Most Nigerian business owners know how to write an invoice - but far fewer know what to do when they need to cancel, reduce, or correct one. The answer is a credit note. Issuing credit notes correctly keeps your accounts accurate, your clients happy, and your VAT filings compliant with FIRS requirements.
What Is a Credit Note?
A credit note (also called a credit memo) is a document issued by a seller to a buyer that reduces the amount the buyer owes. It is the opposite of an invoice - where an invoice says "you owe me this amount," a credit note says "I owe you this reduction."
A credit note does not replace the original invoice. Both documents remain in your records, with the credit note adjusting the balance.
When Should You Issue a Credit Note in Nigeria?
Common situations that require a credit note:
1. Goods Returned
A customer returns damaged, incorrect, or unwanted goods. You issue a credit note for the value of the returned items.
2. Invoice Error - Overcharge
You invoiced ₦250,000 but the correct amount was ₦220,000. Issue a credit note for ₦30,000 (the overcharge) rather than cancelling and reissuing the invoice.
3. Service Not Delivered
You invoiced for work that was ultimately not completed or was cancelled by mutual agreement. Issue a credit note to cancel the relevant portion of the invoice.
4. Discount Agreed After Invoice Was Issued
You agreed a 10% loyalty discount after the invoice was already sent. Issue a credit note for the discount amount instead of reissuing the invoice.
5. Full Invoice Cancellation
If an entire invoice needs to be cancelled - for example, because the project was cancelled before any work began - issue a credit note for the full invoice amount (including VAT).
Credit Note vs Refund: What Is the Difference?
A credit note and a refund are not the same thing:
| | Credit Note | Refund | |---|---|---| | What it does | Reduces the amount owed or creates a credit balance | Returns cash to the buyer | | Cash movement | No immediate cash movement | Cash is transferred back | | Use | Offset against future invoices or acknowledge an error | Settle a completed transaction | | Best for | Ongoing relationships, future purchases | One-off transactions, order cancellations |
A client can use a credit note to offset it against their next invoice from you - or they can request a cash refund.
What a Nigerian Credit Note Must Include
FIRS requires credit notes to be as detailed as the original invoice. A compliant Nigerian credit note must contain:
- The words "CREDIT NOTE" clearly at the top
- Your business name, address, and TIN (if VAT-registered)
- Client's name, address, and TIN
- Credit note number - unique and sequential (e.g., CN-2026-003)
- Credit note date
- Reference to the original invoice number - e.g., "Re: Invoice INV-2026-041 dated 15 February 2026"
- Reason for the credit - brief but specific
- Itemised description of what is being credited
- Amount of the credit - broken down by item
- VAT adjustment - if the original invoice included VAT, the credit note must include a corresponding VAT credit
Credit Note Example - Nigeria
Original invoice: INV-2026-041 for ₦400,000 + ₦30,000 VAT = ₦430,000 (website development)
Situation: Client cancelled one module worth ₦80,000 before it was started.
CREDIT NOTE Adebayo Digital Ltd 14 Admiralty Way, Lekki, Lagos | TIN: 1234567-0001
Credit Note No: CN-2026-003 Date: 10 March 2026 Re: Invoice INV-2026-041 dated 1 March 2026
Issued to: XYZ Retail Ltd, Plot 5 Alausa, Ikeja, Lagos
| Description | Amount | |---|---| | Credit - e-commerce checkout module (cancelled, not delivered) | ₦80,000 | | VAT adjustment (7.5%) | ₦6,000 | | Total credit | ₦86,000 |
Revised amount due on Invoice INV-2026-041: ₦344,000
VAT on Credit Notes in Nigeria
If the original invoice included VAT, the credit note must include a VAT adjustment at the same rate (7.5%).
Your VAT filing impact:
- You originally declared ₦30,000 output VAT on INV-2026-041
- The credit note reduces your output VAT by ₦6,000
- In your next monthly VAT return, you deduct this ₦6,000 from your output VAT
Your client's VAT filing impact:
- If your client claimed ₦30,000 as input VAT, they must now reduce their input VAT claim by ₦6,000
- The credit note is their documentation for this adjustment
This is why credit notes must be issued properly - not just informally agreed over WhatsApp. Without a formal credit note, your client has no documentation to support their VAT adjustment with FIRS.
Credit Note Numbering
Credit notes should have their own sequential numbering series - separate from your invoices. Use a prefix like CN- (e.g., CN-2026-001, CN-2026-002).
This keeps your accounting clean and makes audits straightforward. FIRS auditors may request all credit notes issued during a period alongside the original invoices.
Record-Keeping for Credit Notes
Under FIRS requirements, you must retain all credit notes (and the original invoices they reference) for a minimum of 6 years. Store them in a way that allows you to match each credit note to its source invoice.
Create Professional Invoices and Credit Notes
InvoiceGenerator.ng helps Nigerian businesses create FIRS-compliant invoices quickly and professionally. For more on VAT compliance, invoice requirements, and record-keeping, see our full Nigerian Invoicing Guide.