Commercial

MRA Credit Note Rules: 5 Common Mistakes

Avoid these 5 common credit note mistakes that trigger MRA penalties

Codeblix Team · MRA-listed EBS Provider · June 5, 2026 · 5 min read

Credit notes are one of the most heavily regulated areas of MRA e-invoicing. Here are 5 common mistakes.

Mistake 1: Issuing without a reason

Every credit note must have a reason. The MRA requires this and your EBS should block credit notes without one.

Mistake 2: Issuing without referencing the original invoice

Every credit note must reference the original invoice. The MRA requires this and your EBS should block credit notes without a reference.

Mistake 3: Issuing a credit note for a fiscalised invoice but forgetting to fiscalise the credit note

Credit notes must also be fiscalised with the MRA. They get their own IRN.

Mistake 4: Breaking the hash chain

Credit notes are part of the hash chain. They must be inserted correctly to maintain chain integrity.

Mistake 5: Issuing a credit note for a non-fiscalised invoice

If the original invoice was never fiscalised, the credit note cannot be fiscalised either. Resolve the original invoice first.