Compliance
Understanding the Global & Domestic Minimum Tax Rules for Multinationals
Australia’s minimum tax rules under Pillar Two are now law—this article breaks down who’s affected, what to prepare, and how to comply.
By NomadicTax Research Team • 6 min read • April 19, 2026
## What Are the Rules?
- Australia has implemented both the **Global Minimum Tax** and **Domestic Minimum Tax** as part of the OECD Pillar Two framework. ([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))
- These rules are now law, via the Taxation (Multinational—Global and Domestic Minimum Tax) Act 2024 and related legislation. ([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 dates:
• **Income Inclusion Rule** & **Domestic Minimum Tax (DMT)** apply 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))
• **Undertaxed Profits Rule** applies 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))
## Who’s In Scope?
- Large multi-national enterprise (MNE) groups with **annual 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))
- Both Australian headquartered and foreign headquartered entities that have operations in Australia. The domestic minimum tax ensures Australia can tax low‐taxed profits within its jurisdiction. ([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))
## What the Rules Do
- If a group earns income in other jurisdictions taxed below 15%, Australia can apply a **top-up tax** so that income is effectively taxed at 15% (Global Minimum Tax).
- If certain Australian income is taxed below 15%, the **Domestic Minimum Tax** applies ensuring Australia gets first claim.
- MNEs must lodge a **GloBE Information Return (GIR)** and domestic tax forms to report income, taxes paid, and compute top-up tax obligations. The ATO is developing systems and guidance. ([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))
## Compliance & Administrative Changes
- Filing begins with reporting periods from **1 January 2024** or **1 January 2025** depending on rule. Paperwork, tax calculations, and electronic lodgment systems are now being built/deployed. ([ato.gov.au](https://www.ato.gov.au/media-centre/key-developments-in-tax-administration-in-australia?utm_source=openai))
- Transitional relief & leniency around penalties is expected where MNEs have taken “reasonable measures” to comply while systems and guidance mature. ([ato.gov.au](https://www.ato.gov.au/media-centre/key-developments-in-tax-administration-in-australia?utm_source=openai))
## Example Scenarios
- A large foreign-headquartered company with Australian operations earning low profit abroad taxed at 10% now must face top-up tax in Australia so that rate is boosted to 15% on that income.
- An Australian company with domestic profits taxed at effective rate of 12% will now pay more through domestic minimum tax to bring that slice up to 15%.
## What You Should Do
1. **Determine if you’re in scope**: start by assessing whether your global group meets the EUR 750 million revenue threshold.
2. **Begin preparations early**: strengthen international tax mapping, ensure transfers, royalties, and intangible assets are appropriately documented.
3. **Review current effective tax rates** in jurisdictions where you are operating to anticipate top-ups.
4. **Engage software and external advisors** to implement compliance tools and make sure reporting obligations are ready for when required.
5. **Stay updated on guidance**: subordinate legislation, ATO rulings, and public advice which clarify application (e.g. definitions, enforcement, transitional relief).
## Bottom Line
These rules represent a major change in global tax architecture. For large multinational firms, the implications touch accounting, structuring, financial reporting, and tax compliance. Getting ahead now can reduce surprises and compliance risks down the line.