What is the Global Minimum Tax (GMT)?
Effective since the 2024 fiscal year, jurisdictions in the OECD/G20 Inclusive Framework have committed to ensuring multinational enterprises (MNEs) with consolidated revenues above EUR 750 million face a minimum effective tax rate (ETR) of 15%. Measures include the Income Inclusion Rule (IIR), Qualified Domestic Minimum Top-up Taxes (QDMTTs), and the Undertaxed Payments Rule (UTPR). (oecd.org)
For the 2024 reporting fiscal year, 37 jurisdictions have implemented one or more of these rules and are required to file a GloBE Information Return (GIR) by 30 June 2026. (oecd.org)
Key Tax Planning Strategies
| Strategy | How it works | Considerations & Examples |
|---|---|---|
| Leveraging Incentive Regimes | Use existing substance-based tax incentives and safe harbours recognised under the GMT to reduce top-up exposure. | |
| Examples: R&D incentives, investment allowances. Make sure they comply with minimum substance requirements (e.g. real employees, actual assets). | ||
| Qualified Domestic Minimum Top-Up Tax (QDMTT) | If your headquarters jurisdiction applies a QDMTT, cross-border top-ups due under IIR may be reduced or avoided. | |
| Example: MNE headquartered in Jurisdiction A, which has QDMTT at 15%. Foreign low-ETR subsidiaries’ top-ups may largely be paid domestically. | ||
| Choice of Entity & Location for Central Filing | Decide whether the Ultimate Parent Entity (UPE) or a designated filing entity will centrally file GIR to optimise cost and simplify compliance. | |
| Example: A U.S.-based group filing centrally may avoid needing multiple filing portals in other jurisdictions. Must ensure exchange relationships are in place. | ||
| Managing Exposure under UTPR (Undertaxed Payments Rule) | Use intercompany financing or royalty structures with due withholding or use of treaty-protected payments to lower risk. | |
| Example: Ensure payments that might otherwise be caught as undertaxed are subject to sufficient withholding in the paying jurisdiction and documented. |
Operational Measures & Compliance Tips
- Centralised compliance calendar: Align reporting dates (GIR due 30 June 2026 for 2024 FY) with domestic tax filings to avoid missed deadlines. (oecd.org)
- Portal readiness and jurisdiction assessments: Identify whether your group operates in jurisdictions with operational portals or excusable delays; use transitional safe harbours to avoid penalties. (oecd.org)
- Auditable documentation: Maintain records of substance, incentive eligibility, and calculations of ETRs for each entity. Enables defence in case of audits by revenue authorities.
- Cross-country consistency: Ensure tax treatments are coherent across subsidiaries, especially in relation to depreciation, interest deductions, and profit allocation. Disparities can create ETR differences triggering top-ups.
Case Example
Hypothetical: GlobalTech Inc. is headquartered in Jurisdiction X (which has a QDMTT). It has a low-tax manufacturing subsidiary in Jurisdiction Y (effective rate 5%) and a high-tax R&D center in Jurisdiction Z (25%).
- Under IIR, GlobalTech must include Y’s foreign profits. Because X has a QDMTT, the domestic 15% top-up applies rather than multiple foreign top-ups.
- GlobalTech ensures Y qualifies for substance-based incentives and files GIR centrally in X.
- It monitors exchange relationships and ensures that the GIR is shared with other jurisdictions.
Actionable Steps Starting Now
- Inventory all entities in low-ETR jurisdictions and assess whether they’re in scope of IIR, UTPR, or QDMTT regimes.
- Review existing incentive regimes for compliance with GMT substance rules. Adjust operations (staff, assets) if necessary.
- Designate a filing jurisdiction and confirm its filing portal readiness.
- Prepare GIR documentation (ETR calc, incentive use, income inclusion).
- Monitor further policy updates (OECD and EU FAQ/guidance) to adjust your plan as rules evolve.
By combining these planning strategies with operational readiness, MNEs can navigate the GMT environment with control over risk, cost, and compliance exposure.