Scope of Module4 PartC
IRAS’s second-edition June2026 slides explain allocating jurisdictional top-up amounts to constituent entities(CEs), the de minimis election and Domestic Top-Up Tax(DTT) payment responsibilities. They continue the wider module’s ETR, excess-profit and substance-based income exclusion(SBIE) calculations. Multinational Enterprise Top-Up Tax(MTT) addresses a Singapore parent’s relevant foreign/stateless interests; DTT addresses Singapore entities and certain Singapore-established reverse hybrids.
Start with the jurisdictional amount
Jurisdictional top-up equals excess profits×top-up percentage, plus additional current top-up, less qualified domestic minimum top-up tax(QDMTT). First compute the jurisdiction’s ETR and top-up, then determine eachCE’s share. Different allocation rules apply where the sum of CE GloBE income/loss is positive versus zero or negative. Do not use a loss entity’s negative amount as a negative allocated tax.
Positive jurisdiction income: allocate only to positiveCEs
Under section16(2), CE top-up=A×B/C. A is the jurisdictional top-up; B is thatCE’s GloBE income if positive, otherwise zero; C sums only positive CE income, not jurisdiction net income. Example1 has income50,150,−75 and jurisdiction top-up10. The allocation denominator is200, not125, giving2.5,7.5,0.
Non-positive jurisdiction with section21(1) only
Under section16(3)(a), allocate A×D/E. D is zero if theCE’s income is positive or its adjusted covered taxes are non-negative. Otherwise D=GloBE income×15%−adjusted covered taxes; E sums theseD values. Example2 has income50,−160,−80 and covered taxes2,−40,−20. D is0,16,8 andE24; jurisdiction top-up30 allocates0,20,10. This rule follows the particular negative-tax trigger, not positive-income proportions.
Recalculation of one previous financial year
Where current jurisdiction income is non-positive and the only additional top-up is section21(4) recalculation for one earlierFY, section16(3)(b) usesA×F/G. F is theCE’s earlier-year GloBE income, with negative values treated as zero; G sumsF. Example3 recalculatesFY1 inFY5: previous incomes20,80,−50 give denominator100 and allocation2,8,0 from top-up10. Use the recalculated year’s income, not the current loss-year’s income.
Several previous years: allocateQDMTT before entity shares
For section21(4) only across several priorFYs, take each year’sP1 out of totalP and deduct its share ofQDMTTK: A=P1−K×P1/P. Allocate each resultingA using that prior year’sF/G, then sum entity allocations. Example4 hasFY1P1=10,FY2P2=20,total30 andQDMTT24, leaving jurisdiction6: year shares2and4. FY1 incomes20,80,−50 allocate0.4,1.6,0; FY2 incomes80,80,−50 allocate2,2,0. Totals are2.4,3.6,0.
Both additional-top-up sources in a non-positive jurisdiction
For a combination of section21(1) amountC and recalculation totalP, proportionately distributeQDMTTK across both. The current-trigger shareA1=C−K×C/(C+P), allocated byD/E. Each prior-year shareA2=P1−K×P1/(C+P), allocated by that year’sF/G. Sum all components for eachCE. The variableC here denotes the current additional amount, not the positive-income denominator used in the earlier formula.
Example5: all three components reconciled
FY5 has section21(1)30 and two recalculations10each, total50;QDMTT40 leaves10. Current share6 uses incomes50,−160,−80 and taxes2,−40,−20, yieldingD0,16,8 and allocations0,4,2. FY1 share2 uses incomes20,80,−50 and allocates0.4,1.6,0. FY2 share2 uses80,80,−50 and allocates1,1,0. Entity totals are1.4,6.6,2, reconciling to jurisdiction10. The source’s last-row labelsA1+A2+A3 refer to allocated components, not simply adding jurisdiction shares independently for everyCE.
| Case | Income/tax inputs CE1/2/3 | Allocated pool | Entity results CE1/2/3 |
|---|---|---|---|
| Example1: positive | 50 /150 /−75 | 10 | 2.5 /7.5 /0 |
| Example2:21(1) | 50 /−160 /−80;tax2 /−40 /−20 | 30 | 0 /20 /10 |
| Example3: one priorFY | 20 /80 /−50 | 10 | 2 /8 /0 |
| Example4:FY1component | 20 /80 /−50 | 2 | 0.4 /1.6 /0 |
| Example4:FY2component | 80 /80 /−50 | 4 | 2 /2 /0 |
| Example4:total | Recalculations30 lessQDMTT24 | 6 | 2.4 /3.6 /0 |
| Example5:current | 50 /−160 /−80;tax2 /−40 /−20 | 6 | 0 /4 /2 |
| Example5:FY1 | 20 /80 /−50 | 2 | 0.4 /1.6 /0 |
| Example5:FY2 | 80 /80 /−50 | 2 | 1 /1 /0 |
| Example5:total | Additional50 lessQDMTT40 | 10 | 1.4 /6.6 /2 |
An allocatedCE amount is not yet the parent’sMTT bill
After computing eachCE’s top-up, a Singapore-located parent that is a responsible group member during theFY, holds an interest in anotherCE and has a relevant foreign/statelessCE with a top-up amount determinesMTT. Its charge depends on its inclusion ratio in each relevant entity. The module refers ownership/inclusion details to Module1 PartB; full jurisdictional orCE tax is not automatically all payable by every parent.
De minimis is an annual jurisdiction-wide election
The filing entity elects in theGIR each year; qualifyingCE top-up is deemed zero. It generally applies across a jurisdiction to the ordinaryCE grouping rather than qualifying everyCE separately. Special entities, minority-ownedCEs(MOCEs) and minority-owned subgroup members do not join that ordinary grouping. Standalone joint ventures and joint-venture groups can qualify in their respective groupings. Stateless entities, investment entities(IEs) and insurance investment entities(IIEs) are expressly excluded from the nil treatment described in section19.
Two strict three-year average thresholds
Both tests must pass: average adjusted revenue belowEUR10million and averageGloBE income/loss belowEUR1million. Use currentFY, previousFY and the year before it, based on the entities in the jurisdiction for each respective year. Equality does not pass the detailed less-than tests even though the introductory slide loosely says do not exceed. If none of the group’sCEs in a prior year has any adjusted revenue orGloBE income/loss, disregard thatFY from the averages; do not automatically divide every new jurisdiction by three.
Adjusted revenue and short financial years
Adjusted revenue starts with revenue reflected in financial-accounting net income/loss(FANIL), adding the prescribed changes toFANIL that affect revenue when derivingGloBE income/loss. Exclude expense-only increases/decreases and later-year recalculation reductions to that year’s revenue or income undersection21(4). UnderRegulation95 these are not interchangeable with total accounting-revenue changes. For anFY not12months, annualise jurisdiction revenueA and income/lossB asA×365/days andB×365/days before applying the averages.
DTT uses Singapore groupings without aQDMTT reduction
Module4 rules also apply toDTT, computing jurisdictionalETR and top-up across Singapore entities subject to separate groupings. UnlikeMTT’s foreign/stateless interests, DTT targets Singapore entities; theDTT formula does not subtractQDMTT. DTT sums ordinary SingaporeCE amounts, Singapore-established reverse-hybrid entities(RHEs) not located in Singapore, SingaporeJV/JV subsidiaries, and Singapore minority-owned subgroup/MOCE amounts. IE andIIE top-up is zero forDTT; their wider treatment belongs to Module8.
DFE designation, return and payment
The ultimate parent(UPE) designates a SingaporeCE as designated filing entity(DFE) for SingaporeCEs, connected SingaporeJV/subsidiaries and Singapore-establishedRHEs located elsewhere. A securitisation entity cannot be chosen unless it is the only SingaporeCE. TheDFE files theDTT return, computes and paysDTT on behalf of the covered entities. That central duty is distinct from the section45 payment election.
Section45(1) lets an eligible entity pay its own allocated part
A group may elect for a particularCE,JV orJV subsidiaryX to pay attributableDTTY. Do not elect for an entity with negativeGloBE income/loss, a flow-through entity that is not anRHE for any of its income/expenditure/profit/loss, anETR of15%or more, or an entity no longer in/connected to the group before theFY return date. Zero income is not listed as negative in that restriction, but the guide does not provide a zero-denominator computation; do not invent one.
Three allocation bases for an entity’s elected payment
For an ordinaryCE, Y=(A/B)×C: A isX’s income, B is positive income summed for ordinary SingaporeCEs, C their total top-up. For a Singapore-establishedRHE located elsewhere, a standaloneMOCE or standaloneJV, B isX’s own income andC its own top-up. For a minority-owned subgroup member orJV-group entity, B sums positive income of that Singapore subgroup/JV grouping andC sums its top-up. Use the corresponding grouping, not the entireMNE’s worldwide income.
TheDTT election changes payer, not total tax
The four-entity example has income100,200,−80,80,total300; adjusted taxes10,15,0,11,total36. ETR12%, top-up percentage3% andSBIE30 give excess profits270 andDTT8.1. ElectingCE2 to pay uses positive income100+200+80=380, soCE2 pays200/380×8.1=4.26 rounded,DFE pays3.84 and total remains8.1. This is an allocation of payment responsibility, not an extra exclusion or reduction in group tax.
Official source
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