The October 2025 workshop framework
This article follows Part 1 of IRAS’s global minimum tax workshop on 2 October 2025. Singapore’s multinational enterprise top-up tax (MTT) implements the income inclusion rule, while domestic top-up tax (DTT) implements the qualified domestic minimum top-up tax. They apply to the relevant MNE groups for financial years beginning on or after 1 January 2025. The minimum rate is 15%; the undertaxed profits rule is presented as an international backstop, not as another Singapore charge in these slides.
From scope to the top-up amount
The five-step process tests group revenue and scope, identifies constituent entities and their locations, considers safe harbours and de minimis rules, computes GloBE income and adjusted covered taxes, then calculates the jurisdictional effective tax rate and top-up amount. ETR equals adjusted covered taxes divided by GloBE income. Excess profit is GloBE income less the substance-based income exclusion (SBIE). Apply the difference below 15%, add any additional current top-up amount and subtract the applicable QDMTT. Allocate a jurisdictional amount to entities with positive GloBE income.
Entity classification follows consolidation
Determine the ultimate parent and group boundary before classifying entities. Constituent-entity status follows accounting consolidation and control, rather than a single shareholding percentage. The diagram distinguishes ordinary constituent entities, partially owned parent entities, minority-owned entities or subgroups, equity-accounted joint ventures and associates. Excluded entities are outside MTT and DTT under their qualifying conditions. Consolidated entities and qualifying JVs require the relevant treatment; an equity-accounted associate is not simply treated as an ordinary consolidated subsidiary.
Rule order and implementation dates
Identify which locations have IIR, QDMTT and any UTPR in force for the year concerned. The 2024 diagrams show foreign parents collecting IIR on Singapore income before Singapore’s implementation. In 2025 Singapore DTT collects the relevant domestic top-up, while Singapore MTT can apply to low-taxed foreign subsidiaries when the applicable parent chain requires it. A foreign QDMTT collects its domestic amount first, and a qualified foreign UPE’s IIR can displace a Singapore intermediate parent’s ordinary IIR role. Singapore entities still trigger registration even if the final tax is nil.
Split ownership and the partially owned parent
A POPE holds an interest in another group constituent entity and has more than 20% of its profit ownership held directly or indirectly by non-group persons, excluding the specified UPE, PE and investment categories. The example with a 70%-owned intermediate parent shows why that parent applies IIR despite a qualified IIR at the ultimate-parent level. The split-ownership rule must be considered separately from ordinary top-down priority and accompanied by the relevant offset mechanism.
The transitional CbCR safe harbour
The workshop’s transitional safe harbour applies to financial years beginning on or before 31 December 2026, excluding years ending after 30 June 2028. Passing any one test deems the relevant top-up zero: revenue below EUR 10 million and pretax profit below EUR 1 million; simplified ETR at least 16% for a year beginning in 2025 or 17% in 2026; or pretax profit no greater than SBIE. Qualified CbCR and financial statements are required for the respective tests. The once-out-always-out rule limits later re-entry. These are the dates stated in this October 2025 workshop.
The financial-accounting starting point
A non-PE entity normally starts with the net income used in preparing the ultimate parent’s consolidated financial statements, before elimination of intragroup transactions. If that is not reasonably practicable, qualifying reliable local financial statements using an acceptable or authorised standard can be used under the stated conditions, including adjustment of permanent differences above EUR 1 million between standards. This alternative is not simply an unrestricted choice of whichever accounting result gives a better tax outcome.
Local accounting standards for Singapore DTT
The local-standard rule requires the Singapore constituent entities to have the same financial year-end as the UPE and to prepare the specified Singapore-standard statements either under written law or with external audit. The accepted standards are SFRS(I), SFRS and SFRS for Small Entities. It applies separately to standalone JVs and JV groups with the required UPE year-end. If the conditions fail, use the ordinary UPE-accounting approach. The polling exercise confirms that a different year-end does not qualify merely through incorporation or alignment of results into the parent’s consolidation period.
Mandatory adjustments and elections
Adjustments include taxes, acquisitions, excluded dividends and equity results, revaluation, asymmetric foreign exchange, illegal payments and fines, accounting changes, pensions, arm’s-length requirements, insurers, intragroup financing, additional-tier-one capital, shipping, PE and flow-through allocation, transfers and qualifying refundable or transferable credits. Elections address dividends and equity results, financial distress, realisation, stock compensation, five-year gains, intragroup transactions, foreign-exchange hedges and tax fair-value adjustments. Each requires its own legal conditions; accounting net income is not itself the final GloBE amount.
Excluded dividends and instruments
Dividends on direct ownership interests are generally excluded unless they are short-term portfolio dividends or the specified elected investment-entity interests. A payment treated as an expense by the distributing CE, a debt-interest payment or additional-tier-one-capital payment does not receive the ordinary dividend exclusion. Issuer classification matters for a hybrid instrument such as redeemable preference shares. For a compound instrument, distinguish its equity and debt portions rather than treating the whole return as a dividend.
The 10% and one-year tests
A short-term portfolio interest combines group-held rights below 10% with an uninterrupted holding period below one year at distribution. Aggregate the group’s interests: two group entities holding 5% each reach 10%. Use last-in-first-out treatment for disposals when tracing holding periods. In the example, 200 older shares plus 100 newer shares less a disposal of 40 newer shares leave 260; a S$26 dividend is split into S$20 excluded on the older shares and S$6 included on the 60 short-term shares.
Different economic rights and the dividend election
Aggregate interests carrying the same rights and give equal regard to distinct relevant profit, capital or reserve classes where percentages differ. The example weights profit and capital equally: 50% profit plus 80% capital gives 65%; 50% profit alone gives 25%; 20% capital alone gives 10%. A CE can elect to include all portfolio dividends for simplification. The election is locked for the current and following four years; after revocation a fresh election is barred for that year and the following four years, including elections in another jurisdiction for the same CE.
Excluded equity gains and losses
The exclusion covers relevant non-portfolio fair-value changes, equity-method results and disposal gains or losses. Fair-value portfolio status is tested at year-end and disposal portfolio status immediately before sale. Exclude an applicable gain and add back an applicable loss. The polling answers identify subsidiary, associate and JV impairment, equity-method results and relevant disposal results as excluded; portfolio fair-value movements and investment-property gains are not treated as excluded equity results. An OCI amount is not automatically a profit-and-loss item to remove.
The equity-result election
The filing entity can elect in the GIR for the qualifying excluded equity results of all group CEs in a jurisdiction to be included. The slides identify taxable mark-to-market, impairment, realisation, equity-method and disposal cases, but preserve the exception for qualified ownership interests under Regulation 42(5). The five-year lock and five-year re-election restriction apply. Revocation is also prohibited where an otherwise excluded loss on an ownership interest was taken into account during the election.
Why some adjustments concern MTT rather than DTT
The slides distinguish acquisition adjustments where DTT uses local standards, asymmetric foreign exchange where Singapore tax currency aligns with accounting currency, intragroup exclusion elections where Singapore has no tax-consolidation concept, and transfers of controlling interests where Singapore does not deem a share sale an asset sale. These differences arise from domestic accounting and tax treatment, not an assertion that every regulation is universally irrelevant to DTT in any circumstance.
Asset transfers and GloBE reorganisations
An ordinary asset or liability transfer includes the transferor’s gain or loss and gives the transferee the accounting basis. A GloBE reorganisation requires significant equity consideration, untaxed transfer gain and carryover tax basis; it excludes the gain except any non-qualifying amount and carries the transferor’s value forward for the transferee’s later disposal. For Singapore domestic transfers, a section 24 election or qualifying section 34C amalgamation may satisfy the untaxed-gain and carryover-basis conditions, but the complete definition must still be tested.
Covered taxes and unrecognised loss assets
Start with current and deferred tax expenses reflected in FANIL that concern covered taxes, then make the statutory adjustments. Deferred tax arises from accounting and tax timing differences. Regulation 45(1)(c) disregards DTA valuation and recognition adjustments; Regulation 45(1)(g) recognises the stated deemed loss DTA where accounting recognition criteria were not met. In each illustrated 15% case, a loss of 100 gives an initial adjusted tax amount of minus 15; later accounting recognition of 15 is reversed for GloBE, leaving zero for that later recognition.
Post-filing adjustments by year and jurisdiction
An increase in prior-year covered taxes is generally taken in the current year. A material decrease recalculates the earlier year’s ETR and top-up, with incremental tax becoming additional current top-up. A decrease below EUR 1 million can use the current-year election. Aggregate adjustments across all in-scope entities in the jurisdiction for each previous year first. The example produces a net decrease of 0.5 million, a net increase of 3 million and a net decrease of 4 million in different years; the small decrease can be elected into the current year, the increase goes there and the material decrease requires the earlier-year recalculation.
Foreign credits and the DTT allocation boundary
Deferred tax from generating or using ordinary tax credits is excluded. A qualifying foreign-tax-credit adjustment is restricted to the defined CFC-income and domestic-loss mechanism and to the lower of the credit and the qualifying domestic loss multiplied by the domestic rate. The workshop explains why Singapore’s lack of foreign-credit carryforward makes those adjustments generally MTT issues. For DTT, do not import foreign owner tax on Singapore PE income, distributions, hybrids or CFCs into the Singapore entity; conversely remove Singapore-owner tax allocated to the relevant foreign PE or hybrid.
Official source
This article independently explains the substantive contents of the official PDF, including the relevant conditions, procedures and annexes. The linked document remains the authoritative source for its original wording, and later changes should be checked separately.
Read the official PDF ↗