UAE Tax Law Changes 2026: The 15-Year Audit Window and What It Means for Your Business

Most UAE business owners are aware of corporate tax and VAT. Fewer know that the rules governing how the FTA can audit your business changed significantly on January 1, 2026.

The UAE Ministry of Finance introduced Federal Decree-Law No. 17 of 2025, which amends the Tax Procedures Law (Federal Decree-Law No. 28 of 2022). The changes are substantial. The FTA’s audit window has been extended. Refund claim deadlines are now fixed and non-negotiable. Voluntary disclosure rules have been tightened. And FTA enforcement powers have been strengthened.

If you run a business in the UAE and have not reviewed these changes yet, April is a good time to do it. Some of the transitional provisions have time limits. Act on them now or lose the ability to act at all.

Here is what changed and what it means for you.

The 15-Year Audit Window

This is the change getting the most attention.

Under the previous rules, the FTA could audit your business for up to five years from the end of the relevant tax period. That standard five-year window still applies for routine audits.

But the new law adds an extended period: up to 15 years in cases involving:

• Tax evasion
• Failure to register for tax (VAT or corporate tax)

If the FTA believes you deliberately understated tax, used fraudulent records, or never registered when you should have, they can now go back 15 years instead of five.

For context, that means a UAE company that has been operating since 2011 could theoretically face audit exposure back to its earliest years if the FTA suspects evasion.

What this means in practice:

For businesses running clean books and filing on time, the 15-year window is unlikely to affect you. The FTA uses it for serious compliance cases, not routine audits.

For businesses that:

• Have not yet registered for VAT (mandatory above AED 375,000 annual turnover)
• Have not yet registered for corporate tax
• Have been underreporting income or claiming incorrect deductions

…the extended window creates material risk. The FTA has been expanding its audit capacity and cross-referencing data across systems. Businesses that assumed they were “under the radar” should take this seriously.

If you have concerns about historic compliance, a voluntary disclosure filed before the FTA contacts you will still attract reduced penalties compared to a post-audit assessment.

Fixed 5-Year Deadline for Tax Refund Claims

The new law establishes a hard five-year deadline for claiming tax refunds on credit balances.

If you have overpaid VAT or corporate tax and a credit balance sits on your FTA account, you must claim it within five years. After that, the right to recover those amounts lapses permanently.

Transitional provisions you must act on:

The law includes two important transitional rules:

1. Credit balances that expired before January 1, 2026: You have one year from January 1, 2026 (so until January 1, 2027) to submit your refund request. After that window closes, the balance is gone.

2. Credit balances that will expire within the first year after January 1, 2026: You also have until January 1, 2027 to make the claim.

If you have not checked your FTA account for outstanding credit balances recently, do it now. Log in to the EmaraTax portal, review your accounts, and identify any credits that need actioning before the deadline.

This is not theoretical. Businesses with complex VAT situations (zero-rated exports, input credit mismatches, adjustments during the VAT implementation period) sometimes accumulate credit balances and forget about them. Now those balances have an expiry date.

Voluntary Disclosures: Clarified Rules, Strong Incentives

The new law clarifies how voluntary disclosures work and reinforces that penalties are significantly reduced when you come forward before an audit begins.

A voluntary disclosure is the formal process for correcting errors in previously filed tax returns. If you realise you made a mistake, filed incorrectly, or omitted income, you can submit a voluntary disclosure to the FTA and fix it.

The incentive structure (from April 14, 2026):

Cabinet Decision No. 129 of 2025 restructured the penalty framework effective April 14, 2026. Under the current regime:

• Voluntary disclosure before any audit notification: 1% per month on the underpaid amount, calculated from the original filing deadline to the date of disclosure. No fixed penalty.
• Voluntary disclosure after audit notification but before audit starts: 1% per month plus a fixed 15% penalty on the tax difference.
• FTA identifies the error during an audit: Full penalties apply, up to 300% in serious cases.
• Deliberate evasion: Criminal referral threshold.

The practical difference is significant. A voluntary disclosure on a three-year-old error now costs roughly 36% of the underpaid amount (36 months at 1%). The same error found during an FTA audit can attract multiples of the unpaid tax. File first.

The practical advice here is straightforward. If you know there are errors in your past filings, the cost of fixing them voluntarily is significantly lower than the cost of having the FTA find them. With the extended 15-year window now in force for evasion cases, the window for issues to surface is longer.

Errors in VAT filing are common, particularly for:

• Partially exempt businesses miscalculating input VAT recovery
• Businesses that changed VAT treatment on certain supplies
• Import VAT calculations and adjustments
• Corporate tax returns filed in the first year without professional help

If you used basic accounting software or filed your own first-year returns, get a qualified UAE tax advisor to review your returns before the FTA does.

Extended Record Retention Requirements

UAE tax record retention requirements have not changed dramatically, but there is a new extension rule:

• VAT records: 5-year minimum retention
• Corporate Tax records: 7-year minimum retention
• Extended retention: If you file a refund claim before the statute of limitations expires but it remains under FTA review, you must keep records for an additional two years beyond the review period

This matters for businesses using cloud accounting software or paper records. Make sure your accounting system retains full transaction records, not just summary reports. The FTA can request original source documents, bank statements, and contracts during an audit.

If you use an ERP system like Odoo, record retention is handled automatically, with full audit trails stored securely. For businesses running basic spreadsheets or disconnected systems, record management becomes a manual task with real compliance risk.

Expanded FTA Audit and Enforcement Powers

The new law also strengthens the FTA’s operational powers:

Binding decisions: The FTA can now issue binding decisions in a broader range of situations, reducing the grey areas around informal guidance.

Document and asset seizure: During audits and examinations, the FTA has extended powers to preserve documents and seize assets where necessary. The period for which they can hold documents has been extended.

Third-party information requests: The FTA already had the ability to request information from third parties (banks, other government entities). These powers are reinforced under the new law.

Cross-matching: Expanded access to government data systems makes it easier for the FTA to cross-reference tax filings with trade data, payroll records, customs declarations, and real estate transactions. Discrepancies between these sources trigger audit flags.

The Corporate Tax Filing Season Overlaps

This matters right now because the first corporate tax returns for many businesses fall due in 2025 and 2026, depending on when their financial year ends.

If your company’s financial year runs January to December 2024, your first corporate tax return was due by September 30, 2025. If you missed it, late filing penalties are accumulating.

If your company’s financial year runs June to May (for example, if you set up in June 2023), your first return is due by the end of 2025.

Many businesses are still working through their first corporate tax return. Common errors include:

• Failing to register with the FTA in time
• Incorrect calculation of taxable income vs. accounting profit
• Missing the small business relief election (available for businesses below AED 3 million revenue)
• Incorrect treatment of related-party transactions and transfer pricing

With the new 15-year audit window applying to registration failures, businesses that have still not registered for corporate tax should do so immediately. Late registration penalties are significantly lower than penalties assessed after an FTA audit finds you were never registered.

See our UAE corporate tax guide and UAE corporate tax return guide for the registration process and what goes into the return.

VAT Compliance: Still a Priority

Corporate tax gets most of the attention, but VAT compliance remains the FTA’s primary focus given its longer operational history and larger number of registered businesses.

The key VAT checks to run now:

1. Are you registered if you should be? If your taxable turnover exceeded AED 375,000 in the previous 12 months, you were required to register. If you crossed this threshold before 2026 and never registered, you now face up to 15 years of audit exposure under the new rules, plus back taxes and penalties.

2. Are your VAT returns accurate? Common errors: treating exempt supplies as zero-rated (different VAT treatment), claiming input VAT on entertainment expenses (not recoverable), errors in import VAT declarations.

3. Are you keeping the right records? Tax invoices, credit notes, import declarations, contracts, and bank statements all need to be retained for at least five years.

For full VAT return guidance, see our UAE VAT return guide and UAE VAT registration guide.

What to Do This Month

Given these changes, here is a practical checklist for April 2026:

1. Check your FTA portal for credit balances. Log in to EmaraTax and look for any outstanding credits. If you have ones approaching the five-year mark, file the refund request now.

2. Confirm your corporate tax registration status. If you haven’t registered, do it now. The longer you wait, the higher the late penalties.

3. Review your first corporate tax return. If you filed it yourself, consider having a UAE tax advisor review it for obvious errors. A voluntary correction now is far cheaper than an FTA audit finding.

4. Run a VAT health check. If you’ve been filing VAT for a few years without professional review, a one-time VAT audit by your accountant will cost less than an FTA audit finding the same errors.

5. Check your record retention. Ensure your accounting system has complete records going back to your VAT registration date. If you’ve changed software, make sure historical data was migrated, not just balances.

6. Talk to a tax advisor about any known issues. If you know there are errors in historic filings, the voluntary disclosure window gives you a much better outcome than waiting. The new law makes the incentives clear.

The Bigger Picture

The UAE’s tax infrastructure is maturing. The FTA launched in 2017 for VAT. Corporate tax added a major new layer in 2023. The procedural amendments now in effect are the next phase: building the enforcement and audit machinery to ensure the tax system actually works as intended.

For businesses running clean, well-documented operations with professional accounting support, these changes are low-risk. For businesses that have been managing compliance casually, the extended audit window and tightened enforcement represent a meaningful increase in exposure.

The UAE’s tax system is still relatively young and the FTA has generally taken a collaborative approach to compliance in the early years. That approach is shifting. The time to get in order is now, not after a letter arrives from the FTA.