Entity Setup
Multinationals and the Global Minimum Tax: What Private Groups Need to Know
Australia now has Pillar Two and domestic minimum tax rules in force — private multinationals should ensure their thin capitalisation, debt structuring and overseas tax payments comply.
By NomadicTax Research Team • 5-8 min read • March 6, 2026
## Australia’s Minimum Tax Regime Explained
Australia has passed new legislation to implement both the **OECD’s Pillar Two Global Minimum Tax Model Rules** and a **domestic minimum tax**. These laws are now in effect. ([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 features include:
- A **15% global minimum tax rate** (GloBE) on in-scope Multinational Enterprise (MNE) groups.
- Income Inclusion Rule (IIR) applies from **1 January 2024**, Undertaxed Profits Rule (UTPR) from **1 January 2025**.
- A **domestic minimum tax** that ensures Australia can collect revenue on low-taxed income within its jurisdiction, even if global rules would apply elsewhere. ([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 Is In Scope & What Rules Apply
- MNE groups with **global turnover above EUR 750 million**.
- Corporations in Australia that are part of such groups will have to disclose via the ATO’s GloBE Information Return (GIR). ([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))
- **Thin capitalisation rules** and **Debt Deduction Creation Rules (DDCR)** now limit the ability to shift profits via debt or related-party loans. ([ato.gov.au](https://www.ato.gov.au/businesses-and-organisations/international-tax-for-business/private-wealth-international-program/new-international-tax-measures-affecting-private-groups?utm_source=openai))
## Practical Compliance and Planning Insights
- **Review related-party financing** arrangements. Ensure interest rates, debt levels, and documentation stand up under the new tests (Fixed Ratio, Group Ratio, Third Party, etc.). ([ato.gov.au](https://www.ato.gov.au/businesses-and-organisations/international-tax-for-business/private-wealth-international-program/new-international-tax-measures-affecting-private-groups?utm_source=openai))
- **Assess tax jurisdictions**: Profits being taxed overseas at rates lower than 15% may trigger top-ups under Australian IIR or UTPR rules.
- **Accurate reporting and timing**: Familiarise with GIR filings, ensure data systems can capture required information, and manage any deferred tax positions.
## Example Scenario
> A private-owner Australian company (turnover > EUR 750m globally) has an overseas subsidiary in a jurisdiction taxed at 10%. Under Pillar Two/GloBE, Australia may impose a top-up tax to bring the effective rate to 15%. Also, if domestic income streams are taxed below threshold, domestic minimum tax rules could apply.
By contrast, a smaller business with no international exposure will not fall under Pillar Two but should monitor thin capitalisation changes if it has foreign controlled affiliates.
## Steps to Action
1. Identify whether your group is **in scope**, based on revenue and structures.
2. Audit your debt levels and related party debt to ensure compliance with the new thin-capitalisation rules and DDCR.
3. Update your tax-systems and reporting tools to capture necessary information for GIR and associated filings.
4. Consult with transfer pricing specialists to assess risk in cross-border royalties, IP payments, and intangible asset structuring.
## Bottom Line
These international tax changes are **high-impact** for large private groups with multinational operations. Understanding where your group stands, reviewing debt financing, and upgrading reporting processes are essential steps. With law now in effect, non-compliance risk and potential tax liabilities have legwork behind them—so better to engage now than retrospectively clean up later.