New regulations introduce flexible currency conversion methods for calculating top-up tax amounts and provide clearer guidance on tax obligations for stateless entities, flow-through structures, and joint ventures operating within consolidated groups, with changes applying retrospectively to fiscal years beginning on or after 1 January 2024.
Australia has implemented amendments to its multinational taxation framework through the Taxation (Multinational—Global and Domestic Minimum Tax) Amendment (2026 Measures No.1) Rules 2026 on 26 March 2026. The changes took effect immediately upon registration and apply retrospectively to fiscal years starting on or after 1 January 2024.
New currency conversion flexibility
Multinational entities now have greater flexibility when converting foreign currency amounts to Australian dollars for top-up tax calculations. Companies can select from three exchange rate options on the final day of their fiscal year:
- The Reserve Bank of Australia’s daily exchange rate
- The relevant foreign central bank’s daily exchange rate
- Any publicly available commercial market exchange rate
This flexibility applies across Income Inclusion Rule (IIR) top-up tax, Domestic top-up tax, and Undertaxed Profits Rule (UTPR) top-up tax calculations.
Clearer treatment for stateless and flow-through entities
The amendments provide explicit guidance for stateless constituent entities and Australian-created flow-through entities that previously operated in regulatory grey areas. The rules now specify when domestic top-up tax obligations apply to these entities, with particular attention to joint ventures and their subsidiaries.
Consolidated groups and tax allocation
Joint venture subsidiaries within Australian consolidated groups now receive the same treatment as standard constituent entities, provided the head company is not an excluded or securitisation entity. The amendments also clarify how covered taxes should be allocated, particularly for taxes imposed under Australian jurisdiction laws and those affecting reverse hybrid entities or hybrid entities operating in Australia.
These administrative updates, authorised under the Taxation (Multinational—Global and Domestic Minimum Tax) Act 2024, align Australia’s tax system with international standards while addressing practical implementation challenges.
Earlier, on 20 March 2026, the Australian government gazetted the Taxation (Multinational—Global and Domestic Minimum Tax) (Qualified GloBE Taxes) Amendment (Measures No. 1) Determination 2026, updating the 2025 Determination to align with the OECD’s central record of jurisdictions that have qualifying global anti-base erosion (GloBE) taxes.
