Compliance

Navigating Global Minimum Tax (Pillar Two) Rules: Compliance Steps for Australian Multinationals

Australia has enacted OECD Pillar Two minimum tax rules. Multinational entities need to act now to align systems, understand obligations and leverage safe harbours.

By NomadicTax Research Team • 5-8 min read • March 4, 2026

## What is Pillar Two in Australia? Australia has implemented **Global and Domestic Minimum Tax** rules under the OECD/G20 framework (Pillar Two): the **Income Inclusion Rule (IIR)** and **Domestic Minimum Tax (DMT)** from fiscal years beginning **1 January 2024**, and the **Undertaxed Profits Rule (UTPR)** from **1 January 2025**. ([ato.gov.au](https://www.ato.gov.au/businesses-and-organisations/international-tax-for-business/in-detail/multinationals/global-and-domestic-minimum-tax?utm_source=openai)) These apply to large multinational enterprise (MNE) groups with global 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)) ## Key compliance requirements - **GloBE Information Return (GIR)**: In-scope entities must lodge the GIR and any domestic minimum tax returns. Rules are effective now. ([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 Return**: Where Australia’s effective tax rate drops below 15% for certain domestic income, this rule ensures Australia claims primary rights over top-up tax. ([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)) - **Country by Country Reporting Safe Harbours**: For fiscal years starting before **31 December 2026**, transitional safe harbours apply in certain jurisdictions to simplify reporting. ([ato.gov.au](https://www.ato.gov.au/about-ato/consultation/in-detail/special-purpose-working-groups-key-messages/pillar-two-global-and-domestic-minimum-tax-working-group/pillar-two-global-and-domestic-minimum-tax-working-group-key-messages-3-april-2025?utm_source=openai)) ## Systems, election options, and technical points - MNEs with **Tax-Consolidated Groups (TCGs)** or Multiple Entry Consolidated groups must carefully examine how constituent entities are treated for GIR and top-up tax allocation. ([ato.gov.au](https://www.ato.gov.au/about-ato/consultation/in-detail/stakeholder-relationship-groups-key-messages/energy-and-resources-working-group/energy-and-resources-working-group-key-messages-20-november-2024?utm_source=openai)) - There are **elections for aggregate reporting** and **simplified jurisdictional reporting** allowed where certain thresholds and conditions are met—useful to reduce complexity. ([ato.gov.au](https://www.ato.gov.au/about-ato/consultation/in-detail/special-purpose-working-groups-key-messages/pillar-two-global-and-domestic-minimum-tax-working-group/pillar-two-global-and-domestic-minimum-tax-working-group-key-messages-3-april-2025?utm_source=openai)) - Keep records consistent with financial accounting standards, especially regarding joint ventures or operations where “separate financial accounts” are required. Distinguishing joint venture vs joint operation may affect reporting scope. ([ato.gov.au](https://www.ato.gov.au/about-ato/consultation/in-detail/special-purpose-working-groups-key-messages/pillar-two-global-and-domestic-minimum-tax-working-group/pillar-two-global-and-domestic-minimum-tax-6-march-2025imum-tax-wgkm-6-march-2025?utm_source=openai)) ## Risks of non-compliance - Penalties for failure to lodge GIR or DMT returns when required. - Interest or additional liabilities if top-up taxes are not paid or assets not disclosed properly. - Public reputational risk—large MNEs are under increasing scrutiny. ## Actionable steps for multinationals 1. Perform a **readiness assessment**: financials, tax practices, operations to see if any part of your income or entities fall under minimum tax rules. 2. Update reporting systems and digital infrastructure to capture data for GIR, including entity-by-entity income, taxes paid, profit allocation, and cross-border flows. 3. Review use of safe harbours and elections to reduce reporting burden. If eligible, apply aggregate reporting or jurisdictional safe harbours. 4. Seek early advice on implications for tax rates in jurisdictions where you operate with low or no taxation. 5. Document key decisions and compliance efforts: elections made, data assumptions, time-lines followed—critical if law changes retrospectively. ## Example scenario Suppose *GlobalCo Ltd.*, an MNE with headquarters in Sydney and subsidiaries in several countries, has total revenue exceeding EUR 750 million. The company discovers that one overseas subsidiary has a very low effective tax rate (say 5%), dragging down profitability overall. Under IIR or UTPR, Australia needs to levy additional tax (top-up) to bring that income up to 15%. GlobalCo must determine whether the overseas operation qualifies for a safe harbour, whether the domestic minimum tax applies, and lodge the GIR. Without proper systems, they risk substantial liabilities and penalties. With these rules now firmly in place, **acting early** ensures smoother compliance, less unexpected tax exposure, and effective use of elections and safe harbours available.