The Federal Tax Authority quietly opened a significant door last week. As of 29 May 2026, the DMTT registration channel on EmaraTax is operational.
For multinational groups with a UAE presence, this is not a future planning item anymore. It is a live compliance obligation.
A QUICK RECAP OF WHERE WE ARE
The UAE introduced its Domestic Minimum Top-up Tax under Cabinet Decision No. 142 of 2024, effective for financial years starting on or after 1 January 2025. The framework aligns with the OECD’s GloBE Model Rules and imposes a 15% minimum effective tax rate on MNE groups with consolidated global revenues exceeding EUR 750 million.
Critically, the UAE’s DMTT has since been confirmed as a Qualifying DMTT by the OECD, which means any top-up tax paid in the UAE is creditable against Income Inclusion Rule liabilities in the parent jurisdiction. No double taxation.
WHAT THE REGISTRATION OPENING MEANS IN PRACTICE
Until now, one of the outstanding questions was when and how DMTT registration would work. That uncertainty is resolved.
Each UAE Constituent Entity, including Free Zone entities, that forms part of an in-scope MNE Group is required to register separately, or the group must designate a single Domestic Designated Filing Entity to coordinate filings. The joint and several liability provision in the legislation means this is not a decision that can be delegated informally.
THE FIRST FILING DEADLINE AND THE PENALTY WINDOW
For calendar year groups, FY2025 is the first in-scope period. The transitional 18-month window means the first Top-up Tax Return is due by 30 June 2027.
There is a penalty grace period, no sanctions apply for FY periods beginning on or before 31 December 2026 (not ending after 30 June 2028) where the group demonstrates reasonable measures toward compliance. But this protection requires evidence. Groups that engage advisors, conduct a scoping analysis and begin data capture will be in a defensible position. Groups that do nothing will not.
THE QUESTION MOST GROUPS ARE GETTING WRONG
Many businesses are treating the Transitional CbCR Safe Harbour as a reason to delay. It is not.
The Safe Harbour, whether De Minimis, Simplified ETR, or Routine Profits, reduces or eliminates the top-up tax liability. It does not eliminate the registration and filing obligation. These are separate tracks.
WHERE THINGS GET MORE COMPLEX
There are several layers to this that I see being overlooked in standard assessments, particularly around how UAE CT taxable income interacts with GloBE Income mechanics, how Substance-based Income Exclusions apply at transitional rates, and how Covered Taxes are identified for UAE Constituent Entities that earn cross-border income subject to foreign withholding taxes.
These are not straightforward reconciliations, and the data requirements are material.
If you would like to discuss the DMTT position for your group, whether that is a scoping assessment, registration support, or a full GloBE ETR calculation , feel free to reach out directly.
