Compliance
How Australia’s Global Minimum Tax Rules Affect Your Multinational Business
Explore Australia’s Pillar Two implementation and what the global and domestic minimum taxes mean for large multinational enterprises.
By NomadicTax Research Team • 5-8 min read • November 23, 2025
## What Are the Pillar Two Rules in Australia?
Australia has enacted legislation to implement **Key aspects of OECD’s Pillar Two** framework, aiming to ensure that large multinational enterprises (MNEs) pay a minimum level of tax—both globally and domestically. These reforms include:
- A **15% global minimum tax** under the *Income Inclusion Rule (IIR)* for fiscal years starting on or after **1 January 2024**. ([ato.gov.au](https://www.ato.gov.au/about-ato/new-legislation/in-detail/international/implementation-of-a-global-minimum-tax-and-a-domestic-minimum-tax?utm_source=openai))
- The **Undertaxed Profits Rule (UPR)** applying from **1 January 2025**. ([ato.gov.au](https://www.ato.gov.au/about-ato/new-legislation/in-detail/international/implementation-of-a-global-minimum-tax-and-a-domestic-minimum-tax?utm_source=openai))
- A **domestic minimum tax** that applies from **1 January 2024**. ([ato.gov.au](https://www.ato.gov.au/about-ato/new-legislation/in-detail/international/implementation-of-a-global-minimum-tax-and-a-domestic-minimum-tax?utm_source=openai))
## Who’s in Scope?
If your company group meets the following, you’re likely affected:
- Global annual revenue of **EUR 750 million or more**. ([ato.gov.au](https://www.ato.gov.au/about-ato/new-legislation/in-detail/international/implementation-of-a-global-minimum-tax-and-a-domestic-minimum-tax?utm_source=openai))
- Part of a group with entities in multiple jurisdictions. The new rules apply per jurisdiction where income is generated. ([ato.gov.au](https://www.ato.gov.au/about-ato/new-legislation/in-detail/international/implementation-of-a-global-minimum-tax-and-a-domestic-minimum-tax?utm_source=openai))
## Key Compliance Deadlines & Obligations
| Requirement | What You Need to Do | Deadline / Effective Date |
|-------------|----------------------|-----------------------------|
| File GloBE Information Return (GIR) | Provide data on group-wide low taxation. | Fiscal years after 1 Jan 2024 (IIR) and 1 Jan 2025 (UPR). ([ato.gov.au](https://www.ato.gov.au/about-ato/new-legislation/in-detail/international/implementation-of-a-global-minimum-tax-and-a-domestic-minimum-tax?utm_source=openai)) |
| Domestic Minimum Tax returns | Report income taxed below 15% in Australia. | Same fiscal periods. ([ato.gov.au](https://www.ato.gov.au/about-ato/new-legislation/in-detail/international/implementation-of-a-global-minimum-tax-and-a-domestic-minimum-tax?utm_source=openai)) |
| Pay top-up tax | If global or domestic effective rate falls under 15%. | Aligned with return lodgment. ([ato.gov.au](https://www.ato.gov.au/about-ato/new-legislation/in-detail/international/implementation-of-a-global-minimum-tax-and-a-domestic-minimum-tax?utm_source=openai)) |
## Practical Insights & Examples
- If one of your foreign subsidiaries achieves an effective tax rate of 10%, Australia’s rules could force your group to pay a **5% top-up** tax on that low-taxed income.
- Use **transfer-pricing documentation**, close review of IP location, financing arrangements, or operations that might push profit to low-taxed jurisdictions to avoid triggering additional tax burdens.
- Early engagement with tax counsel and upgrading systems to capture required data is essential since the GIR and associated returns will be detailed and extensive.
## How It Impacts Your Strategy
- **Operational Structuring**: Rethink where you hold intangible assets, how you finance subsidiaries, and where value is added.
- **Cash Flow Management**: Unexpected top-up tax liabilities could arise; ensure provision in budgeting.
- **Disclosure Risk**: These rules involve increased transparency, so inadequate compliance could attract scrutiny or penalties.
Australia’s Pillar Two implementation reflects a global shift toward tax fairness. For businesses in scope, adopting strong compliance systems, reviewing existing structures, and planning for added reporting and tax liabilities is now a priority.
**Actionable Steps**:
1. Conduct a **Pillar Two readiness audit** to identify gaps in data, documentation, and finance structure.
2. Liaise with external advisors to assess your effective tax rate in every jurisdiction where your group operates.
3. Implement governance controls to ensure accurate and timely reporting under GIR and domestic minimum tax.
4. Evaluate existing cross-border arrangements for substance, purpose and documentation—unauthorised arrangements could be targeted under the general anti-avoidance rule.
With the start dates already passed for many rules, now is not the time to wait—proactive steps will minimize unwelcome shocks in both compliance and finances.