GCC Minimum Top-Up Tax (DMTT) Explained

What the GCC's domestic minimum top-up tax is

A domestic minimum top-up tax (DMTT) is a 15% minimum effective tax rate that a country charges on the local profit of a very large multinational group, topping up whatever the group already pays locally to reach 15% if it falls short. It matters because it is the Gulf's local implementation of the OECD's global Pillar Two framework, and, as of September 2026, it is already law and already effective in the UAE, Kuwait and Bahrain.

This guide covers who the DMTT catches, why the overwhelming majority of Gulf businesses sit outside it entirely, what each of the UAE, Kuwait and Bahrain has legislated, a worked example of how a top-up is calculated, and where Qatar and Oman stand as of this research.

Who is in scope: the EUR 750 million test

Every DMTT law confirmed in this guide uses the same scope test, taken directly from the OECD's Pillar Two design: a multinational group is in scope if its consolidated global revenue reached EUR 750 million or more in at least 2 of the preceding 4 financial years. The test looks at the group's worldwide revenue, not its revenue in any single Gulf country, and not its profit.

Once a group is in scope, the 15% minimum effective tax rate is then tested separately in each jurisdiction where it has a constituent entity. A group can be well above the EUR 750 million line globally and still owe no top-up tax in a specific Gulf country, if its effective tax rate there already reaches 15% through ordinary local taxes.

A group headquartered outside the Gulf with, say, EUR 1.2 billion of consolidated global revenue clears the threshold easily and needs to check every Gulf country where it has even a small local entity. A Gulf-based group with EUR 400 million of global revenue, however large it feels regionally, stays below the EUR 750 million line entirely and owes no DMTT anywhere, in any of the countries covered in this guide.

Why most SMEs are out of scope entirely

EUR 750 million of consolidated global revenue is a very high bar, one that only a few hundred of the world's largest corporate groups clear. A locally owned Gulf trading business, a family-owned group operating across two or three GCC countries, or a mid-sized regional group with revenue in the tens or low hundreds of millions of euros, sits nowhere near this threshold, however substantial it feels by local standards.

The practical effect is that DMTT is not a general business tax in the way VAT or a standard corporate income tax is: it is a narrow backstop aimed specifically at the largest multinational groups, and the vast majority of businesses reading this guide can confirm they are out of scope simply by checking their group's consolidated global revenue against the EUR 750 million figure.

The UAE's domestic minimum top-up tax

The UAE's DMTT, implementing OECD Pillar Two, applies the 15% minimum effective tax rate to UAE constituent entities of in-scope multinational groups, under Cabinet Decision No. 142 of 2024. It is effective for financial years beginning on or after 1 January 2025, running alongside, not instead of, the UAE's standard 9% corporate tax on income above AED 375,000.

A UAE constituent entity of an in-scope group therefore has to track two separate tax computations in parallel: its ordinary corporate tax liability at 9%, and its DMTT position once the group's global revenue crosses the EUR 750 million test. The 9% domestic rate already covers a meaningful part of the 15% minimum, which typically leaves a smaller top-up in the UAE than in a country with no general corporate tax at all.

Kuwait's domestic minimum top-up tax

Kuwait's DMTT, under Decree-Law No. 157 of 2024, published 30 December 2024, is effective for financial years starting on or after 1 January 2025: a 15% top-up applies to in-scope multinational groups whenever Kuwait's effective tax rate for that group falls below 15%. Executive Regulations, Ministerial Resolution No. 55 of 2025, were published on 30 June 2025, largely aligned with the OECD's GloBE Model Rules.

Kuwait's DMTT stands out because of what it sits alongside: Kuwait has no general corporate income tax on Kuwaiti-owned companies and no VAT at all, with VAT excluded from the current government's four-year economic plan in favour of the DMTT and proposed excise taxes. A large in-scope multinational group can therefore face a 15% minimum in Kuwait even though most domestic Kuwaiti businesses around it pay no general corporate tax or VAT whatsoever.

Bahrain's domestic minimum top-up tax and its registration deadline

Bahrain's DMTT, under Decree-Law No. 11 of 2024, applies the same 15% minimum effective tax rate to in-scope constituent entities for financial years starting on or after 1 January 2025, administered by Bahrain's National Bureau for Revenue (NBR). Like Kuwait, Bahrain otherwise has no general corporate income tax, only the 46% hydrocarbon-sector tax and a still-draft general corporate income tax law, so the DMTT is again a narrow overlay on a country that does not broadly tax domestic company profit.

Where a group has multiple constituent entities in Bahrain, it must appoint a single Filing Constituent Entity to handle registration, advance payment, return filing and ongoing compliance. That Filing Constituent Entity must register within 120 days of the start of the group's transition year, or within 30 days of the DMTT Law's 1 January 2025 effective date if the group had already met the revenue test by then. The NBR published its 'Guide to the Scope of the DMTT Law and Registration Requirements', version 1.1, on 1 December 2025.

A worked example: how a top-up is calculated

A multinational group with EUR 900 million of consolidated global revenue, comfortably above the EUR 750 million threshold, operates a subsidiary in Bahrain that reports GloBE (Pillar Two) income of EUR 10,000,000 for the year. Because Bahrain has no general corporate income tax on this kind of business, the subsidiary's local effective tax rate works out at an illustrative 3%.

The DMTT tops that rate up to the 15% minimum: the top-up is the 12-percentage-point shortfall applied to the EUR 10,000,000 of GloBE income, giving additional tax of EUR 1,200,000 payable locally in Bahrain. If the same subsidiary's effective rate had already reached 15% through other local taxes, no top-up would be due at all; the DMTT only bites on the shortfall below 15%, never on top of it.

The same group's UAE subsidiary reports GloBE income of EUR 6,000,000 for the year and already pays an effective rate of 9% locally through the UAE's standard corporate tax. The shortfall to the 15% minimum is only 6 percentage points here, giving a UAE top-up of EUR 360,000, materially smaller than the Bahrain figure above because the UAE's own corporate tax already covers more of the 15% minimum before any top-up applies.

• Bahrain: GloBE income 10,000,000 x 12% shortfall = 1,200,000 top-up
• UAE: GloBE income 6,000,000 x 6% shortfall = 360,000 top-up
• Local effective tax rate before top-up: Bahrain 3% (illustrative), UAE 9% (standard rate)
• Rule: the DMTT only charges the shortfall below 15%, never anything once local tax already reaches 15%

Qatar and Oman: unconfirmed as of September 2026

This research did not find a confirmed, legislated domestic minimum top-up tax for either Qatar or Oman as of September 2026, in contrast to the UAE, Kuwait and Bahrain positions set out above. That is not the same as confirming either country has decided against a DMTT; it simply reflects what could be verified from official and reputable sources at the time of writing.

A large multinational group with a Qatari or Omani constituent entity, and consolidated global revenue near or above the EUR 750 million threshold, should confirm the current position directly with Qatar's General Tax Authority or the Oman Tax Authority rather than assume either country's treatment from this guide or from its Gulf neighbours.

What a large group operating across the Gulf should do

A group that clears the EUR 750 million global revenue test needs to work jurisdiction by jurisdiction, not treat the Gulf as one DMTT regime. Each country legislates, administers and sets its own registration and filing mechanics separately, even where the headline 15% rate and the EUR 750 million scope test are shared, and, as the worked examples above show, the size of the actual top-up can differ sharply between one Gulf country and the next depending on what local tax the entity already pays.

• Confirm consolidated global group revenue against the EUR 750 million test for at least 2 of the last 4 financial years
• Check each Gulf country where the group has a constituent entity separately, since scope is global but the top-up is calculated and paid locally
• In Bahrain, appoint and register a single Filing Constituent Entity within the 120-day or 30-day deadline described above
• In Kuwait, review the Ministerial Resolution No. 55 of 2025 Executive Regulations against the group's own GloBE computations
• Treat Qatar and Oman as open questions requiring direct confirmation, not as automatically DMTT-free
• Coordinate DMTT compliance with the group's ordinary corporate tax filings in each country, since the two run alongside each other, not instead of one another

GCC DMTT and Skyline Nexus ERP

Automated DMTT registration and return filing for Bahrain, Kuwait and the UAE is being rolled out market by market: tell us your country and we will confirm your go-live date. DMTT scope and GloBE income calculations sit with a group's tax advisers; Skyline Nexus ERP does not calculate Pillar Two GloBE income or the top-up tax itself.

What Skyline Nexus ERP does provide is the underlying bookkeeping infrastructure a group needs to gather the local numbers its DMTT filings depend on. Its Consolidation module lets a business group snapshot each member business's trial balance, translated to a group base currency, with intercompany balances eliminated, which is the kind of entity-by-entity financial data a group needs on hand before its tax advisers turn it into a GloBE computation. Each member business can still invoice and record its own purchases in its local currency day to day, while the group-level Consolidation Dashboard gives finance leadership the cross-entity view that a DMTT review, jurisdiction by jurisdiction, ultimately starts from.