Corporate Tax UAE, FTA Penalties & Fines, Insights

UAE Corporate Tax First Tax Period 2026: The 18-Month Rule

UAE corporate tax first tax period infographic showing it begins on or after 1 June 2023, runs 6 to 18 months, file within 9 months

13 min read

What Is Your First Tax Period Under UAE Corporate Tax?

Your first tax period is your company’s first financial year that begins on or after 1 June 2023, and it can legally run anywhere from 6 to 18 months, not just 12. Under Article 57 of Federal Decree-Law 47 of 2022, this single date range sets your registration deadline, your filing deadline, and even whether you keep Small Business Relief.

The UAE corporate tax first tax period is the most misunderstood date in the whole regime, and getting it wrong is exactly what triggers the AED 10,000 late registration penalty and AED 500 per month late filing fines. A tax period is simply the window of profit your return covers. For most established companies it is a normal 12 months, but for a business set up in 2024 or 2025 it can be a long 16 to 18 month period or a short 7 to 10 month one. Qaspro Global sees first-time filers calculate their deadline from the wrong start date every week, so this guide breaks down the rule exactly as the Federal Tax Authority (FTA) wrote it.

When Does the First Tax Period Start?

Your first tax period starts with the first financial year that begins on or after 1 June 2023, because Article 69 of Federal Decree-Law 47 of 2022 states that corporate tax applies only to tax periods commencing on or after that date. Any financial year that started before 1 June 2023 is outside corporate tax entirely.

Article 57 defines a tax period as the financial year, or part of it, for which a return must be filed. Your financial year is either the Gregorian calendar year (1 January to 31 December) or the 12-month period for which you prepare your financial statements. This is why two companies on different year-ends have completely different first tax periods even though the law started on the same day.

Key point: A calendar-year company that was already trading before June 2023 had its first tax period run 1 January 2024 to 31 December 2024. That period’s return was due 30 September 2025. The year ending 31 December 2025 is that company’s second tax period, with a return due 30 September 2026.

Can Your First Tax Period Really Be 18 Months?

Yes. For a newly incorporated company, the first tax period follows the first financial year permitted under the UAE Commercial Companies Law, which can be any period between 6 months and 18 months. The FTA confirmed this directly in Public Clarification CTP003 on the First Tax Period, stating that a period between 6 and 18 months followed by the taxable person under the Commercial Companies Law is accepted.

This matters because a company set up part-way through a year does not have to break its accounts into an awkward stub period. If you incorporated on 10 March 2025, you can run your first accounts all the way to 31 December 2026, a 22-month stretch, except that 22 months breaks the 18-month ceiling. So you would instead close your first financial year by, say, 30 June 2026, giving a legal 16-month first tax period. The flexibility is real, but the 18-month cap is hard.

How Do You Find Your Own First Tax Period?

You find your first tax period by identifying your financial year and then taking the first one that begins on or after 1 June 2023. The table below shows the four situations Qaspro Global encounters most often, with real dates so you can match your own business.

Your situation	First financial year	First tax period	Register by	File and pay by
Calendar-year company (Jan to Dec) trading before June 2023	1 Jan 2024 to 31 Dec 2024	1 Jan 2024 to 31 Dec 2024 (12 months)	By licence-issue month in 2024	30 Sep 2025
Company with a June to May year, trading before June 2023	1 Jun 2023 to 31 May 2024	1 Jun 2023 to 31 May 2024 (12 months)	By licence-issue month in 2024	28 Feb 2025
New company incorporated 10 Mar 2025, first accounts to 31 Dec 2025	10 Mar 2025 to 31 Dec 2025	Same (about 10 months, allowed)	9 Jun 2025	30 Sep 2026
New company incorporated 10 Mar 2025, long first accounts to 30 Jun 2026	10 Mar 2025 to 30 Jun 2026	Same (about 16 months, allowed)	9 Jun 2025	31 Mar 2027

Notice that the two new companies share the same incorporation date but file almost a year apart. The length of the first financial year you choose decides your entire deadline chain. If you want to move your year-end after incorporation, you must apply to the FTA to change your tax period under Article 58, which is a formal request, not a free choice each year. See our guide on how to change your fiscal year for UAE corporate tax before you assume you can switch.

Why Can a Longer First Tax Period Cost You Small Business Relief?

A longer first tax period can push you over Small Business Relief because the FTA does not pro-rate the AED 3 million revenue cap for periods longer than 12 months. CTP003 is explicit: if the first tax period is longer or shorter than 12 months, there is no pro-rating of the various thresholds prescribed under the Corporate Tax Law. An 18-month period still squeezes all its revenue under the same AED 3 million ceiling.

Picture a startup with revenue of AED 200,000 per month. Over a normal 12-month year that is AED 2.4 million, comfortably under the AED 3 million cap, so it elects Small Business Relief and pays zero corporate tax. Run an 18-month first period instead and revenue becomes AED 3.6 million, which blows past the cap. The same business, taxed on the same monthly performance, loses its relief purely because of the period length. The AED 375,000 zero-rate band in Article 3 is treated the same way and is not stretched for a long period either.

Threshold	Pro-rated for a long or short first period?	Source
AED 3 million Small Business Relief revenue cap	No, it stays AED 3 million	CTP003 and Ministerial Decision 73 of 2023
AED 375,000 zero-rate band	No, it stays AED 375,000	CTP003 and Article 3, FDL 47 of 2022
AED 12 million interest de minimis (Article 30)	Yes, adjusted proportionally	CTP003 and Ministerial Decision 126 of 2023

Which Threshold IS Pro-Rated for a Long First Period?

The only threshold that is pro-rated is the AED 12 million de minimis limit under the General Interest Deduction Limitation Rule. CTP003 names it as the single exception, so for a 16-month first tax period the AED 12 million safe harbour scales up to roughly AED 16 million, giving you more room to deduct net interest before the 30 percent EBITDA cap bites.

This is a rare case where a longer first period helps rather than hurts, and it matters most to companies carrying bank loans or shareholder financing. If interest is a large cost for your business, read our breakdown of the 30 percent EBITDA interest deduction rule alongside this clarification so you plan the period length deliberately rather than by accident.

What Are the First Tax Period Registration Deadlines?

Registration deadlines are set by FTA Decision 3 of 2024, not by your tax period end, and missing them is what triggers the AED 10,000 penalty under Cabinet Decision 75 of 2023. The deadline depends on whether you existed before 1 March 2024 and on your licence-issue month, so the table below covers the main categories.

Taxable person	Registration deadline
Resident company licensed before 1 March 2024	By month of licence issuance, from 31 May 2024 to 31 Dec 2024
Resident company incorporated on or after 1 March 2024	3 months from the date of incorporation
Foreign-incorporated company managed and controlled in the UAE	3 months from the end of its financial year
Natural person with turnover above AED 1 million in a calendar year	31 March of the following year
Non-resident with a permanent establishment from 1 March 2024	6 months from the date the establishment began

Registration is a one-time step that must be done on EmaraTax regardless of how long your first tax period is. A natural person crossing the AED 1 million turnover line follows a different clock; our guide on corporate tax for individuals explains that AED 1 million rule in full.

When Must You File and Pay for Your First Tax Period?

You must file your first corporate tax return and pay any tax due within 9 months of the end of your first tax period, under Articles 53 and 48 of Federal Decree-Law 47 of 2022. There is no separate, earlier payment date in the UAE system, so the filing deadline and the payment deadline are the same day.

This 9-month rule is why the period-end date matters so much. A first tax period ending 31 December 2025 gives a filing and payment deadline of 30 September 2026. A first tax period ending 30 June 2026 pushes the deadline to 31 March 2027. There is also a powerful incentive to file early: if you submit your first return within 7 months of the end of your first tax period, the FTA waives or refunds the AED 10,000 late registration penalty under the relief announced on 29 April 2025. For a first tax period ending 31 December 2025, that 7-month window closes on 31 July 2026. We cover that relief step by step in our guide to the AED 10,000 registration penalty waiver.

What Happens If You Get Your First Tax Period Wrong?

Getting your first tax period wrong exposes you to three separate penalties under Cabinet Decision 75 of 2023. They stack, so a single miscalculated start date can cost tens of thousands of dirhams across registration, filing, and payment.

Late registration: a fixed AED 10,000 penalty if you register after your FTA Decision 3 of 2024 deadline.
Late filing: AED 500 for each month, or part of a month, for the first 12 months, then AED 1,000 per month after that.
Late payment: a monthly penalty charged at an annual rate of 14 percent on unpaid corporate tax, applied from the day after the deadline.

Even a company with zero profit, a loss, or full Small Business Relief still has to file. A missed nil return carries the same AED 500 per month fine, which is why we wrote a dedicated guide on the nil corporate tax return. To see the full penalty schedule, our UAE corporate tax penalties guide lists every FTA fine and how to avoid it.

The first return also carries the once-only realisation basis election on unrealised gains, which is irrevocable, so handle both in the same filing.

Frequently Asked Questions

What is the first tax period for UAE corporate tax?

The first tax period is your first financial year that begins on or after 1 June 2023, as defined by Articles 57 and 69 of Federal Decree-Law 47 of 2022. For a calendar-year company trading before that date it was 1 January 2024 to 31 December 2024. For a new company it follows the first financial year under the Commercial Companies Law.

Can the first tax period be more than 12 months in the UAE?

Yes. FTA Public Clarification CTP003 confirms a first tax period can run between 6 and 18 months where that is the first financial year a newly incorporated company adopts under the Commercial Companies Law. It cannot exceed 18 months or fall below 6 months.

Does a long first tax period reduce my Small Business Relief threshold?

No, but it works against you. The AED 3 million Small Business Relief cap is not pro-rated for a longer period, so an 18-month first tax period must still keep total revenue under AED 3 million to qualify. More months of trading under the same cap makes the relief easier to lose.

When is the first corporate tax return due?

Your first corporate tax return is due within 9 months of the end of your first tax period, under Article 53. A period ending 31 December 2025 has a filing and payment deadline of 30 September 2026. The payment deadline under Article 48 is the same day.

What is the first tax period for a company set up in 2025?

It is the first financial year you adopt from your date of incorporation, which can be 6 to 18 months long. A company incorporated on 10 March 2025 could run its first period to 31 December 2025 or extend it to a later date within 18 months. It must register within 3 months of incorporation.

Is the AED 375,000 zero-rate band pro-rated for a short first period?

No. The AED 375,000 zero-rate band under Article 3 of Federal Decree-Law 47 of 2022 stays at AED 375,000 regardless of whether your first tax period is shorter or longer than 12 months. CTP003 confirms thresholds are not pro-rated, with the single exception of the AED 12 million interest de minimis limit.

Do free zone companies have a different first tax period?

No, the same rule applies. A Qualifying Free Zone Person determines its first tax period from its first financial year on or after 1 June 2023 and must still register and file on time even though qualifying income is taxed at 0 percent. Filing is mandatory for every registered business.

Can I change my first tax period after registering?

You can apply to the FTA to change your tax period under Article 58 of Federal Decree-Law 47 of 2022, subject to conditions. It is a formal application, not an automatic right, and it is usually used to align a year-end with a parent company or a tax group. You cannot simply pick a new period each year.

Does an individual freelancer have a first tax period?

Yes, if their business turnover exceeds AED 1 million in a Gregorian calendar year. Under Cabinet Decision 49 of 2023 the first tax period for a natural person is that calendar year, and they must register by 31 March of the following year. Salary, personal investment income, and personal real estate are excluded from the turnover test.

Need Expert Help?

Qaspro Global, a UAE-based tax and accounting consultancy, helps businesses pin down their exact first tax period, register on EmaraTax before the deadline, and file a clean first return that protects Small Business Relief and avoids the AED 10,000 penalty. Contact us today for a free consultation before your first corporate tax deadline arrives.