Pillar Two Global Minimum Tax Singapore: MTT, DTT Registration and What MNE Groups Must Do in 2026
Large multinational enterprise (MNE) groups operating in or through Singapore are now subject to a minimum effective tax rate of 15% under Pillar Two of the OECD’s BEPS 2.0 initiative.
Singapore implemented this through the Multinational Enterprise (Minimum Tax) Act (MMT Act), which introduced two new taxes: the Multinational Enterprise Top-up Tax (MTT) and the Domestic Top-up Tax (DTT). Both apply from financial years beginning on or after 1 January 2025.
For MNE groups with a 31 December 2025 financial year-end, the registration deadline with IRAS is 30 June 2026. Failure to register by this date may attract a 10% surcharge on any top-up tax payable.
This guide explains how Pillar Two applies in Singapore, which MNE groups are in scope, what registration involves, and how to prepare your group for compliance.
What Is the OECD Pillar Two Global Minimum Tax?
Pillar Two is one component of the OECD’s Base Erosion and Profit Shifting (BEPS) 2.0 framework. Its objective is to ensure that large MNE groups pay a minimum effective tax rate (ETR) of 15% on profits in every jurisdiction where they operate.
The rules are based on the Global Anti-Base Erosion (GloBE) Model Rules, which calculate the ETR of each Constituent Entity within an MNE group on a jurisdictional basis. Where a jurisdiction’s ETR falls below 15%, a top-up tax is charged to bring the group’s rate up to the minimum.
More than 140 countries participated in the OECD agreement. Singapore, as a major regional financial and business hub, has adopted Pillar Two to maintain its standing as a compliant and transparent tax jurisdiction while continuing to offer competitive incentives for substantive operations.
Singapore's Implementation: MTT and DTT Framework
Singapore has implemented Pillar Two through two distinct top-up taxes under the MMT Act:
1. Multinational Enterprise Top-up Tax (MTT)
The MTT is based on the Income Inclusion Rule (IIR). It applies to the low-taxed profits of group entities located outside Singapore, where the Singapore entity is the Ultimate Parent Entity (UPE) or an Intermediate Parent Entity (IPE) of those low-taxed entities.
In simple terms, if a subsidiary of your Singapore-headed group pays less than 15% effective tax in another jurisdiction, Singapore can collect a top-up tax from the Singapore parent entity to bring the group’s total rate to 15%.
2. Domestic Top-up Tax (DTT)
The DTT is Singapore’s Qualified Domestic Minimum Top-up Tax (QDMTT). It applies to the low-taxed profits of group entities located within Singapore, allowing Singapore itself to collect any top-up tax arising from Singapore operations before another jurisdiction does so under a foreign IIR.
The DTT is designed to protect Singapore’s tax base. It ensures that if a Singapore entity has an effective tax rate below 15%, Singapore — rather than a foreign government — collects the difference.
3. GloBE Information Return (GIR)
In addition to the MTT and DTT, in-scope MNE groups are required to file a GloBE Information Return. This is a standardised report covering the group’s ETR calculations, GloBE income, and covered taxes across all jurisdictions.
Which MNE Groups Are in Scope for Pillar Two Singapore?
An MNE group falls within the scope of the MMT Act if it meets both of the following conditions:
- Revenue threshold: The group has consolidated annual revenue of €750 million or more in at least two of the four financial years immediately preceding the current financial year.
- Singapore presence: The group has at least one Constituent Entity, joint venture, or reverse hybrid entity that is incorporated, registered, or located in Singapore.
A Constituent Entity includes companies, partnerships, trusts, or other entities that are included in the consolidated financial statements of the MNE group — or that would be included but for their size or materiality.
MNE groups that are below the €750 million revenue threshold are not subject to MTT or DTT under the current rules, though the GloBE framework is expected to apply to more groups over time as implementation expands globally.
Exclusions
Certain entities are excluded from the GloBE rules, including government entities, international organisations, non-profit organisations, pension funds, and investment funds that are Ultimate Parent Entities of their group. Specific exclusions also apply to certain shipping income and certain real estate investment structures.
Registration Deadlines: What You Need to Do Now
Registration is a mandatory one-time requirement for all in-scope MNE groups. It covers the MTT, DTT, and the GloBE Information Return.
| Financial Year End | First FY Covered by MMT Act | Registration Deadline |
|---|---|---|
| 31 December | FY 2025 (1 Jan – 31 Dec 2025) | 30 June 2026 |
| 31 March | FY 2025/26 (1 Apr 2025 – 31 Mar 2026) | 30 September 2026 |
| 30 June | FY 2025/26 (1 Jul 2025 – 30 Jun 2026) | 31 December 2026 |
| 30 September | FY 2025/26 (1 Oct 2025 – 30 Sep 2026) | 31 March 2027 |
The registration deadline is within six months after the end of the first financial year to which the MMT Act applies.
Important: A 10% surcharge on any top-up tax payable may be imposed for failure to register on time. Groups should treat the registration deadline as a hard compliance deadline, not a discretionary target.
How to Register with IRAS for Pillar Two Top-Up Taxes
IRAS opened its online registration portal for MTT, DTT, and GIR in May 2026. Registration is completed electronically through IRAS’s tax portal.
Who registers?
The Ultimate Parent Entity (UPE) of the MNE group is responsible for registration. However, the UPE may appoint a Singapore Constituent Entity or a local tax agent to complete the registration on its behalf. A letter of authorisation is required when a Singapore entity or agent acts on behalf of a foreign UPE.
What information is required?
- MNE group name and UPE details
- Details of all Singapore Constituent Entities within the group
- The financial year end of the group
- The first financial year to which the MMT Act applies
- Whether the group is subject to MTT, DTT, or both
- Details of any agreed Filing Constituent Entity (FCE) responsible for the GIR
Local filing agent appointment
Groups headquartered outside Singapore whose UPE does not have direct access to the IRAS portal may appoint a Singapore-registered tax agent to complete registration and manage ongoing compliance obligations.
Understanding the Effective Tax Rate (ETR) Calculation
The GloBE ETR is calculated on a jurisdictional basis, not on a per-entity or per-transaction basis. It compares the GloBE Income or Loss of all Constituent Entities in a jurisdiction against the Covered Taxes paid by those entities.
GloBE Income differs from taxable income under domestic tax rules. It starts from the entity’s financial accounting profit or loss and applies specific GloBE adjustments, such as excluding certain dividend income, adding back deferred tax, and adjusting for certain tax credits.
Covered Taxes include current taxes on income accrued or paid in the financial year, as well as certain deferred taxes. Not all taxes qualify as Covered Taxes — for example, indirect taxes, employment taxes, and customs duties are generally excluded.
The Substance-Based Income Exclusion (SBIE)
The GloBE rules include an important carve-out known as the Substance-Based Income Exclusion (SBIE). This allows MNE groups to exclude a portion of income from the top-up tax calculation based on the value of tangible assets and payroll in each jurisdiction.
For groups with genuine operational substance in Singapore — employees, equipment, leased premises — the SBIE may significantly reduce or eliminate any Singapore-based top-up tax. This is relevant to groups considering where to locate operations and substance.
How Singapore's Existing Tax Incentives Are Affected
Pillar Two does not eliminate Singapore’s existing tax incentive framework. However, MNE groups that benefit from reduced corporate tax rates under Approved Trader schemes, Development Expansion Incentives, Global Trader Programme, or Fund Tax Exemptions may find that their effective tax rate in Singapore falls below 15%.
Where the ETR drops below 15%, the DTT will apply to top up the rate to 15% for Singapore-sourced income. In practice, this means the group’s total effective tax cost may not change — but the mix of taxes paid shifts from incentive-reduced corporate income tax to DTT.
Groups should model the post-Pillar Two effective rate for Singapore operations, taking into account the SBIE, applicable incentives, and covered tax positions.
Key Preparation Steps for In-Scope MNE Groups
Groups that have not yet begun Pillar Two preparation should act immediately, particularly those with a 31 December financial year-end facing the 30 June 2026 registration deadline.
Step 1: Confirm scope
Verify whether your MNE group exceeds the €750 million consolidated revenue threshold in at least two of the four preceding financial years. Confirm which Constituent Entities are present in Singapore.
Step 2: Appoint a Filing Constituent Entity
Designate a Filing Constituent Entity (FCE) responsible for submitting the GloBE Information Return on behalf of the group. The FCE should have access to the group’s consolidated financial data and GloBE calculations.
Step 3: Calculate preliminary ETRs
Prepare a preliminary jurisdictional ETR model using GloBE rules. Identify jurisdictions where the ETR may fall below 15% and quantify any potential top-up tax exposure.
Step 4: Assess data readiness
The GIR requires granular financial data at the Constituent Entity level. Groups that do not currently collect data in the format required by the GloBE rules will need to enhance their management reporting systems.
Step 5: Register with IRAS by the deadline
Complete the online registration through the IRAS tax portal, or appoint a local tax agent to do so on your behalf. Ensure the registration is completed before the applicable deadline for your financial year-end.
Frequently Asked Questions
Q1: Does Pillar Two apply to Singapore companies that are not part of a large MNE group?
No. Pillar Two only applies to MNE groups with consolidated annual revenue of €750 million or more in at least two of the four preceding financial years. Singapore companies that are standalone entities, part of smaller groups, or part of purely domestic groups are not in scope under the current rules.
Q2: My MNE group is headquartered outside Singapore. Does Pillar Two still apply?
Yes, if your group has at least one Constituent Entity incorporated, registered, or located in Singapore, and the group meets the €750 million revenue threshold. The Singapore entity may be subject to the Domestic Top-up Tax (DTT) if its effective tax rate in Singapore falls below 15%.
Q3: What happens if my group misses the registration deadline?
IRAS may impose a 10% surcharge on any top-up tax payable for failure to register on time. Registration should be treated as a mandatory compliance obligation, not a discretionary step. Groups unsure of their deadline should confirm based on their financial year-end date.
Q4: Can Singapore's corporate income tax incentives still be used after Pillar Two?
Yes. Singapore’s tax incentives remain available. However, where an incentive reduces the effective tax rate below 15%, the Domestic Top-up Tax will apply to bring the Singapore ETR to the minimum. The overall tax cost may not increase significantly if the SBIE carve-out for payroll and tangible assets applies.
Q5: What is the GloBE Information Return and when is it due?
The GloBE Information Return (GIR) is a detailed report covering the group’s GloBE income, covered taxes, and effective tax rates across all jurisdictions. It must be filed for each financial year the MMT Act applies. The first GIR for groups with a 31 December 2025 year-end will cover FY 2025. IRAS will confirm filing deadlines separately from registration.
Conclusion
Singapore’s implementation of Pillar Two through the Multinational Enterprise Top-up Tax and Domestic Top-up Tax represents a significant shift in the tax obligations of large MNE groups operating in or through Singapore.
For groups with consolidated revenue above €750 million and a Singapore presence, the rules are now active. The registration deadline for MNE groups with a 31 December 2025 financial year-end is 30 June 2026 — and failure to register carries a 10% surcharge on any top-up tax payable.
The interaction between Pillar Two, existing Singapore tax incentives, the SBIE carve-out, and the GloBE Information Return requirements makes this one of the most complex compliance developments in recent years.
If your group needs support with Pillar Two scope assessment, IRAS registration, ETR modelling, or GIR preparation, contact TY TEOH International to speak with our Singapore tax advisory team.