Entity Setup
What Global and Domestic Minimum Tax Means for Multinationals in Australia
New lodgement APIs and obligations under Pillar Two are in force, affecting how large multinationals report income inclusion and top-up tax in Australia.
By NomadicTax Research Team • 5-8 min read • May 9, 2026
## Overview of Global & Domestic Minimum Tax Regime (Pillar Two)
Australia has implemented the OECD’s **Model Rules** for global anti-base erosion, including the **Global Minimum Tax** for multinational enterprises (MNEs). ATO’s **Global and Domestic Minimum Tax API Product** launched 6 May 2026, now operational for lodging Combined Global & Domestic Minimum Tax Returns (CGDMTR). ([apiportal.ato.gov.au](https://apiportal.ato.gov.au/api-products/global-and-domestic-minimum-tax?utm_source=openai))
This product allows authorised entities or their tax agents to lodge three types of returns:
1. **Global Information Return (GIR)** – foreign lodgement notification when GIR is not lodged locally.
2. **Australian Income Inclusion Rule / Undetermined Top-up Payment Rule (AIUTR/DMT)** – combined domestic returns triggering Australia’s minimum tax assessments.
3. **Payment Reference Number (PRN) retrieval** for group entities that have Australian liabilities.
## Who Needs to Comply
- MNE groups with consolidated global turnover exceeding the threshold under Pillar Two rules.
- Designated Local Entities (DLEs) in Australia responsible for coordinating UTPR, IIR, and DMT obligations.
- Tax agents operating on behalf of MNEs.
## Key Practical Requirements
- **Use the ATO APIs**: Submissions must use the Global & Domestic Minimum Tax Return API, the Group Entity Tax Return API, and Payment Reference Number API. ([apiportal.ato.gov.au](https://apiportal.ato.gov.au/api-products/global-and-domestic-minimum-tax?utm_source=openai))
- **Accuracy of reporting period**: If reporting period is not exactly 12 months, an error is generated and you must contact the ATO to configure it.
- **Timely lodgment**: For entities with tax liabilities reported under these rules, original returns must be lodged with any amendments properly flagged.
## Actionable Steps & Example
- Multinational **AlphaCorp** with Australian parent: When submitting its **AIUTR/UTPR tax return**, AlphaCorp must:
- Include all Australian group entities.
- Use correct API endpoints and retrieve PRNs.
- Ensure reporting period (usually the financial year) is properly declared.
- If AlphaCorp has foreign entities participating, GIR must be lodged or foreign notification given.
## Penalties & Consequences
Failure to correctly report or to lodge via the required APIs may lead to:
- Penalties under Australia's tax administration law.
- Additional tax liabilities, interest, or shortfall interest charges.
- Reputational impact under public CBC (Country-by-Country) reporting and tax transparency rules.
## Tips for Advisors & Multinationals
- Establish internal control over global group accounting to ensure consistent reporting.
- Coordinate with tax agents well in advance of lodgment deadlines.
- Review system integrations and ensure software is up to date with ATO API instructions.
- Maintain documentary evidence for all foreign income, entity ownership, and jurisdictional income inclusion rules.
With the API product now active, moving from manual or paper-based systems to digital lodgment isn’t just about efficiency — it’s a legal requirement for many large players. Focus now to avoid penalties and ensure transparent, accurate tax reporting in line with Australia's Pillar Two commitments.