No UAE law fixes a number of days for how long a corporate tax audit itself lasts: the statute fixes the frame around it — at least five business days' notice before the audit starts, a five-year window in which the FTA may audit a tax period (fifteen in evasion cases, effective 1 January 2026), and a four-year limit for completing the assessment once the audit notification is issued. How many weeks the audit actually occupies depends almost entirely on how quickly you can produce reconciled records.
TL;DR
- The FTA must notify you at least five business days before a tax audit starts, specifying the reason, scope and period (Federal Decree-Law No. 28 of 2022, Tax Procedures Law; tax.gov.ae, checked September 2026).
- The FTA may audit a tax period within five years of its end — extendable up to fifteen years for tax evasion or failure to register, since Federal Decree-Law No. 17 of 2025 took effect on 1 January 2026 (DLA Piper analysis, December 2025; UAE Ministry of Finance).
- Once the audit notification is issued, the FTA must complete the audit and issue its findings within four years of that notification date (Tax Procedures Law as amended; checked September 2026).
- There is no statutory duration for the audit itself: simple cases close in weeks, record-heavy cases run for months — the practical driver is how fast you supply complete, reconciled evidence.
What the law fixes — and what it leaves open
The statute fixes dates around the audit, not the audit's length:
| Milestone | Legal timing | Source |
|---|---|---|
| Notice before the audit starts | At least 5 business days' prior notice, stating the reason, scope and audit period | Federal Decree-Law No. 28 of 2022 (Tax Procedures Law); FTA audit guidance, tax.gov.ae |
| How far back the FTA can audit | 5 years from the end of the tax period; up to 15 years for evasion or failure to register (from 1 January 2026) | Federal Decree-Law No. 28 of 2022 as amended by Federal Decree-Law No. 17 of 2025; DLA Piper, December 2025 |
| Completing the audit and assessment | Within 4 years of the audit notification date | Tax Procedures Law, as amended; checked September 2026 |
| Objecting to the assessment | Within the period stated in the assessment notice (generally 20 business days under the current procedures framework) | Tax Procedures Law reconsideration and objection provisions, tax.gov.ae |
| The audit itself | No fixed statutory duration | — |
So the honest answer is a range, not a date: an SME with reconciled books that responds quickly can see a routine audit close within weeks; a group with transfer-pricing schedules, related-party dealings and reconstructed records can stay open for many months — bounded, eventually, by the four-year completion rule.
What actually stretches an audit
- Record retrieval. The FTA examines records supporting the return; corporate tax records must be kept seven years from the end of the tax period (Article 56, Federal Decree-Law No. 47 of 2022; FTA reminder, 27 August 2025, tax.gov.ae). Producing them from a shoebox takes weeks; producing them from reconciled books takes hours.
- VAT cross-checks. A corporate tax audit often pulls VAT threads with it; the VAT error-correction rules determine whether small mismatches fix themselves in the next return or need a voluntary disclosure.
- Related-party and transfer-pricing documentation. Disclosure schedules and local files add review time — the transfer pricing documentation thresholds decide whether the file exists at all.
- Free zone status. QFZP verification means testing the qualifying-income split and the de minimis condition; the QFZP qualification guide lists what the FTA will test.
- Response discipline. Every document request answered partially generates a follow-up cycle; each cycle costs weeks.
What you control: the readiness checklist
- Reconcile monthly, not at audit time. The same discipline that lowers corporate tax filing cost lowers audit duration — the bank-feeds workflow is the operating version of it.
- Keep the seven-year file organised. Returns, financial statements, ledgers, contracts and VAT filings, indexed by tax period.
- Freeze nothing, explain everything. Never alter records during an audit; provide what the notice asks for, in the format asked, with a covering note.
- Use the five business days. The notice window is for assembling your team and pulling the file — an accountant who knows the books shortens every later step.
Audit-ready before the notice arrives
Finanshels keeps UAE companies' corporate tax files reconciled, indexed and seven-year ready — so an audit is a document handover, not a reconstruction project.
FAQ
How much notice does the FTA give before a corporate tax audit?
At least five business days, with the notice stating the reason, scope and audit period (Federal Decree-Law No. 28 of 2022; tax.gov.ae, checked September 2026).
How far back can the FTA audit a corporate tax return?
Five years from the end of the tax period — extendable up to fifteen years for tax evasion or failure to register, effective 1 January 2026 under Federal Decree-Law No. 17 of 2025.
Is there a deadline for the FTA to finish an audit?
Yes — the audit and its assessment must be completed within four years of the audit notification date under the Tax Procedures Law as amended.
Can the FTA audit without notice?
The general rule is prior notice of at least five business days; narrower exceptions (such as judicial authorisation in specific circumstances) exist under the Tax Procedures Law and are not for a taxpayer to rely on.
What shortens a corporate tax audit most?
Complete, reconciled records produced quickly. The FTA verifies the return against records you must keep for seven years (Article 56, Federal Decree-Law No. 47 of 2022); every retrieval gap becomes a new request cycle.
