Once a tax invoice is issued, it cannot be corrected, cancelled, or replaced by simply issuing a new one. Saudi VAT law provides a specific mechanism for every post-invoice adjustment: the credit note for downward adjustments, and the debit note for upward ones. Using these documents incorrectly — or skipping them entirely — produces incorrect output tax declarations and incorrect input tax recovery positions for both parties.
The Legal Basis: Articles 40 and 54
The obligation to issue credit and debit notes arises from two interconnected articles. Article 40 of the Implementing Regulations sets out the circumstances that require an adjustment to previously declared output tax. Article 54 then establishes when a credit note or debit note must be issued and what it must contain.
Article 40(1) lists the triggering events — the circumstances that cause a previously invoiced supply to require a VAT adjustment:
- Cancellation of the supply in whole or in part
- A change in the nature or quantity of goods or services supplied
- A change in the consideration agreed for the supply
- Return of goods by the customer
- Any other circumstances that cause the amount of VAT originally charged to differ from the true VAT on the supply
The GCC VAT Agreement (Article 57) frames the same principle: a taxable person who adjusts supply consideration must document the adjustment in a credit or debit note that corrects the original tax invoice. This document is treated in the same way as the original invoice.
Credit Notes vs. Debit Notes: The Distinction
| Document | When Issued | Effect on Supplier | Effect on Customer |
|---|---|---|---|
| Credit note | VAT on original invoice exceeded the true VAT on the supply (e.g., price reduction, return, cancellation) | Reduces output tax previously declared | Must reduce input tax previously claimed |
| Debit note | VAT on original invoice was less than the true VAT on the supply (e.g., price increase, additional services) | Increases output tax to be declared | May increase input tax claim (additional recovery) |
Article 54(3) adds a third scenario: where neither of the Article 40(1) circumstances applies, but the supplier becomes aware of an error on the invoice — in their information or the customer’s — they may issue a credit or debit note to correct that error. This covers factual mistakes such as a wrong customer address or a mis-stated TIN, even where the VAT amount itself is correct.
The regulations treat these two scenarios differently. Commercial adjustments (price changes, returns, cancellations) under Article 40(1) produce mandatory credit or debit notes. Factual errors under Article 54(3) produce optional corrective notes — the supplier may issue one. In both cases, both the supplier and customer must retain copies of the original invoice and the adjusting document.
What a Credit or Debit Note Must Contain
Under Article 54(4), a credit or debit note must contain all the information required in the corresponding invoice — that is, if it relates to a full tax invoice, it must contain all the fields of a full tax invoice; if it relates to a simplified tax invoice, the simplified fields apply.
In addition, Article 54(4) imposes two specific requirements unique to adjusting documents:
- Reference to the sequential number of the original tax invoice to which the credit or debit note relates — this is a mandatory link between the two documents
- A clear reference to previously issued tax invoices related to the supply, as specified by ZATCA — in practice, this means identifying the original invoice by number and date
Article 54(5) adds that the note should include any discount information that would be required on the corresponding invoice.
A credit note that does not clearly reference the sequential number of the original tax invoice it is adjusting is non-compliant. ZATCA cannot trace the adjustment back to the original supply. The supplier cannot use the credit note to reduce their output tax declaration, and the customer cannot use it to adjust their input tax. This error is far more common than it should be — particularly in ERPs where credit notes are generated against customer accounts rather than specific invoice numbers.
How Credit and Debit Notes Flow Through the VAT Return
The return period in which a credit or debit note is reported depends on whether it produces an increase or decrease in the supplier’s output tax, governed by Article 40(4) and (5):
An adjustment that results in an increase in the supplier’s output tax must be reported in the VAT return for the period in which the triggering event occurred — not the period in which the debit note was issued if those dates differ. The supplier must not delay reporting an upward adjustment.
An adjustment that results in a decrease in the supplier’s output tax must be reported in the later of: (a) the period in which the triggering event occurred, or (b) the period in which the credit note was issued to the customer. This means the supplier cannot reduce output tax before the credit note exists and has been issued.
Under Article 40(6), when a credit or debit note is issued to a customer who is (or was) a taxable person, the customer must correct their input tax in the VAT return for the period in which the credit or debit note is issued. The customer’s correction is tied to receipt of the document, not to the original supply period.
Article 40(10) contains an additional mechanism: if a taxable person has claimed input VAT on a supply but has not paid the supplier in full within twelve months following the month of supply, they must make a downward adjustment to their input VAT for the unpaid portion. This is an automatic obligation — it applies even where no credit note has been issued. The April 2025 amendments introduced a carve-out for performing financing contracts (murabaha, finance lease, lease-to-own) from licensed providers, but the general rule still applies to standard commercial payables.
Practical Scenarios
A retailer returns SAR 5,000 worth of goods (VAT-exclusive) to a supplier. The supplier must issue a credit note for SAR 5,000 + SAR 750 VAT, referencing the original invoice. The supplier reduces output tax by SAR 750 in the period the credit note is issued (or the return event, whichever is later). The retailer reduces input tax by SAR 750 in the period the credit note is received.
A contractor and client agree to a SAR 20,000 increase in project fees after the original invoice was issued. The contractor issues a debit note for SAR 20,000 + SAR 3,000 VAT, referencing the original invoice. The contractor increases output tax in the period the triggering event (agreement) occurred. The client increases input tax in the period the debit note is received.
A supplier discovers that an invoice was issued with the customer’s commercial registration number instead of their TIN. No commercial adjustment has occurred. The supplier may issue a corrective credit/debit note under Article 54(3) to correct the factual error. Both parties retain the original and the correction. The VAT amount itself does not change.
- Once a tax invoice is issued, it cannot be amended or cancelled — all adjustments must be made through a formally compliant credit or debit note.
- Credit notes are issued when the original invoice overstated VAT (price reductions, returns, cancellations). Debit notes are issued when it understated VAT (price increases, additional scope).
- Every credit or debit note must contain all the fields of the corresponding invoice type, plus a mandatory reference to the sequential number of the original invoice.
- A credit note without the original invoice reference is non-compliant and cannot be used by either party to adjust their VAT position.
- Upward adjustments (debit notes) must be reported in the period the triggering event occurred. Downward adjustments (credit notes) are reported in the later of the event period or the period the credit note was issued.
- Customers must adjust their input tax in the period the credit or debit note is received — not the period of the original supply.
- The twelve-month non-payment rule in Article 40(10) requires downward input VAT adjustment on unpaid invoices — automatically, even without a credit note from the supplier.
This article is for informational purposes only and does not constitute legal or tax advice. Regulations referenced are based on ZATCA publications current at time of writing. Always verify with a qualified Saudi tax professional for your specific circumstances.