Corporate Tax

UAE Corporate Tax Deadlines & Registration Timeline

2025-12-22 · 5 min read · By Aureus Worldwide

Missing a Corporate Tax deadline is one of the easiest, and most expensive, mistakes a UAE business can make. This guide maps the registration timeline and the filing and payment windows so nothing slips.

Your financial year drives everything

Almost every Corporate Tax deadline is calculated from your tax period, which is normally your financial year. Two businesses with different year-ends will have different deadlines, so the first step is to confirm your financial year and apply the rules to your dates rather than generic ones.

The Corporate Tax registration timeline

Every taxable person must register with the Federal Tax Authority (FTA) and obtain a Corporate Tax registration number, even if you expect to pay 0%. The FTA set registration deadlines that depend on factors such as:

• The month your trade licence was issued (for many existing entities)
• Whether you are a juridical or natural person
• When a newly incorporated entity came into existence
• Whether you are a resident or non-resident person

Because these deadlines vary and have shifted over time, check the current FTA timeline for the deadline that applies to your specific entity. Late registration carries an administrative penalty that is entirely avoidable.

The filing and payment window

Once registered, the recurring obligation is a single annual Corporate Tax return:

So a company with a financial year ending 31 December 2024 would generally have until 30 September 2025 to file and pay. A company with a 30 June 2025 year-end would generally have until 31 March 2026. Confirm your exact date with the FTA.

Worked timeline example

For a December year-end company in its first full taxable year:

1. Year-end, 31 December
2. Prepare financial statements, January to March
3. Compute taxable income, adjust accounting profit for tax rules
4. File and pay, by 30 September (9 months later)

Leaving the computation until month eight or nine is risky; reliefs, elections and transfer pricing documentation all take time to get right.

The 9-month window sounds generous, but audit, accounts preparation and tax adjustments eat it quickly. Treat the deadline as the end of the process, not the start.

Don't forget elections and one-off dates

Some decisions are time-bound and easy to miss:

• The Small Business Relief election is made in the return for the relevant period, see our Small Business Relief guide
• Transfer pricing disclosures accompany the return
• Group formation and certain reliefs have their own conditions and timing
• Deregistration (for example, on cessation) has its own deadline

Changing your financial year

Some businesses consider changing their financial year-end, for example, to align a subsidiary with a parent or to smooth a seasonal trading pattern. Because the Corporate Tax period follows the financial year, any change directly shifts your registration baseline and your filing and payment deadlines, and it may create a longer or shorter transitional period. A change is subject to conditions and cannot be used simply to defer tax indefinitely. If you are weighing a change, map the new deadlines carefully and confirm the conditions with the FTA before acting, so you do not inadvertently miss a filing during the transition.

VAT vs Corporate Tax deadlines

Do not confuse the two regimes. VAT returns are usually quarterly or monthly; Corporate Tax is an annual return due nine months after year-end. A combined compliance calendar prevents one regime's deadline from masking the other's. Our VAT compliance guide covers the VAT side in detail.

A simple compliance calendar

• Record your financial year-end and registration deadline
• Diarise the CT filing and payment date (year-end + 9 months)
• Add VAT return dates (monthly or quarterly)
• Schedule accounts preparation to finish well before the CT deadline
• Note any election or relief deadlines for the period
• Build in time for audit where applicable, see our audit guide

First tax period and short periods

A common point of confusion is the first tax period, especially for newly incorporated companies or those transitioning into the regime. Your first period follows your first financial year, which may not be a neat twelve months, a company incorporated mid-year might have a longer or shorter first period depending on its accounting reference date. The nine-month filing window still runs from the end of that period, so identify your exact first year-end early. Getting the first period right also sets the baseline for opening balances, tax depreciation and any transitional rules that apply, so it is worth confirming with the FTA rather than assuming a standard calendar year.

Penalties and how to avoid them

The FTA applies administrative penalties for failing to register on time, for late filing, and for late payment of Corporate Tax, with further consequences for inaccurate returns. These are entirely avoidable with basic planning. The most reliable protection is to work backwards from your filing deadline: fix the dates for completing the accounts, finishing the tax computation, reviewing elections, and submitting the return, each with a comfortable buffer. If you realise you have missed something, act quickly, a prompt voluntary correction is generally treated more favourably than an error the FTA discovers later. Confirm current penalty amounts with the FTA.

How Aureus Worldwide helps

Aureus Worldwide keeps UAE businesses ahead of every Corporate Tax deadline, confirming your registration date, building a compliance calendar, preparing return-ready accounts, and filing on time through our tax and accounting teams. We help you claim the right elections before the window closes and avoid late penalties. To map your Corporate Tax deadlines, contact our advisors.

Talk to our chartered accountants →