How to Correct an Invoice After Sending It (Credit Notes, Revisions, and What to Tell Clients)

You hit send, then you see it: wrong amount, a missing line item, an outdated address, or tax that doesn't match the engagement.

Fixing it cleanly comes down to one thing: whether the client has paid.

A sent invoice is a business record. Deleting it and pretending it never existed creates numbering gaps and can make reconciliation harder at tax time. The better approach is to void and replace (if unpaid) or issue a credit note (if money already moved), keeping your paper trail intact.

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Before You Correct an Invoice, Check Whether It's Been Paid

• Not paid: In many cases, you can void the original in your records and send a corrected invoice with the next number, as long as your local rules allow that workflow. That's the simplest path.

• Paid (including partial): You can't quietly swap the original. Issue a credit note against that invoice, then send a new one if a balance is still owed.

• Disputed or overdue: Lead with clarity. Fix the paperwork, restate what's owed, and keep the tone factual. A clean correction signals you're sorting it, not hiding it. If the client is contesting the amount rather than you correcting your own error, that's a dispute, not a correction. See What to Do When a Client Disputes Your Invoice.

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Option 1: Revise and Resend (Unpaid Invoices)

1. Void the original in your system. Keep the number; change its status to void. Don't delete it or reuse the number.
2. Create a new invoice with the next number in sequence.
3. Reference what it replaces. A single line ("Replaces Invoice #1042") helps their AP match files.
4. Send it with two sentences: what was wrong and which document to pay.

For most freelancers and small-to-midsize clients, that's enough. Nobody has processed the payment yet, so a clean swap beats a patched PDF.

If voiding feels awkward or you're unsure how to handle the number, see Invoice Numbering Best Practices. Rule of thumb: don't skip, reuse, or delete numbers. Void, then continue the sequence.

Specific correction requirements vary by jurisdiction, so check your local tax authority's rules if you're unsure whether a simple void-and-replace is sufficient.

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Option 2: Issue a Credit Note (Paid Invoices)

Once the client has paid against the wrong document, a credit note (sometimes called a credit memo) is the standard fix.

A credit note partly or fully cancels an earlier invoice. It cites the original invoice number and states the credited amount.

Typical triggers:

• The client overpaid because your total was wrong
• Work was descoped after you billed
• Tax or entity details were incorrect and you're rebilling cleanly
• The invoice belonged to the wrong company

A credit note usually includes:

• A unique reference (many businesses use CN-001, CN-002, etc.)
• Issue date
• Original invoice number
• Credited amount and a short reason
• Your details and the client's

Follow with a corrected invoice only if money is still owed on different terms than the credit covers.

Example: Invoice #1042 showed $3,200 but should have been $2,800. Issue CN-005 for $3,200 referencing #1042, then Invoice #1047 for $2,800.

Some businesses issue a partial credit for the difference only; others fully reverse and rebill for a cleaner trail. Follow whichever method your accounting process or local rules require.

Nothing gets edited away. You add documents that explain the adjustment. Not every invoicing tool models void and credit-note workflows natively, so you may need to track these documents in a spreadsheet alongside your software.

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What to Say to the Client

Short beats long. Corrections land in accounting inboxes regularly.

Revised invoice (unpaid):

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Hi Sarah,

I caught an error on Invoice #1042. The homepage redesign line should have been $2,800, not $3,200. I've voided the original and attached corrected Invoice #1047.

Please disregard #1042 and pay #1047. Due date stays May 15.

Thanks, [Your Name]

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Credit note (paid):

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Hi Sarah,

Invoice #1042 used the wrong amount for the homepage redesign. I've issued Credit Note CN-005 for $3,200 (full reversal of #1042) and attached Invoice #1047 for $2,800.

The $400 difference can roll to your next invoice or be refunded, whichever is easier on your side.

Let me know which you prefer.

Best, [Your Name]

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For tone and structure on invoice emails, see How to Email an Invoice to a Client.

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Common Correction Scenarios

Wrong line amount. Unpaid: void and reissue. Paid: credit note, then new invoice if needed.

Wrong tax. Same split. Local rules vary; if corrections need a specific format in your region, pull guidance from your tax authority rather than a generic template. For general context, see Sales Tax for Freelancers.

Wrong client or address. Void and reissue to the correct entity.

Duplicate send. Void the duplicate internally. Tell the client explicitly which invoice to pay and which to ignore.

Wrong terms or due date. Void and reissue with correct terms. Invoice Payment Terms Explained covers choosing terms upfront.

Scope shifted after invoicing. If the first invoice was right when sent, bill the delta separately. The original was accurate at the time. For earlier scope discipline, see How to Bill for Scope Creep.

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Numbering Corrected Invoices

Corrections mean more paper: voided rows, credits, replacements. Numbers should stay obvious.

• Voided invoices: same number, status set to void (or equivalent). No gaps from deletion.
• Credit notes: their own sequence (CN-001, CN-002) so credits don't look like invoices.
• Replacements: next invoice number, not the voided one.
• Cross-references: every replacement or credit points back to the original number.

Automated invoicing handles parts of this. If you use a spreadsheet, keep a status column (sent, paid, void, credited) so a future you or an accountant can follow the trail. Details: Invoice Numbering Best Practices.

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Avoid These Mistakes

Deleting the original. You lose the audit story. Void it instead.

Reusing a number. Two different PDFs, one number: AP confusion and matching errors.

Editing the same PDF and reshipping it. Same number, new totals. If their system already ingested v1, this reads sloppy or worse.

Waiting. Longer waits mean approvals, budgets, and month-end close may have already happened. Correct early.

Over-apologizing. State facts, cite document numbers, offer the next step. Done.

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When to Include AP Directly

For day-to-day work you might only email your contact. Corrections often go faster if accounts payable gets the packet directly: credit note, replacement invoice, and the reference numbers tying them together.

If you don't know who that is, ask your contact to forward or CC billing. Capture that detail upfront next time via Freelance Client Onboarding Checklist.

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Fewer Corrections Going Forward

Most slips are boring: pasted the wrong row, wrong tax preset, sent before double-checking totals.

Before you send: compare line items to the agreement or statement of work, verify the client's legal name and address, confirm the math and currency, and check the due date against what you quoted. Invoicing apps reduce math and numbering mistakes compared to rebuilding each bill by hand.