A tax credit note reduces the VAT on a supply you have already invoiced. A debit note increases it. In the UAE you cannot simply delete or reissue a tax invoice once it has gone out — if the value changes, you correct it with a note that references the original. Getting this wrong is one of the most common causes of a VAT return that will not reconcile.
When you must issue a credit note
A tax credit note is required whenever the consideration for a supply is reduced after the tax invoice was issued, or the supply is cancelled. The usual triggers:
- Goods returned by the customer
- A retrospective discount, rebate or volume allowance
- Cancellation of the supply in whole or in part
- An error that overstated the value or the tax charged
- A price adjustment agreed after invoicing
The note must be issued within 14 days of the event that gave rise to the adjustment.
What a tax credit note must contain
- The words “Tax Credit Note” clearly displayed
- Supplier name, address and TRN
- Recipient name, address and TRN where registered
- Date of issue
- Reference to the original tax invoice — its number and date
- The value of the reduction, and the tax being credited, in AED
- A brief explanation of the reason for the adjustment
The reference to the original invoice is the part people skip, and it is the part that matters. A credit note that floats free of an identifiable invoice is very hard to defend in an audit, because nobody can tie the reduction to the supply it relates to.
Debit notes: the other direction
Where the consideration increases after invoicing — additional work agreed, an undercharge discovered, a price escalation clause triggered — you issue a tax debit note, or simply an additional tax invoice for the difference. Same principle: it must reference the original document and state the additional tax in AED.
In practice many UAE businesses issue a supplementary invoice rather than a formal debit note. Either works, provided the linkage to the original supply is clear and the tax is accounted for in the correct period.
Which VAT return period the adjustment belongs in
This is where returns go wrong. The adjustment belongs in the period in which the credit note was issued, not the period of the original invoice. You do not go back and restate the earlier return.
Both sides must move together. The supplier reduces output tax; the customer reduces the input tax previously recovered. If the customer ignores the credit note and keeps the original recovery, they are carrying an overclaim — and that surfaces when the FTA cross-matches, which structured e-invoicing will make far easier from 2027.
Correcting an error versus adjusting a supply
A genuine commercial change — a return, a discount — is handled by credit note. A reporting error is different. If you filed a return with the wrong figures, a credit note does not fix that; you may need a voluntary disclosure.
The rough dividing line: if the invoice was right when issued and the commercial facts changed afterwards, use a credit note. If the invoice or the return was wrong at the time, look at whether disclosure is required. Disclosing before the FTA finds it almost always costs less than being assessed — our guide to UAE tax penalties sets out the difference.
What to keep
Credit and debit notes are part of your VAT records and fall under the same retention rules as invoices — see UAE tax record retention. Keep the note, the original invoice it references, and the evidence of the underlying event: the return authorisation, the credit approval, the revised contract. In an audit the note alone rarely satisfies; the FTA wants to see what happened.
Frequently asked questions
When must a tax credit note be issued in the UAE?
Within 14 days of the event that reduced the consideration or cancelled the supply — a return, a retrospective discount, a cancellation or a correction of an overcharge.
Can I just cancel and reissue the original tax invoice?
No. Once a tax invoice has been issued, a change in value is corrected by a credit or debit note that references the original. Deleting and reissuing breaks the audit trail.
Which VAT period does a credit note go in?
The period in which the credit note is issued, not the period of the original invoice. You do not restate the earlier return.
What is a tax debit note?
The mirror of a credit note, used where the consideration increases after invoicing. Many businesses issue a supplementary tax invoice instead, which is acceptable if it references the original supply.
Does the customer have to do anything?
Yes. The customer must reduce the input tax previously recovered in the period the credit note is received. Ignoring it leaves an overclaim on their return.
Do I need the customer TRN on a credit note?
Where the recipient is VAT registered, yes — the same identification requirements as a tax invoice apply.
What if the original invoice cannot be found?
Reconstruct the reference from your accounting records and document why. A credit note with no traceable original is the version an auditor will challenge.