BEPS Pillar Two and 15% Multinational Top-up Tax is the collective term for Singapore’s implementation of the OECD/G20 global minimum tax framework through the Multinational Enterprise (Minimum Tax) Act 2024, which ensures large multinational groups operating in Singapore pay an effective tax rate of at least 15% on profits earned here, from financial years beginning on or after 1 January 2025.
Raffles Corporate Services works with a panel of corporate and employment law firms; this article is general information, not legal advice.
What is BEPS Pillar Two and 15% Multinational Top-up Tax, and how has Singapore implemented it?
BEPS Pillar Two is the second pillar of the OECD/G20 Base Erosion and Profit Shifting project, designed to ensure large multinational enterprise (MNE) groups pay a minimum effective tax rate wherever they operate, reducing the incentive to shift profits into low-tax jurisdictions. Singapore implemented Pillar Two domestically through the Multinational Enterprise (Minimum Tax) Act 2024, which Parliament passed on 15 October 2024 and which received presidential assent on 8 November 2024. The full text of the Act is available on Singapore Statutes Online.
The Act introduces two connected mechanisms into Singapore law: the Income Inclusion Rule (IIR), drawn from the OECD’s Global Anti-Base Erosion (GloBE) Model Rules, and a Domestic Top-up Tax (DTT). Both apply to financial years beginning on or after 1 January 2025, meaning the first affected financial years are already underway for most in-scope groups with a calendar year end.
Who is in scope of Singapore’s Multinational Enterprise (Minimum Tax) Act 2024?
The rules target large MNE groups, broadly defined as groups with annual global revenue of at least EUR 750 million, consistent with the threshold used across the OECD’s Pillar Two framework internationally. A Singapore-incorporated entity that is part of such a group, even if the ultimate parent is headquartered overseas, can fall within scope if the group’s consolidated revenue meets the threshold and the Singapore entity’s profits are taxed below the 15% minimum rate. Purely domestic Singapore groups without the qualifying international revenue scale sit outside the regime entirely, so the rules are not a general corporate tax change affecting the typical Singapore SME; they are targeted squarely at the largest multinational groups with a Singapore footprint.
Entities within scope should also note that their ACRA annual filing obligations continue entirely unchanged and sit alongside, not instead of, any new Pillar Two registration and reporting duties that flow from the Multinational Enterprise (Minimum Tax) Act 2024.
Determining scope is not always a one-line exercise. Groups sitting close to the EUR 750 million threshold should track it over a multi-year testing period rather than a single financial year, since the standard GloBE approach looks at whether the threshold was met in at least a set number of the preceding financial years, meaning a group that dips below the threshold in one year may still remain in scope based on its recent history. Newly formed groups, groups that have recently merged or demerged, and groups with a Singapore entity that only recently joined an international structure should treat the scope question as one requiring a proper technical assessment rather than a quick estimate, given how consequential getting the scope determination wrong can be for subsequent compliance obligations.
How do the Income Inclusion Rule and Domestic Top-up Tax work together?
The two mechanisms are designed to interact so that Singapore, rather than another jurisdiction, collects any top-up tax attributable to under-taxed profits earned here. The Domestic Top-up Tax applies directly to the low-taxed profits of in-scope group entities located in Singapore, effectively topping up their Singapore effective tax rate to 15% before any other country’s rules can claim that revenue. The Income Inclusion Rule, by contrast, operates at the level of a parent entity, potentially in Singapore or elsewhere in the group structure, requiring that parent to pay top-up tax on the low-taxed profits of its subsidiaries wherever those subsidiaries are located, if those subsidiaries are not already subject to an equivalent top-up mechanism locally.
In practice, the Domestic Top-up Tax is the mechanism most directly relevant to a Singapore-incorporated subsidiary or holding entity: if that entity’s Singapore effective tax rate would otherwise fall below 15%, perhaps because it enjoys a concessionary incentive rate, the DTT collects the shortfall in Singapore rather than ceding that tax revenue to a foreign parent jurisdiction’s IIR. This is a significant structural point for group tax and finance teams to understand, because it changes the ordering logic of a MNE’s minimum tax calculation and affects where compliance obligations, and the associated administrative burden, actually sit within the group. Our companion guide on Domestic Top-up Tax and Pillar Two registration for a company secretary in Singapore covers the registration and filing mechanics in more depth and is a natural next step once a group has confirmed it is in scope.
A related mechanism in the wider OECD framework, the Undertaxed Profits Rule (UTPR), acts as a backstop where neither a Domestic Top-up Tax nor an Income Inclusion Rule elsewhere in the group has picked up the full top-up amount. Singapore’s own domestic rules are principally built around the IIR and DTT rather than a Singapore-administered UTPR, but groups with entities spread across multiple jurisdictions should understand that a shortfall not collected through Singapore’s DTT or IIR may still be picked up by another jurisdiction’s UTPR, which is one further reason a group-wide view of Pillar Two exposure, rather than a Singapore-only view, is the only reliable way to plan.
When do these rules take effect, and what is the compliance timeline?
The IIR and DTT apply for financial years beginning on or after 1 January 2025. For a Singapore entity with a calendar year financial year, this means FY2025 is the first affected year, with the associated compliance and filing obligations following in the periods after that financial year closes, consistent with how corporate tax compliance generally trails the financial year it relates to. Groups should not wait until a filing deadline approaches to assess exposure; because the underlying GloBE calculations require detailed jurisdiction-by-jurisdiction effective tax rate computations across the whole group, the practical work of gathering data, mapping entities, and identifying where top-up tax liabilities sit typically needs to start well before the financial year closes, not after.
Key figures worth keeping close at hand for any group assessing exposure:
- Global revenue threshold for scope: at least EUR 750 million in annual consolidated group revenue.
- Minimum effective tax rate targeted: 15%, against Singapore’s standard headline Corporate Income Tax rate of 17%.
- Multinational Enterprise (Minimum Tax) Act 2024 passed by Parliament: 15 October 2024.
- Presidential assent to the Act: 8 November 2024.
- First affected financial years: those beginning on or after 1 January 2025.
The Finance (Income Taxes) Act 2025 subsequently amended the Multinational Enterprise (Minimum Tax) Act 2024 to incorporate updates to the Pillar Two rules issued by the OECD and to reflect measures announced in the 2025 Budget. This is a useful reminder that Pillar Two implementation in Singapore is not a static, one-off piece of legislation; groups should expect further refining amendments as the OECD’s own guidance evolves and as Singapore aligns its domestic rules accordingly.
How does the 15% minimum rate interact with Singapore’s 17% headline tax rate?
Singapore’s standard headline corporate tax rate, set under the Income Tax Act 1947, is 17%, which sits comfortably above the 15% Pillar Two minimum on its face. The practical relevance of the Multinational Top-up Tax to Singapore-based entities therefore arises mainly where a company’s effective tax rate, after incentives, exemptions or concessionary rates, falls below 15% despite the 17% headline rate, for instance where an entity benefits from a concessionary tax incentive that brings its effective rate down.
In those situations, the Domestic Top-up Tax closes the gap between the entity’s actual effective rate and the 15% floor. Groups that have historically relied on Singapore’s incentive regime to achieve an effective rate below 15% should treat Pillar Two as a reason to revisit that structuring, since the tax saved under an incentive can, for an in-scope MNE group, simply be collected back as top-up tax rather than genuinely reducing the group’s overall tax bill. Singapore’s standing as a financial and business hub, an emphasis reflected in the Monetary Authority of Singapore’s ongoing work on the city-state’s tax and regulatory competitiveness, means groups need to plan Pillar Two exposure carefully rather than treat Singapore incentives as a simple discount that survives regardless of the group’s global position.
What did the Finance (Income Taxes) Act 2025 change?
The Finance (Income Taxes) Act 2025 amended the Multinational Enterprise (Minimum Tax) Act 2024 to fold in Pillar Two rule updates issued at OECD level after the original Act was passed, alongside measures flowing from the 2025 Singapore Budget. For groups that built their initial Pillar Two compliance models against the original 2024 Act, this amendment is a prompt to check that those models still reflect the current rules rather than the position as it stood at initial passage. Given how technical and fast-moving GloBE implementation guidance has been internationally, periodic revalidation of a group’s Pillar Two model against the latest Singapore legislative text, rather than a one-time build, is now a standard part of good practice for in-scope finance teams. In-scope entities generally carry a registration and notification obligation distinct from their ordinary corporate tax filing, so a group confirming it is in scope should treat Pillar Two registration as an additional compliance step rather than something automatically captured by existing corporate tax or ACRA filings, and should assign clear internal ownership for that registration well before the relevant filing window opens.
What mistakes do groups make when assessing Pillar Two exposure?
The most common mistake is assuming that because a Singapore entity pays tax at the 17% headline rate, it cannot possibly be affected by a 15% minimum tax. This overlooks the fact that GloBE effective tax rate calculations are not the same as the entity’s ordinary Singapore tax computation; they involve their own adjustments, deferred tax treatment and jurisdictional blending rules that can produce a materially different effective rate. A second mistake is treating Pillar Two as purely a tax department issue, when in practice it requires data from finance, group reporting and sometimes HR, given that headcount and substance-based carve-outs can affect the calculation.
A third mistake, and one we see surprisingly often, is confusing Singapore’s Pillar Two rules with unrelated corporate structuring questions, such as assuming particular trust or fund vehicles can be used to sidestep the rules; groups exploring aggressive restructuring in response to Pillar Two should treat any such proposal with real scepticism and verify it against the actual legislation rather than informal market commentary. For a closer look at where in-scope groups most often go wrong in practice, including documentation and registration pitfalls that can lead to a filing being rejected or queried, see our sibling guide on BEPS Pillar Two and 15% Multinational Top-up Tax: common mistakes and rejections, which complements this FAQ with a more granular, error-focused treatment of the same topic.
Groups restructuring their Singapore workforce alongside a Pillar Two review, for example where finance or tax specialists relocate to Singapore as part of centralising group tax functions, should also note that longer-term mobility questions, such as re-entry permit renewals and permanent residence maintenance costs, run on entirely separate timelines and fee structures from the tax compliance work, and should be planned independently rather than bundled into the same project timeline.
FAQs
Does the 15% Multinational Top-up Tax apply to Singapore SMEs?
No. It applies only to entities within large MNE groups with annual global revenue of at least EUR 750 million. A standalone Singapore SME without that scale of group revenue is outside the scope of the Multinational Enterprise (Minimum Tax) Act 2024 entirely.
If my Singapore entity pays tax at 17%, can it still owe top-up tax?
It is unlikely but not automatically impossible, because the GloBE effective tax rate calculation used for Pillar Two purposes differs from Singapore’s ordinary tax computation. Entities benefiting from incentives or concessions that reduce their effective rate below 15% are the ones most likely to be affected.
From when do the IIR and DTT apply?
Both apply to financial years beginning on or after 1 January 2025, so a Singapore entity with a calendar year financial year is already within the first affected financial year.
What is the difference between the Income Inclusion Rule and the Domestic Top-up Tax?
The Domestic Top-up Tax collects any shortfall below the 15% minimum directly in Singapore, at the level of the Singapore entity itself. The Income Inclusion Rule operates at the parent entity level and can require a parent, in Singapore or elsewhere, to pay top-up tax on low-taxed profits of subsidiaries anywhere in the group.
Has the original 2024 Act been amended since it was passed?
Yes. The Finance (Income Taxes) Act 2025 amended the Multinational Enterprise (Minimum Tax) Act 2024 to incorporate further OECD Pillar Two rule updates and measures from the 2025 Budget, so groups should check they are working from the current, amended version of the rules.
Need help with this? Call, SMS or WhatsApp +65 8501 7133, or email [email protected]. Raffles Corporate Services works with a panel of corporate and employment law firms; this article is general information, not legal advice.