FTA’s Extended 15-Year Audit Window: How UAE Businesses Should Prepare

The UAE tax framework generally operates with a five-year limitation period for tax audits and assessments. However, Federal Decree-Law No. 17 of 2025 introduced important provisions that allow the Federal Tax Authority (FTA) to conduct a tax audit or issue a tax assessment for a significantly longer period in specific circumstances.

Under the amended Tax Procedures Law, a tax audit or assessment can extend to 15 years where a taxable person fails to register for tax when required or where tax evasion is involved, subject to the conditions set out in the legislation.

This extended period is particularly important for UAE businesses because it changes how companies should think about historical tax records, internal controls, tax registration, accounting systems, and audit readiness.

This article explains the FTA 15 year audit window in the UAE, how it differs from the standard five-year limitation period, what circumstances can trigger the extended period, and what businesses can do to strengthen their compliance processes.

What Is the FTA 15-Year Audit Window?

The FTA 15-year audit window refers to the extended limitation period under the amended UAE Tax Procedures Law for specific situations involving tax evasion or failure to register for tax when registration was required.

Under the general rule, the FTA can conduct a tax audit or issue a tax assessment within five years from the end of the relevant Tax Period.

However, Federal Decree-Law No. 17 of 2025 provides for a much longer period in certain circumstances:

• Tax evasion: The FTA may conduct a tax audit or issue a tax assessment within 15 years from the end of the Tax Period in which the tax evasion occurred.
• Failure to register: Where a person failed to register for tax when required, the FTA may conduct a tax audit or issue a tax assessment within 15 years from the date on which the person was required to register.

The 15-year period is therefore not a general extension that applies to every UAE business or every tax audit. It applies to specific circumstances identified by the Tax Procedures Law.

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What Is the Standard 5-Year UAE Tax Audit Limitation Period?

The standard rule under the UAE Tax Procedures Law is that the FTA generally cannot conduct a tax audit or issue a tax assessment after five years from the end of the relevant Tax Period.

For example, if a company’s Tax Period ended on 31 December 2026, the ordinary five-year limitation period would generally be calculated from the end of that Tax Period.

This standard limitation period provides a general boundary for FTA audit and assessment activity. However, businesses should not interpret the five-year period as an absolute guarantee that all tax exposure disappears after five years.

The law contains specific exceptions and circumstances that can extend the period, including tax evasion and failure to register.

When Does the 15-Year Audit Period Apply?

The extended period applies in specific situations. Two of the most important are tax evasion and failure to register for tax when required.

1. Tax Evasion

Tax evasion is one of the most significant circumstances that can result in the extended audit period.

Where tax evasion has occurred, the FTA may conduct a tax audit or issue a tax assessment within 15 years from the end of the Tax Period in which the tax evasion occurred.

This means that a business involved in conduct that falls within the applicable tax evasion provisions may remain subject to potential tax audit and assessment exposure for substantially longer than the ordinary five-year period.

Businesses should therefore ensure that tax returns, accounting records, invoices, contracts, transaction documentation, and supporting calculations accurately reflect their actual business activities.

2. Failure to Register for Tax

The second major circumstance concerns businesses or persons who were required to register for tax but failed to do so.

Where a person fails to register for tax when required, the FTA may conduct a tax audit or issue a tax assessment within 15 years from the date on which the person was required to register.

This makes tax registration monitoring particularly important for businesses that experience rapid growth, changes in business activities, or changes in their tax registration position.

Businesses should not rely solely on their accounting teams to identify registration obligations. Tax registration requirements should form part of the company’s wider compliance framework.

5 Years vs 15 Years: What Is the Difference?

The key difference is that the five-year period is the general limitation period, while the 15-year period is an extended limitation period that applies in specified circumstances.

For an ordinary tax matter where no extended limitation rule applies, the FTA generally has five years from the end of the relevant Tax Period to conduct an audit or issue an assessment.

Where the applicable conditions for tax evasion or failure to register are met, the law allows the FTA to examine matters over a significantly longer period.

Businesses should therefore distinguish between:

• Standard audit exposure: Generally five years from the end of the relevant Tax Period.
• Tax evasion exposure: Up to 15 years from the end of the relevant Tax Period in which the tax evasion occurred.
• Failure to register: Up to 15 years from the date on which the person was required to register.

The applicable calculation depends on the circumstances and the specific provisions of the Tax Procedures Law.

Does the 15-Year Window Mean Every Business Can Be Audited for 15 Years?

No.

The introduction of the extended limitation period does not mean that the FTA has a standard 15-year audit period for every taxpayer.

The ordinary five-year limitation period continues to apply in general circumstances. The longer period is linked to specific situations provided for under the law.

This distinction is important because businesses should not assume that every historical tax period will automatically remain open for 15 years.

At the same time, companies should not assume that the expiry of five years automatically eliminates every possible historical tax risk. The circumstances surrounding registration, tax compliance, disclosures, and transactions should be considered when assessing historical exposure.

What Can Increase Tax Audit Risk?

The existence of a 15-year limitation period does not mean that a company will necessarily be audited. However, weak compliance systems can increase the likelihood of tax issues being identified during an FTA review.

Examples of areas that can create tax compliance concerns include:

• Failure to register for VAT when required.
• Failure to register for Corporate Tax when required.
• Tax returns that do not reflect the underlying accounting records.
• Material differences between sales records and tax returns.
• Unexplained discrepancies between VAT and financial accounting data.
• Incorrect treatment of related-party transactions.
• Unsupported tax deductions.
• Incomplete or inaccurate invoices.
• Unreported taxable transactions.
• Repeated amendments to tax returns without adequate documentation.
• Unexplained tax credit balances.
• Transactions that are not supported by contracts or other commercial evidence.
• Inadequate accounting records.

These issues do not automatically constitute tax evasion. They are examples of areas that businesses should monitor because weak documentation and internal controls can make tax compliance more difficult to demonstrate.

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Why Tax Registration Controls Are Important

Failure to register for tax when required is specifically relevant to the extended 15-year period.

Businesses should therefore establish clear procedures for determining when tax registration becomes necessary and who is responsible for monitoring the relevant thresholds and conditions.

For VAT, companies should monitor taxable supplies and other factors relevant to VAT registration.

For Corporate Tax, companies should assess their status under the UAE Corporate Tax framework and ensure that registration requirements are addressed within the applicable deadlines.

Where a business changes its activities, legal structure, ownership, or commercial model, its tax registration position should also be reviewed.

How Should UAE Businesses Prepare for the Extended Audit Window?

The most practical response is to strengthen tax compliance and documentation rather than simply attempting to retain large quantities of records indefinitely.

A business should be able to demonstrate how it calculated its tax obligations and why its tax treatment was appropriate for significant transactions.

1. Maintain Complete Accounting Records

Accounting records should accurately reflect the company’s underlying transactions.

Businesses should maintain reliable records covering:

• Sales and revenue.
• Purchases and expenses.
• Bank transactions.
• Accounts receivable and payable.
• Fixed assets.
• Inventory, where applicable.
• Payroll.
• Loans and financing.
• Intercompany transactions.
• Related-party transactions.

These records form the foundation for tax return preparation and can also provide evidence during an FTA audit.

2. Reconcile Tax Returns With Accounting Records

Tax returns should be reconciled with the company’s accounting records before submission.

For example, VAT returns should be reviewed against sales and purchase ledgers, while Corporate Tax calculations should be reconciled with the underlying financial statements and relevant tax adjustments.

Unexplained differences should be investigated and documented before they become recurring compliance issues.

3. Review Tax Registration Status Regularly

Companies should periodically confirm that their VAT and Corporate Tax registration status remains appropriate.

This is particularly important when a company:

• Experiences significant revenue growth.
• Starts a new business activity.
• Expands into new markets.
• Changes its legal structure.
• Begins making new categories of transactions.
• Establishes related entities.
• Changes its place or nature of business operations.

4. Document Significant Tax Positions

Where a transaction involves a significant or complex tax treatment, the company should maintain documentation explaining the basis for its position.

This can include contracts, invoices, accounting treatment, tax calculations, correspondence, internal approvals, and relevant professional analysis.

The objective is to create a clear record showing how the company reached its tax position.

5. Strengthen Internal Approval Procedures

Companies should establish appropriate controls over transactions that could affect their tax position.

For example, significant related-party transactions, unusual expenses, asset disposals, cross-border transactions, and major changes in contractual arrangements should be reviewed by the appropriate finance or tax personnel.

Record Retention: Should Businesses Keep Records for More Than 7 Years?

The UAE tax framework includes record-keeping requirements that generally require taxable persons to maintain relevant books, records, and documents for at least seven years, subject to the applicable tax legislation and circumstances.

However, the existence of a potential 15-year audit window creates an important practical consideration.

Businesses that face circumstances potentially falling within an extended limitation period should consider retaining relevant documentation for longer than the ordinary seven-year retention period, particularly where the records could be important in demonstrating historical tax compliance.

This does not mean that every document generated by every business must automatically be retained for 15 years. Instead, companies should adopt a risk-based document retention policy that identifies records with continuing tax, legal, financial, and commercial relevance.

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Records Worth Considering for Longer-Term Retention

• Filed Corporate Tax returns.
• Filed VAT returns.
• Excise Tax returns, where applicable.
• Tax registration records.
• Tax deregistration records.
• Tax refund applications.
• Voluntary disclosures.
• FTA assessments and audit correspondence.
• Major tax calculations.
• Financial statements and audit reports.
• Material contracts.
• Related-party transaction documentation.
• Transfer pricing documentation, where applicable.
• Records supporting significant tax deductions.
• Documents supporting major asset acquisitions or disposals.
• Evidence supporting complex or unusual transactions.

Digital record retention should also include appropriate backup and access controls. Keeping a document for many years is of limited value if the business cannot retrieve it, verify its authenticity, or establish which version was relied upon.

Internal Controls That Can Reduce Tax Audit Exposure

Strong internal controls cannot eliminate the possibility of an FTA audit, but they can reduce the likelihood of avoidable compliance problems and make the business better prepared to respond to regulatory scrutiny.

Tax Registration Control

Assign responsibility for monitoring VAT and Corporate Tax registration requirements. Establish a documented process for reviewing registration status when the company’s revenue, activities, structure, or transaction profile changes.

Tax Return Review Control

Tax returns should ideally undergo a documented review before submission. The review should compare the tax return with the underlying accounting records and investigate significant variances.

Reconciliation Control

Regular reconciliations should be performed between accounting records, tax returns, bank records, and relevant operational systems.

Supporting Documentation Control

Companies should establish minimum documentation requirements for significant transactions and tax positions. Supporting documents should be stored in a central system that allows authorised personnel to retrieve them efficiently.

Related-Party Transaction Control

Transactions with related parties should be identified and reviewed appropriately. Businesses should maintain contracts, invoices, pricing information, accounting entries, and other supporting documentation relevant to these transactions.

Tax Error Escalation Control

Employees should have a clear process for reporting potential tax errors. Tax issues should not remain unresolved simply because the financial amount appears small.

A documented escalation process allows management to determine whether a correction, voluntary disclosure, amended return, or other action may be appropriate.

How an External Audit Can Help

A proactive external or statutory audit can provide an independent review of a company’s financial records and internal controls. While a statutory audit is not the same as an FTA tax audit, it can identify accounting and control weaknesses that may affect tax compliance.

An external audit may help identify:

• Unusual or unsupported transactions.
• Unreconciled balances.
• Revenue recognition issues.
• Unrecorded liabilities.
• Related-party transactions requiring further review.
• Weak financial controls.
• Incomplete supporting documentation.
• Differences between accounting records and supporting evidence.

Addressing these issues proactively can help improve the reliability of the financial information used to prepare tax returns.

Why Tax Audit Support Should Go Beyond the Financial Statements

Financial statements are an important source of evidence, but tax compliance involves more than the final numbers in the accounts.

Businesses should also be able to explain how transactions were recorded, why particular tax treatments were applied, and how the figures reported to the FTA reconcile with the underlying accounting records.

This is why an effective tax compliance review should consider the relationship between:

• Accounting records.
• Financial statements.
• Tax returns.
• Tax registration records.
• Contracts and commercial documents.
• Invoices and transaction records.
• Bank records.
• Related-party transactions.
• Tax calculations and adjustments.

Example: How a Historical Tax Issue Can Become Significant

Consider a hypothetical UAE company that began conducting taxable activities but did not properly assess whether it was required to register for tax. Several years later, the company discovers that its registration position may have been incorrect.

Under the ordinary five-year limitation period, the company might initially focus only on recent tax periods. However, where the circumstances fall within the statutory provision concerning failure to register, the FTA may have an extended period of up to 15 years to conduct an audit or issue an assessment.

This demonstrates why businesses should address registration questions promptly and maintain documentation showing how their tax obligations were assessed.

The example is illustrative only. Whether a particular situation falls within an extended limitation period depends on the applicable legislation and the facts of the case.

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Practical FTA 15-Year Audit Window Checklist

UAE businesses can use the following checklist as part of their tax compliance review:

• Confirm that all required tax registrations are in place.
• Review whether historical registration obligations were correctly assessed.
• Reconcile tax returns with accounting records.
• Review historical tax calculations for material errors.
• Maintain supporting documentation for significant tax positions.
• Review related-party transactions and supporting records.
• Maintain tax registration and deregistration evidence.
• Review outstanding FTA correspondence and assessments.
• Maintain records of voluntary disclosures and corrections.
• Identify historical periods that may fall within an extended limitation period.
• Consider longer retention for records associated with higher-risk tax matters.
• Test internal tax controls periodically.
• Conduct independent financial or tax compliance reviews where appropriate.

How AFD Auditors Can Help UAE Businesses Prepare

The extended audit provisions make proactive financial and tax compliance increasingly important for UAE businesses.

AFD Auditors provides statutory audit, external audit, and tax audit support for businesses in the UAE. An independent review can help management identify weaknesses in accounting records, reconciliations, documentation, and internal controls before those issues become more difficult to address.

Our audit approach can help businesses strengthen the financial information and supporting documentation used for tax compliance while identifying areas that may require further review.

For companies with complex transactions, historical tax issues, registration concerns, or significant related-party activity, a proactive review can provide an additional layer of assurance and improve readiness for potential FTA scrutiny.

Frequently Asked Questions

What is the FTA 15-year audit window in the UAE?

It is an extended limitation period under the UAE Tax Procedures Law that allows the FTA, in specified circumstances, to conduct a tax audit or issue a tax assessment up to 15 years after the relevant event. It applies particularly to tax evasion and failure to register for tax when registration was required.

Is the UAE tax audit period normally 15 years?

No. The general limitation period is five years from the end of the relevant Tax Period. The 15-year period is an exception that applies to specific circumstances established under the Tax Procedures Law.

When can the FTA use the 15-year limitation period?

The extended period applies where the statutory conditions relating to tax evasion or failure to register for tax are met. For tax evasion, the period is calculated from the end of the Tax Period in which the tax evasion occurred. For failure to register, the period is calculated from the date on which the person was required to register.

Should UAE businesses keep tax records for 15 years?

The standard tax record retention requirement is generally seven years, subject to the applicable legislation and circumstances. However, businesses facing circumstances that could result in an extended audit period should consider retaining relevant tax and financial documentation for longer, using a risk-based retention policy.

Can an external audit prevent an FTA tax audit?

No. An external or statutory audit does not prevent the FTA from conducting a tax audit. However, proactive auditing can help identify accounting errors, control weaknesses, documentation gaps, and unusual transactions that may affect tax compliance.

Does the 15-year window apply to every UAE tax?

The Tax Procedures Law provides procedural rules applicable to UAE federal taxes. The specific implications depend on the relevant tax, the taxpayer’s circumstances, and the conditions established under the legislation.

Conclusion

The introduction of the extended 15-year audit window under Federal Decree-Law No. 17 of 2025 highlights the importance of maintaining strong tax compliance systems in the UAE.

The ordinary five-year limitation period remains the general rule. However, businesses that fail to register for tax when required or become involved in circumstances falling within the tax evasion provisions can face a significantly longer period of potential FTA audit and assessment exposure.

Businesses should therefore focus on prevention and preparedness. Regular tax registration reviews, accurate accounting records, reconciliations, documented tax positions, appropriate internal controls, and well-organised historical records can all contribute to stronger tax compliance.

Although the standard record retention period is generally seven years, businesses with potential exposure to an extended limitation period should consider whether relevant records need to be retained for longer. A risk-based approach can help preserve important evidence without requiring every business document to be stored indefinitely.

Finally, proactive external and statutory audits can provide an independent review of financial records and controls. While they do not replace an FTA tax audit, they can help businesses identify and correct weaknesses before those weaknesses result in more serious compliance concerns.

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