- Record discovery and preserve the originally filed position.
- Assess the tax effect and applicable correction route separately.
- Keep a traceable evidence file and fix the underlying process.
Record the discovery and preserve the original position
Open an issue record as soon as the difference is identified. Note the date, who found it, the affected entity and period, the original return reference and the reason it appears wrong. Save the filed return and the working papers used at the time before making changes to the accounting system.
This creates a clear starting point for review and avoids a moving target. If several people are investigating, nominate one owner to maintain the evidence file and calculation. Do not postpone recording the discovery until the amount is convenient or the next filing date approaches. Separate confirmed facts from questions that are still being investigated so the reviewer can see what is known.
Classify the error before applying a threshold
Identify whether the issue is an omitted sale, duplicate purchase, incorrect tax treatment, wrong period, import discrepancy, return-box error or refund problem. Trace the affected transaction from its document to the ledger and the filed return. An accounting imbalance is not automatically a VAT error, and a VAT error may exist even where the ledger balances.
Calculate the tax effect rather than looking only at the invoice value. A large invoice does not necessarily create an equally large tax difference. Conversely, several small items may contribute to one period’s incorrect position. Prepare a period-by-period analysis and ask the reviewer how related items should be assessed. Avoid netting unrelated errors together simply to place the result below a threshold.
Understand the main correction routes
Under Article 10 of the Tax Procedures Executive Regulation, understated payable tax exceeding AED 10,000 requires a voluntary disclosure within 20 business days of awareness. At AED 10,000 or less, correction is through the earliest permitted not-yet-due return or the discovery-period return; if no qualifying return is available, a disclosure is required within 20 business days. The threshold concerns the tax shortfall, not the invoice amount.
A zero tax difference does not automatically mean no action. FTA Decision No. 8 of 2024 requires voluntary disclosure for specified VAT-return errors or omissions without a difference in due tax. Refund errors and overstatements also require their own assessment. Use the applicable rule for the actual facts rather than treating every correction as an addition to the next return.
Prepare a review file that explains the difference
Keep the original figures, corrected figures and change between them in a single schedule. Explain the transaction and why the original treatment was wrong. Attach the documents and reconciliations supporting the revised calculation. Where a judgement is involved, retain the basis considered and any advice obtained.
For an illustrative duplicate-purchase issue, retain both ledger entries, the underlying supplier invoice, the filed-return working paper and the reconciliation showing which entry should remain. The reviewer should be able to reproduce the difference without searching the whole ledger. This example identifies useful evidence; it does not determine the correction route or input-tax treatment.
- Record the affected return, transaction references and discovery chronology.
- Show the original and revised tax treatment separately.
- Reconcile the correction to the ledger and any related return schedules.
- Identify unresolved questions, linked periods and possible refund implications.
- Keep approval and submission evidence with the final calculation.
Review the correction before submitting it
Use the FTA voluntary-disclosure user guide for the relevant submission process after the treatment has been established. The form is the output of the review, not a replacement for it. Confirm the entity, period, explanation, attachments and approved figures before submission, and retain the acknowledgement.
Also determine whether a payment or further follow-up is needed and who will monitor the account. A disclosure is not a promise that penalties will be waived, nor does it remove the need to answer later questions. If an FTA enquiry or audit is already underway, raise that fact at the beginning of the review because it may affect the procedural assessment. Keep the issue open until the agreed actions and evidence are complete.
Fix the process that caused the error
After resolving the immediate issue, identify its cause. A duplicate may point to weak invoice-number checks. A wrong tax code may point to a default rule that is too broad. A missing import entry may reveal a gap between logistics and finance. Correct the underlying process and test the change on a recent period.
Keep a short error register showing cause, correction, owner and preventive action. Use it during return reviews so recurring issues receive attention. The aim is not to create a blame file; it is to stop the same uncertainty appearing in every reporting cycle. When software settings are changed, document the effective date and check whether earlier periods were affected as well.
Questions about this guide
Can I put every historical error into the next return?
No. The appropriate route depends on the type of error, its tax effect, the period and whether an eligible return is available. Review the issue against the applicable rules before changing a current return. Keep the decision and supporting calculation on file.
Does an error with no tax difference need correction?
It can. The FTA has specified cases requiring a voluntary disclosure even without a change in due tax. Identify the actual omission or classification issue and assess it against the relevant decision; do not use a zero balance as the sole reason to do nothing.
Will a voluntary disclosure remove all penalties?
Do not assume that it will. Any penalty position depends on the facts, timing and applicable legislation. Establish the correct correction and payment steps promptly, then assess penalties or available procedures separately rather than relying on a blanket promise.
What should I send an adviser first?
Provide the affected return, original working papers, a short discovery chronology, the transaction documents and your calculation of the difference. Mention any FTA communication already received. This allows an initial assessment of both the accounting issue and the procedural position.
Sources and further reading
Research checked on 5 October 2026. Requirements can change; check the linked authority guidance for the latest position.
- FTA: Tax Procedures Executive Regulation, Article 10
- FTA: Decision No. 8 of 2024 on VAT-return error correction
- FTA: Voluntary disclosure user guide
Firswood Tax Advisory LLC
Firswood provides accounting, VAT and corporate tax services through its own qualified team in the UAE. The team includes ACCA-qualified professionals and an FTA-registered tax agent.
This guide explains the records and questions involved in the work. The official sources are listed above, with a research date. Advice on your business requires a review of its circumstances and records.
