If your UAE company is part of a large international group, the 9% corporate tax rate is no longer the end of the story. The Federal Tax Authority has opened registration on EmaraTax for the Domestic Minimum Top-Up Tax, and every UAE entity inside an in-scope group has to sign up. The first return is not due until 2027, but the modelling that decides how much you owe starts with this financial year.
TL;DR: The UAE's Domestic Minimum Top-Up Tax (DMTT) sets a 15% minimum effective tax rate for UAE members of multinational groups with global revenue of EUR 750 million or more. It applies to financial years starting on or after 1 January 2025. Registration is open on EmaraTax now. For a 31 December 2025 year end, the first top-up return is due by 30 June 2027.
What Is the UAE Domestic Minimum Top-Up Tax?
The DMTT is a top-up charge that lifts a large group's effective tax rate in the UAE to a floor of 15%. It sits on top of the standard 9% corporate tax and only bites where a group's UAE tax bill falls below that floor. The rules apply to financial years starting on or after 1 January 2025 (UAE Ministry of Finance).
The measure is the UAE's version of the OECD Pillar Two global minimum tax. It was enabled through Federal Decree-Law No. 60 of 2023, with the detailed rules set out in Cabinet Decision No. 142 of 2024, released by the Ministry of Finance on 11 February 2025 (EY). The UAE chose to adopt the domestic top-up charge but has not applied the Income Inclusion Rule, so the obligation falls on UAE entities rather than a foreign parent (UAE Ministry of Finance).
Who Is Caught by the 15% DMTT?
You are in scope if your UAE entity belongs to a multinational group with consolidated annual revenue of EUR 750 million or more in at least two of the four financial years before the year the DMTT applies (UAE Ministry of Finance). That is roughly US$857 million, so this is a big-group rule, not an SME one.
Scope reaches wider than most directors expect. It covers UAE subsidiaries, free zone entities, joint ventures, and permanent establishments of a foreign group (Middle East Briefing, 2026). What we see most often is a UAE free zone company assuming its 0% qualifying status keeps it clear. It does not. A free zone entity earning qualifying income at 0% is still a constituent entity, and if the wider group crosses EUR 750 million, that 0% rate is exactly what triggers a top-up. Small standalone businesses under the revenue threshold, including those relying on Small Business Relief, are outside these rules entirely.
How the Top-Up Tax Actually Works
The DMTT compares your group's effective tax rate in the UAE against the 15% floor. If UAE profits are taxed below 15%, a top-up charge makes up the difference so the effective rate reaches 15% (EY). The effective rate is not the headline 9%. It is calculated on GloBE income, the OECD's global anti-base-erosion measure of profit, so exemptions, free zone relief, and timing differences all push the real rate around.
This is where the risk sits for groups with UAE operations paying little or no local tax. A holding structure taking dividends under the participation exemption, or a free zone trading arm on 0%, can show a UAE effective rate well below 15%. In our experience the groups most exposed are those that built their UAE footprint around free zone incentives. The incentives still work for standard corporate tax, but Pillar Two now measures the group as a whole and claws back the gap to 15%.
When Do You Need to Register and File?
Registration is open on EmaraTax now, and every in-scope UAE constituent entity has to register (Middle East Briefing, 2026). The FTA has not yet set a hard registration deadline, but leaving it open is not a strategy. Outside the relief window covered below, failing to register or file falls under the standard corporate tax penalty regime.
Filing runs on its own clock, separate from your normal corporate tax return. A top-up tax return is due within 15 months of the financial year end, extended to 18 months for the transitional first year. For a group with a 31 December 2025 year end, that first DMTT return lands on 30 June 2027 (Middle East Briefing, 2026). That is a full nine months after the 30 September 2026 corporate tax filing deadline for the same period, so do not assume the two are handled together.
What About the Penalty Relief Window?
There is transitional breathing room. No penalties apply to the top-up tax return or the information return for fiscal periods beginning on or before 31 December 2026, provided the period does not end after 30 June 2028 and the group has taken reasonable measures to apply the rules correctly (Middle East Briefing, 2026).
Read the conditions carefully. The relief covers filing, not payment. If a genuine top-up liability is due, late payment of that amount still attracts penalties. There are also transitional safe harbours based on Country-by-Country Reporting for fiscal years starting before 1 January 2027 and not ending after 30 June 2028 (EY). A separate exclusion can reduce the top-up to zero during a group's initial phase of international activity, where it operates in no more than six jurisdictions and holds net tangible assets of no more than EUR 50 million outside its reference jurisdiction, for up to five years (EY).
What Should In-Scope Groups Do Now
Start with the threshold test. Confirm whether the group crossed EUR 750 million in two of the four preceding years, because that single fact decides whether any of this applies to your UAE entities. If it does, register on EmaraTax and map every UAE constituent entity, including dormant and free zone ones.
Then model the UAE effective tax rate under the GloBE method, not the 9% headline. One question clients always ask is whether their free zone 0% status protects them, and the honest answer is that it may be the very thing creating a top-up. Where the numbers or the group structure are unclear, it is worth getting an advance answer from the FTA rather than guessing. Documenting the "reasonable measures" you took to apply the rules is what keeps you inside the penalty relief window while the detail settles.
Frequently Asked Questions
Does the DMTT apply to UAE free zone companies?
Yes, if the free zone company is part of a group that meets the EUR 750 million threshold. Qualifying free zone status gives a 0% corporate tax rate, but that low rate is exactly what can pull the group's UAE effective rate below 15% and trigger a top-up. Free zone entities must register alongside mainland ones.
Is my SME affected by the top-up tax?
No. The DMTT only applies to members of multinational groups with consolidated global revenue of EUR 750 million or more in two of the four preceding financial years. A standalone UAE business, or one below that group threshold, stays on the standard corporate tax rules and is not in scope.
Does the UAE apply the Income Inclusion Rule?
Not currently. The UAE has adopted the Domestic Minimum Top-Up Tax but has not applied the Income Inclusion Rule (UAE Ministry of Finance). That means the UAE collects the top-up on locally low-taxed profits itself, rather than a foreign parent jurisdiction collecting it.
When is my first top-up tax return due?
A DMTT return is due within 15 months of the financial year end, or 18 months for the transitional first year. For a group with a 31 December 2025 year end, that first return is due by 30 June 2027. Registration on EmaraTax should be completed well ahead of that.
What happens if we do not register?
Registration is mandatory for in-scope UAE entities. The FTA has not set a fixed registration deadline yet, but outside the transitional penalty relief window, non-compliance is dealt with under the UAE corporate tax penalty regime. Leaving registration open exposes the group to those penalties once the relief period ends.
Not sure whether your group crosses the EUR 750 million threshold or how your free zone entities affect the calculation? Get in touch and we will run the scope test, model your UAE effective tax rate under the Pillar Two method, and handle the EmaraTax registration so nothing slips before the relief window closes.