What are the Global and Domestic Minimum Tax Rules?
Australia has implemented key parts of Pillar Two of the OECD/G20 Two-Pillar Solution—known as the Global and Domestic Minimum Tax. These rules require large multinational enterprise (MNE) groups (with global revenue ≥ EUR 750 million) to ensure their effective tax rate is at least 15% in every jurisdiction they operate, or face top-up tax liabilities. (ato.gov.au)
Key components include:
- Income Inclusion Rule (IIR): applies for fiscal years from 1 January 2024. Under the IIR, top-up tax may be applied to Australian resident multinational parent entities if income taxed overseas has an effective rate below 15%. (ato.gov.au)
- Undertaxed Profits Rule (UTPR): acts as a back-stop where no IIR applies; effective from fiscal years starting 1 January 2025. (ato.gov.au)
- Domestic Minimum Tax (DMT): gives Australia priority to tax low-taxed domestic profits if the country's own tax on those profits is below 15%. Also effective from 1 January 2024. (ato.gov.au)
Who’s Affected & Key Deadlines
| Entity Type | Global Revenue Threshold | Relevant Date for Application |
|---|---|---|
| Multinational groups with ≥ EUR 750 million turnover | Yes | IIR & DMT: from 1 January 2024; UTPR: from 1 January 2025 (ato.gov.au) |
These MNEs should have lodged their first Combined Global & Domestic Minimum Tax Return (CGDMTR) where required and be aware of possible top-up tax obligations. The ATO now provides API lodgment tools for this purpose. (apiportal.ato.gov.au)
Practical Examples & Implications
- Scenario 1: An Australian parent company has subsidiaries in multiple countries. If one foreign subsidiary pays taxes at an effective rate of 10%, Australia may apply top-up tax so that the total taxation meets the 15% minimum rate (using IIR).
- Scenario 2: If no IIR applies, the UTPR could allow Australia to allocate liability for under-taxed profits back to its jurisdictional entities.
Action Checklist for Compliance
- Identify whether your group meets the EUR 750 million threshold.
- Determine all jurisdictions where you operate and compute effective tax rates.
- Keep records necessary for CGDMTR, GIR, UT.P.R. filings.
- Update your accounting systems and tax reporting tools to reflect the new rules.
- Consult with international tax advisors to assess double tax issues, treaty positions, and possible reliefs.
Why This Matters
These changes enhance global tax fairness and prevent profit shifting. Non-compliance can carry penalties and reputational risks. For large multinationals, ensuring accurate calculation of taxable income and timely lodgments is now non-optional—it’s essential for legal and operating certainty in Australia.
Australia’s implementation is now law, under the Taxation (Multinational—Global and Domestic Minimum Tax) Act 2024 and related legislation. (ato.gov.au)