luckpandaA credit note is a document a seller issues to reduce the amount a buyer owes on an invoice, or to cancel the invoice completely. It is sometimes called a credit memo. Instead of editing or deleting an invoice once it has been issued, you issue a credit note that refers back to it.
Credit notes exist because issued invoices should never change. Your client may already have entered the invoice in their books, paid it, or claimed the tax on it. A credit note corrects the position on both sides with a clear, dated record.
When to issue a credit note
- Goods returned. The buyer sends back some or all of the goods.
- Overcharging. You charged the wrong price, the wrong quantity or the wrong tax rate.
- A discount after the invoice. You agree a price reduction, a volume rebate or compensation for a problem after invoicing.
- Cancelled work. A service is cancelled after you invoiced for it.
- A duplicate invoice. You invoiced the same supply twice.
- Wrong client details. In many tax systems the clean fix for a wrong buyer is to cancel the invoice with a credit note and issue a new one to the right party.
If you undercharged, the opposite document applies: a debit note, or a supplementary invoice, that increases the amount due.
What a credit note must show
A credit note should carry the same core details as the invoice it corrects, plus a link back to it:
- The title "Credit note".
- Its own unique number from a separate series, such as CN-2026-0004.
- The date of the credit note.
- Your details and the buyer's details, matching the original invoice.
- The number and date of the original invoice.
- The reason for the credit, such as "10 units returned, damaged in transit".
- The items, quantities and amounts being credited, and the tax being reversed at the original rate.
- The total credit.
In the UK, a VAT credit note should carry the same details as a VAT invoice, show the VAT being credited, and refer to the original invoice. In India, the GST rules list the particulars a credit note must contain, including the supplier's GSTIN, a consecutive serial number, the recipient's details, and the number and date of the original tax invoice.
Free toolCredit noteCorrect or refund an issued invoice.Open the credit noteA worked example
An Indian supplier invoiced a client in the same state for 100 units at ₹1,000.00 each, plus 18% GST. Ten units were returned.
| Document | Taxable value | CGST 9% | SGST 9% | Total |
|---|---|---|---|---|
| Original invoice INV-2026-0118 | ₹1,00,000.00 | ₹9,000.00 | ₹9,000.00 | ₹1,18,000.00 |
| Credit note CN-2026-0004 | ₹10,000.00 | ₹900.00 | ₹900.00 | ₹11,800.00 |
| Net position | ₹90,000.00 | ₹8,100.00 | ₹8,100.00 | ₹1,06,200.00 |
If the client has not paid yet, they now owe ₹1,06,200.00. If they paid in full, the ₹11,800.00 credit can be refunded or set against their next invoice, whichever you agree.
How a credit note affects your accounts and tax
For the seller, a credit note reduces sales revenue and the amount receivable from the customer, and reduces the output tax you owe for the period in which you issue it. For the buyer, it reduces purchases and the amount payable, and reduces the input tax they can claim.
That is why both sides need the same document. If you reduce your output tax, your client must reduce their input tax claim by the same amount.
In LuckPanda, posted documents are never edited. A credit note is posted as a reversal against the original invoice, so your ledger shows both the original sale and the correction, with dates.
India: GST time limit
Under Section 34 of the CGST Act, a credit note must be declared in your GST return no later than 30 November following the end of the financial year in which the original supply was made, or the date you file the annual return for that year, if earlier. After that, you cannot reduce your GST liability through a credit note, although you can still issue a commercial credit note that does not adjust tax.
UK and EU: VAT
In the UK, you can reduce the VAT you account for when you issue a valid credit note, and your customer must reduce their input tax claim. Across the EU, rules on credit notes for VAT are set nationally under the VAT Directive, and the details required and time limits differ between member states.
Time limits and the tax treatment of discounts differ between countries. Check the rule with your accountant before relying on a credit note to reduce tax already reported.
Credit note vs debit note vs refund
| Credit note | Debit note | Refund | |
|---|---|---|---|
| Issued by | Seller | Seller (or buyer, in some systems) | Seller |
| Effect | Reduces the amount owed | Increases the amount owed | Returns money already paid |
| Typical reason | Return, overcharge, discount | Undercharge, extra charges | Overpayment, cancelled order |
| Tax effect | Reduces output tax | Increases output tax | None by itself; follows the credit note |
Terminology varies. In some countries, a buyer issues a "debit note" to its supplier to request a credit. In India's GST system, the supplier issues both credit notes and debit notes.
A refund is a payment, not a document type. You usually issue a credit note first, then refund the money against it.
Good practice
- Keep credit notes in their own numbered series and never reuse numbers.
- Always reference the original invoice.
- Credit at the same tax rate as the original invoice, even if rates have changed since.
- Explain the reason in plain words. It saves questions from your client's accounts team and from auditors.
- Do not delete or edit the original invoice. Both documents stay in your records.
- Issue the credit note promptly, so that both sides report it in the same tax period where possible.