Tunde runs a commercial printing business in Ikeja, Lagos. In June, he invoiced a client ₦480,000 for 10,000 branded bags. The client received only 8,500 because 1,500 came out of the print defective.
The client called and asked for a corrected document. Tunde did not know what to send. He thought about cancelling the invoice and reissuing it — but his accountant said that would create a mess in the accounts. What he actually needed to issue was a credit note.
If you have ever had a price dispute, returned goods, an overbilling, or a situation where a sent invoice needed to change, this guide explains exactly when to use a credit note, when to use a debit note, and what each document does to your records.
A credit note is a document that reduces the amount a customer owes you. You issue it after you have sent a tax invoice.
It is not a refund on its own. It is a formal reduction in the invoice value — recorded in both your books and the customer's books so that both sets of accounts agree.
The core rule: you cannot simply cancel a tax invoice and pretend it never happened. Once a tax invoice is issued, it creates a VAT record. A credit note is the only correct way to reduce or reverse it.
A debit note is the opposite — it increases the amount a customer owes you. You issue it when your original invoice was too low.
Both documents must reference the original tax invoice they are adjusting. Without that reference, neither the NRS nor your auditor can trace the correction.
If your business is VAT-registered (turnover above ₦100M annually), credit notes and debit notes affect your monthly VAT return.
Credit note: reduces your output VAT. If you issued a credit note for ₦72,000 net (₦5,400 VAT at 7.5%), your VAT payable for that month is reduced by ₦5,400. Your customer's input VAT claim is also reduced — they must notify you of the reduction in their next return.
Debit note: increases your output VAT. The additional amount is taxable supply.
This is why you cannot simply cross out a number on the original invoice. The adjustment must be a separate, numbered document so both parties can correctly file their VAT returns.
The situation: Invoice INV-2026-0044 for ₦480,000 (10,000 bags at ₦48 each). 1,500 bags were defective.
Step 1 — Calculate the credit
1,500 bags × ₦48 = ₦72,000 net
VAT at 7.5% (if Tunde is VAT-registered) = ₦5,400
Total credit = ₦77,400
Step 2 — Issue a credit note
Reference: CN-2026-0003
Re: Invoice INV-2026-0044
Reason: 1,500 defective units returned
Net credit: −₦72,000
VAT adjustment: −₦5,400
Total: −₦77,400
Step 3 — Net off the balance
The client originally owed ₦480,000 + ₦36,000 VAT = ₦516,000.
After the credit note: ₦516,000 − ₦77,400 = ₦438,600 due.
Step 4 — Agree with the client
Send the credit note to the client. They update their accounts payable. The ₦77,400 either reduces their next payment or is set off against a future invoice.
Step 5 — Update your VAT return
Tunde's output VAT for the month is reduced by ₦5,400. The client's input VAT is reduced by the same amount.
The document number should follow its own sequence: CN-2026-0001, CN-2026-0002, etc. for credit notes; DN-2026-0001 for debit notes.
Credit notes and debit notes are available on Professional and Enterprise plans.
When creating an invoice, select "Credit Note" or "Debit Note" from the type dropdown. Lucrive will:
Free plan users see a one-click upgrade prompt when they select these types.
Once sent, the credit or debit note appears in your invoices list with the correct type badge — separate from your regular invoices — so your records stay organised.
Keep every credit and debit note you issue for at least six years — the NRS audit window under the Nigeria Tax Administration Act 2025.
File credit and debit notes alongside the original invoices they reference. If the NRS audits your VAT returns, they will want to match the adjustments to the original supplies.
Your accounting software or spreadsheet should record:
For a full walkthrough of how to create a professional invoice in Lucrive — including setting your business TIN, adding VAT, and sending by email — see the professional invoice guide for Nigerian businesses.
Can I just reissue the invoice with the corrected amount?
No. Once a tax invoice is issued, it is a VAT document. Cancelling it without a credit note leaves a discrepancy in your VAT records. Issue a credit note to reduce the original and then — if needed — issue a fresh invoice for the correct amount.
Does the customer have to agree to the credit note?
Yes. A credit note adjusts both sets of accounts. Send it to your customer with an explanation. They must process it on their end.
What if the customer issued the debit note, not me?
Sometimes a buyer issues a debit note to a supplier — it is a request for a credit. Treat it as a request. If you agree to the adjustment, issue your own credit note. If you do not agree, respond in writing.
Can I issue a credit note for the full invoice amount?
Yes. A full-amount credit note effectively cancels the invoice. It reduces the customer's liability to zero. This is the correct way to reverse a tax invoice — not by deleting it from your system.
Tunde issued CN-2026-0003, his client's accounts payable matched up, and his VAT return for June reflected the reduced liability. The defective bags were replaced, the credit was applied, and both businesses moved on without a dispute.
Credit and debit notes are not complicated once you understand what they are for. They exist to keep your financial records accurate when reality does not match the invoice.
This article is for general information. Confirm VAT treatment and filing requirements with your tax adviser or the Nigeria Revenue Service.
Create a credit note or debit note on Lucrive — available on Professional and Enterprise plans.
Sources & further reading