Raffles Consulting Services
Track Singapore MTT, DTT and GloBE registration and first-filing dates, including the 18-month transition-year deadline.
An in-scope multinational group with a 31 December 2025 year end should already have registered for Singapore Pillar Two by 30 June 2026. Its first Singapore MTT return, DTT return and GloBE Information Return are generally due by 30 June 2027 if 2025 is the group’s transition year, because the transition-year filing period is 18 months rather than 15 months.
Other year ends need their own dates. The registration deadline is six months after the end of the group’s first financial year to which the Singapore rules apply. The return deadline is generally 15 months after year end, extended to 18 months for a transition year as defined under the legislation and guidance.
Check whether the group is in scope
Singapore’s Multinational Enterprise Top-up Tax and Domestic Top-up Tax apply for financial years beginning on or after 1 January 2025. The current IRAS registration page states that registration is required where the multinational group has annual revenue of at least 750 million euros in the ultimate parent entity’s consolidated financial statements for at least two of the four financial years before the tested year and has the required Singapore entity, joint venture or reverse-hybrid connection.
Do the revenue test at group level. A small Singapore subsidiary can still be within an in-scope group. Keep the consolidated statements, ownership chart, excluded-entity analysis and list of Singapore entities behind the conclusion.
Registration is a separate deadline
The registration is a one-time process and is due within six months after the first applicable financial year end. IRAS asks for group and entity information, the first applicable financial year, contact details and the Singapore entities appointed for local filing roles.
For DTT and the GloBE Information Return, the group identifies a designated local DTT filing entity and a designated local GloBE filing entity. For MTT, the responsible member is relevant. These appointments should be approved internally before the form is submitted because they determine Corppass access, data ownership and responsibility for later filings.
Map the three filing streams
| Filing | Main purpose | Singapore access route described by IRAS |
|---|---|---|
| MTT return | Singapore income inclusion rule liability of the responsible member | myTax Portal using the responsible member’s UEN |
| DTT return | Domestic top-up tax for low-taxed Singapore profits | myTax Portal using the Group ID |
| GloBE Information Return | Standardised group information and computations | myTax Portal using the Group ID, unless the permitted exchange route applies |
IRAS states that relevant personnel and tax agents can be authorised for the new services from January 2027. Access setup should be tested well before the first return deadline. A technically complete computation cannot be filed if the Group ID, Corppass roles or local appointments are unresolved.
Understand the transition-year date
The current IRAS MTT and DTT e-Tax Guide gives a 15-month filing period and an 18-month period where the financial year is a transition year. IRAS also notes that transition-year status is determined on a worldwide basis across jurisdictions where the group operates, not separately for Singapore alone.
For a calendar-year group first subject to the GloBE rules worldwide in 2025, 18 months after 31 December 2025 is 30 June 2027. If the group entered the rules earlier in another jurisdiction, the Singapore team should not assume that its first Singapore year receives the 18-month period. Confirm the worldwide transition-year position with the central tax team.
Build the data file before year end closes
Pillar Two calculations draw from consolidated financial accounting data and require adjustments, covered taxes, entity classifications, ownership, elections and jurisdictional computations. The IRAS overview also points taxpayers to current OECD materials, including the 2026 Side-by-Side package and later administrative guidance.
Create one entity register with legal name, tax identification number, jurisdiction, ownership, entity type, accounting standard, functional currency and source-system owner. Then map trial-balance accounts to the GloBE data requirements. Record every manual adjustment with its preparer, reviewer, source and rule reference.
A calendar-year example
Consider a group with 31 December year end, revenue above the threshold in 2021, 2022 and 2024, and two Singapore subsidiaries. The Singapore rules first apply to the year beginning 1 January 2025. Registration is due by 30 June 2026. If 2025 is the worldwide transition year, the first returns are due by 30 June 2027.
The group appoints one Singapore subsidiary as the designated local DTT and GloBE filing entity and identifies the responsible member for MTT. During 2026 it reconciles local ledgers to the consolidation system, confirms entity classifications and tests safe-harbour data. In January 2027 it checks portal access, leaving time for review rather than treating June as the start date.
Escalate a missed registration now
By August 2026, a calendar-year group that first came into scope for 2025 is already past the 30 June 2026 registration date. The local finance team should not wait for the return project to begin. Confirm the facts, identify the filing entities and responsible member, preserve the analysis and contact IRAS through the appropriate channel about the late registration position. The response should be coordinated with the group’s central Pillar Two owner so Singapore information matches the worldwide entity list and transition-year conclusion.
For groups with a later year end, put three internal dates ahead of the statutory deadline: scope confirmation, officer approval of the registration details and completion of access setup. A six-month statutory window can narrow quickly when ownership data or local appointments have not been agreed.
Keep ordinary Singapore tax work separate
Pillar Two returns do not replace corporate income tax returns, transfer pricing documentation or financial statements. The data should reconcile, but each filing has its own rules and due dates. A change in accounting, ownership or incentive status may affect several workstreams at once.
The Singapore transfer pricing guide covers the related-party file, while the foreign-sourced income guide addresses a separate exemption question. The Corporate and International Tax Consulting hub connects the wider tax position. The first Pillar Two filing will be manageable if the group fixes ownership of the data, portal access and review dates now.