Tax Planning
How Global Minimum Tax (‘Pillar 2’) Affects Multinationals: Planning & Compliance Strategies
Companies operating internationally must adapt to the Global Minimum Tax under the OECD/G20 Inclusive Framework—this article outlines what it is, who’s affected, and how to align operations.
By NomadicTax Research Team • 5-8 min read • August 14, 2026
## What is ‘Pillar 2’ Global Minimum Tax (GMT)?
The **Global Minimum Tax** (also known as Pillar 2) is a coordinated international effort under the OECD/G20 Inclusive Framework aimed at setting a minimum effective tax rate for large multinational enterprises (MNEs) wherever they operate. It’s designed to deter profit-shifting and ensure jurisdictions can still collect some tax revenue from large corporations doing business across borders. Key features include the Global Anti-Base Erosion (GloBE) rules, income inclusion and undertaxed payments rules. Regulations are evolving, but many countries are making legislative changes to align with the Pillar 2 model rules. ([gov.uk](https://www.gov.uk/government/publications/hmrc-transformation-roadmap-progress-update-2026/annex-summary-of-hmrcs-planned-activities-listed-in-this-transformation-roadmap-progress-update?utm_source=openai))
## Who is affected and when?
- Multinationals with **consolidated group revenues above a threshold** (often around EUR 750 million or equivalent) will need to report.
- Jurisdictions including the UK are finalizing legal frameworks and IT systems to enforce GMT compliance and align their tax laws with OECD-wide model rules. In the UK, it’s expected to raise approximately £1.7 billion per year from 2029-30 onward. ([gov.uk](https://www.gov.uk/government/publications/hmrc-transformation-roadmap-progress-update-2026/annex-summary-of-hmrcs-planned-activities-listed-in-this-transformation-roadmap-progress-update?utm_source=openai))
- Companies with subsidiaries or branches in globally diverse locations will need to monitor **foreign income**, **tax credits**, and the extent of effective foreign tax rates to ensure compliance.
## Planning strategies to consider
- **Tax rate mapping**: Assess all entities’ local effective tax rates to identify areas of under-taxation or risk exposure.
- **Structuring intercompany financing**: Interest, royalties, and other cross-border payments may trigger the undertaxed payments rule—evaluate whether structures can be adjusted.
- **Use of tax credits and incentives**: Local R&D credits or investment incentives can help raise effective rates; ensure you maintain documentation to support enrolment.
- **Reporting readiness**: Build capacity for financial reporting, especially when disclosures of consolidated profit and tax per jurisdiction are required under GloBE Information Returns (GIRs).
## Compliance challenges & mitigation
| Challenge | Mitigation Strategy |
|-----------|----------------------|
| Complex jurisdictional differences | Regular legal reviews and coordinating with local counsel/accountants in each country |
| Timing misalignment | Use projections and interim data before full implementation; align fiscal-year entities where possible |
| Data collection & reporting burden | Invest in tax-reporting systems; integrate tax and accounting platforms; ensure intercompany transaction documentation is robust |
| Unexpected tax costs from silent indirect exposures | Conduct stress testing for potential top-ups or under-taxed income exposures |
## Example scenario
An MNE domiciled in Country A has subsidiaries in Countries B and C. Country B has a 10% tax rate; Country C has 18%. If the global minimum rate is set at 15%, then income taxed at 10% in B may trigger the **income inclusion rule**, requiring top-up taxation in Country A to bring the effective rate up to 15%. The company might reorganize intra-group flows, shift certain functions, or leverage incentives in B to increase effective taxation there.
## Action steps for multinational businesses now
1. Conduct a **Pillar 2 readiness assessment**, mapping revenues, tax rates, and incentive credits by jurisdiction.
2. Update intercompany documentation and policies to support new information reporting and possible top-up liabilities.
3. Monitor legislative developments in each jurisdiction; for example, UK law is evolving via its Finance Acts and interim rules. ([gov.uk](https://www.gov.uk/government/publications/hmrc-transformation-roadmap-progress-update-2026/annex-summary-of-hmrcs-planned-activities-listed-in-this-transformation-roadmap-progress-update?utm_source=openai))
4. Align tax planning and budgeting for potential increases in tax costs due to top-ups or compliance investment.
5. Consult advisers familiar with GloBE rule implementation and local tax incentives.
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**Bottom line:** Global Minimum Tax changes make cross-border tax planning non-optional. Firms that align early with reporting, documentation, and planning requirements will manage risk and optimize outcomes, while those who delay may face unanticipated tax liabilities and compliance burdens.