When to Issue a Credit Note vs Void an Invoice: The Rules That Matter
You sent invoice INV-2026-0043 with the wrong total. Do you void it, delete it, or issue a credit note? The wrong choice leaves a hole in your audit trail — or worse, a tax record that doesn't reconcile. This guide gives you the single test that decides which instrument is correct, plus the country-specific rules on what voiding does (and doesn't do) to your tax position.
The one question that decides everything
Has the invoice reached the client?
- No — the invoice is still a draft, or you never sent it. The error is yours alone. Void it (or just fix the draft). Nothing external has happened yet, so there's nothing to correct formally.
- Yes — the client has the invoice. The document exists in the world. You cannot quietly take it back. Issue a credit note. The correction must be a separate, traceable document.
Everything else follows from that test. It's the same principle behind the golden rule in our credit note guide: once an invoice has been sent, never silently edit or delete it.
What voiding an invoice actually does
Voiding marks an invoice as invalid while keeping it in your records. The invoice number is never reused, the document stays visible (flagged "VOID"), and its amount drops to zero in your totals.
Voiding is the right tool when the invoice shouldn't have existed as a document at all:
- It was never sent. You created it by mistake, sent a draft to the wrong client, or generated two copies of the same invoice.
- Duplicate. You (or your software) created the same invoice twice.
- Wrong client. You addressed it to the wrong business and caught it before sending.
- Same-day fix. You noticed the error minutes after creating it and the invoice hasn't left your system.
The key point: a voided invoice is your internal record of a mistake that went nowhere. Because the client never received it, no one else needs to act on it, and the tax authority sees a clean, sequential record with one voided number — which is exactly what auditors expect to find occasionally.
Why you can't just delete it
Deleting an invoice destroys the number sequence. To an auditor, a missing invoice number looks like a destroyed document — the exact thing tax authorities are trained to suspect. Every accounting system worth its name makes voided invoices easy and deleted invoices hard (or impossible) for this reason. If your software doesn't offer a void function, ask for one before you reach for delete.
What a credit note does instead
A credit note is a new, separate document sent to the client that reduces or cancels the amount on an already-issued invoice. The original invoice stays exactly as it was; the credit note sits alongside it as the correction. See how to write a credit note for the full requirements.
The credit note is mandatory when:
- The client has received the invoice — by email, PDF, link, or post. Any of these count.
- You need to correct part of it — an overcharge, a returned item, a post-invoice discount, or work that didn't happen.
- The client may already have recorded it in their accounts or claimed tax on it. They need a document to unwind that.
- The invoice sits in a closed tax period or you've already filed a return covering it. Most accounting software will only let you void invoices in the current open period; for anything older, the credit note is the only path.
The decision table
| Situation | Void | Credit note | |---|---|---| | Invoice never sent to the client | ✓ | ✗ | | Duplicate invoice created by mistake | ✓ | ✗ | | Invoice sent, amount is wrong | ✗ | ✓ | | Invoice sent, partial correction needed | ✗ | ✓ | | Invoice sent, full cancellation needed | ✗ | ✓ (full credit) | | Invoice already paid | ✗ | ✓ (then refund against it) | | Invoice already tax-filed / closed period | ✗ | ✓ | | Client recorded it or claimed input tax | ✗ | ✓ |
The tax difference between voiding and crediting
This is where the two instruments diverge in the eyes of tax authorities:
- Voiding an unsent invoice creates no tax event. The invoice never existed commercially, so there's no sale to reverse and no tax adjustment to make. You simply note it as void in your books.
- A credit note is a tax-adjustment document. When you credit an overcharge, you're telling your tax authority: "this sale was smaller than I reported." The supplier reduces output tax; the client reduces their input-tax claim. Each country has rules about how that adjustment is documented — our tax-adjustment guide covers the UK's 14-day rule, Australia's adjustment notes, and Canada's section 232 requirements in detail.
The dangerous middle ground: voiding an invoice that was actually sent and recorded. The client still holds their copy, may have claimed tax on it, and your records now disagree with theirs. If an auditor compares your sales ledger against a client's purchase records, a voided-but-sent invoice reads as income you hid. When in doubt, the credit note is always the safer correction.
Two worked examples
Example 1: Void — the unsent duplicate (UK)
Liam, a freelance copywriter in Leeds, generates invoice INV-2026-0051 for client "Harbor Co." He then realises his invoicing software created the same invoice twice (INV-2026-0051 and INV-2026-0052) and neither has been sent yet. He voids INV-2026-0052, keeping the number in his ledger flagged "VOID — duplicate of INV-2026-0051, not sent." No credit note, no tax adjustment — the invoice never existed commercially.
Example 2: Credit note — the sent overcharge (US)
Priya, a freelance designer in Austin, emailed invoice INV-2026-0033 for $4,500 to a client, who paid it. Two weeks later she discovers she double-counted 5 hours: the correct total was $4,000. The invoice was sent and paid, so voiding is impossible — she issues credit note CN-2026-0004 for $500, then refunds $500 to the client. The invoice stays intact in her books, the credit note is the paper trail, and the refund is recorded against the credit note.
Common mistakes
- Voiding an invoice the client already received. Once sent, voiding creates two conflicting records. Issue the credit note.
- Editing the sent invoice and resending it. Same problem — the client's copy no longer matches yours. Credit note.
- Deleting the invoice to "fix" numbering. Destroys the sequence. Void it.
- Issuing a credit note for a draft. Overkill — just fix the draft.
- Using a credit note for a non-paying client. If the invoice was correct but the client won't pay, that's a bad debt, not an overcharge. A credit note would incorrectly reverse your revenue and tax — see how to chase late payments instead.
FAQ
Can I void an invoice that was already paid? No. A paid invoice has cash against it and almost certainly a tax record. Issue a credit note for the correction and refund the client (or hold the credit on their account). Any accounting software that lets you void a paid invoice is letting you create a reconciliation disaster.
What if I sent the invoice to the wrong client by email? The invoice went out — even to the wrong recipient. Void your internal copy is not enough: the wrong client received a document they could act on. Issue a full credit note to the wrong client, void the original in your books, and create a fresh invoice for the correct client.
My invoice has a typo in the client's address but the amount is right. Credit note or void? If the invoice was never sent, fix the draft. If it was sent, most tax authorities (notably the UK's HMRC) don't require a credit note for formal errors that don't change the taxable amount — a corrected invoice is the usual route. Check our guide on invoice numbering for how to handle re-issues cleanly.
Does a voided invoice count toward my revenue? No — a voided invoice nets to zero. But it stays visible in your ledger, which is the point: it proves the number wasn't hidden.
How do I void an invoice properly in my books? Mark it VOID (never delete), keep the number in sequence, add a one-line reason ("duplicate — never sent", "wrong client — never sent"), and date the void. If your software has a void status, use it; don't just set the amount to zero.