first: see what to do when a client won't pay |
That last row is the common mix-up. Sending a credit note because a client is late tells your books (and your VAT return) that the money was never owed. If you eventually decide to write an invoice off, that runs through your country's bad-debt rules, not a casual credit note.
Credit in full and reissue, or credit the difference?
There are two ways to correct an invoice, and both are legitimate.
Credit the difference. Best when one thing changed and everything else on the invoice is right, like an agreed discount or a dropped line. Say invoice INV-0057 was for €2,400 plus 21% VAT (€2,904 total), and you later agree to take €400 off. You issue credit note CN-0008 for €400 plus €84 VAT (€484). The client pays €2,904 − €484 = €2,420, and both documents together tell the full story.
Credit in full and reissue. Best when the invoice is wrong in more than one place, went to the wrong client, or had the wrong VAT treatment. You credit every line of INV-0057, then send a brand-new invoice (INV-0061, the next number in your sequence, not a reused 0057) with the correct details. It's one more document, but the client ends up with a clean invoice to pay instead of a sum to work out.
When in doubt, credit in full and reissue. It's harder to get wrong, and it's the version an accounts payable team processes fastest.
Tell the client before the credit note lands
A credit note that arrives with no context looks like an error on its own. Send it with a one-line explanation: "Invoice INV-0057 had the wrong hourly rate, so I've attached a credit note cancelling it and a corrected invoice, INV-0061. Please pay INV-0061 instead." If they've already paid, say what happens to the difference.
What a credit note must include
A credit note is treated as an invoice, so the safest approach is to give it everything a regular invoice has, plus the link back to the original:
- A clear label: "Credit note" at the top, so nobody mistakes it for a new bill
- Its own sequential number, ideally in a separate series like CN-0001, CN-0002
- The issue date of the credit note itself
- Your details and your client's, including VAT numbers, matching the original invoice
- A reference to the original invoice: its number and its date
- What you're crediting and why: the lines or amounts, and a short reason such as "agreed discount" or "duplicate billing"
- The net amount, the VAT, and the total credited, at the same VAT rate as the original invoice
- Any mention the original carried, such as "Reverse charge" for cross-border B2B work
The EU rules do allow a lighter version. Under Article 226b of the VAT Directive, a document amending an invoice can be a simplified invoice, as long as it references the original and states what's being changed. The Dutch tax authority, for example, allows a simplified credit note (opens in a new tab) with just the date, your name and address, what's being credited, the VAT, and the reference to the original invoice. But it isn't allowed for every transaction (intra-EU supplies and reverse-charged services are excluded), and countries differ on the details. A full credit note works everywhere, so default to that.
Don't want to build one by hand? The free credit note generator creates a PDF credit note that references the original invoice, no signup needed.
How to number credit notes
Article 226 lets you number invoices in "one or more series," so a separate credit note series is fine, and it's the clearer option: CN- numbers never interrupt your INV- sequence, and you can see at a glance how many corrections you made in a year. The same rules apply to both series: sequential, unique, never reused.
Two mistakes to avoid:
- Don't reuse the original invoice number for the corrected invoice. "INV-0057-v2" or a second INV-0057 creates exactly the duplicate your numbering is meant to prevent. The replacement gets the next free number.
- Don't delete the cancelled invoice once it's been credited. The original, the credit note, and any replacement invoice all stay in your records together, for as long as your country requires you to keep invoices.
What happens to the VAT
A credit note doesn't only fix the paperwork, it fixes the tax. Article 90 of the VAT Directive (opens in a new tab) says that when a sale is cancelled or the price is reduced after the fact, the taxable amount is reduced too. So the credit note lowers the VAT you owe, and your client lowers the VAT they reclaimed by the same amount.
That's why the VAT rate on the credit note has to match the original invoice, even if rates have changed in the meantime: you're reversing VAT you already declared, not charging new VAT. In most countries you process the credit note in the VAT return for the period in which you issue it, not by amending the old return, but the exact rules are set nationally. Check with your accountant if you're crediting an invoice from a VAT period that's already closed.
The money is a separate question. A credit note says the client owes less; it doesn't say how the difference gets settled. If the invoice is still unpaid, the client simply pays less (or nothing, after a full credit). If they've already paid, you either refund the difference or deduct it from their next invoice. Agree on which, and say so in the credit note or the email it comes with.
Issue a credit note straight from the invoice
In Billebly, a full or partial credit note is a couple of clicks from the invoice it corrects. It copies the original lines, links back automatically, and comes with a matching EN 16931 e-invoice file.
Watch the name: "credit note" doesn't translate cleanly
If you work with clients in other EU countries, the word on the document matters more than you'd think.
- Germany: a Gutschrift sounds like the obvious translation, but in German VAT law (opens in a new tab) it means self-billing: an invoice the customer issues for your work. To avoid confusion, title a correction Rechnungskorrektur or Stornorechnung (for a full cancellation) instead.
- France: a correction is a facture d'avoir, or simply avoir. The French tax administration (opens in a new tab) expects it to reference the original invoice's number and date.
- Netherlands and Belgium: creditnota or creditfactuur, both understood.
The self-billing mix-up isn't only a German quirk. Self-billed invoices carry the mention "Self-billing" under Article 226 of the VAT Directive, and they're a different process entirely. If you're the one correcting your own invoice, keep the word "self-billing" off it.
This is general guidance, not tax advice
The EU sets the framework, but each country decides the details: what a credit note must contain, which VAT period it goes into, and how long you can still correct an old invoice. Check your national tax authority's guidance or ask an accountant, especially for large corrections or invoices from a closed tax year.
Credit notes and e-invoices
If you send structured e-invoices, a credit note is its own document type there too. In EN 16931, the European e-invoicing standard, a credit note uses type code 381 instead of the regular invoice's 380, and it references the original invoice in a dedicated field. Dutch e-invoicing rules go further and require that reference. In countries with an e-invoicing mandate, like Belgium since January 2026, a correction to an e-invoice should go out as an e-invoice too, not as a PDF.
You don't need to know the codes, just use a tool that produces the credit note in the same format as the invoice it corrects. See EU e-invoicing explained for which countries currently require e-invoices.