Compliance
Compliance Essentials Under OECD Pillar 2: A Guide for Multinationals
With Pillar 2 now in effect in many jurisdictions, businesses must overhaul compliance systems—this article helps map the landscape and stay ahead.
By NomadicTax Research Team • 5-8 min read • August 23, 2026
## Overview of OECD Pillar 2 Compliance
Pillar 2 introduces two core rules:
- **Income Inclusion Rule (IIR):** Allows a parent jurisdiction to tax its multinational group’s income if it’s taxed below the 15% minimum in other jurisdictions.
- **Undertaxed Profits Rule (UTPR):** Allows jurisdictions where profits are generated to impose top-ups if income isn’t taxed adequately elsewhere.
Additionally, jurisdictions may adopt Qualified Domestic Minimum Top-Up Taxes (QDMTTs), which serve as local equivalents of IIR to avoid UTPR being imposed. ([imf.org](https://www.imf.org/_next/data/QUjzBoI7IlSWld0ujG2VL/en/-/media/files/publications/books/2026/english/tmenaea.pdf.json?utm_source=openai))
## Key Compliance Steps for MNEs
1. **Assess Jurisdictional Legislation**
- Check whether countries in your group have adopted IIR, UTPR, or QDMTTs, and whether they’re “2024 Implementing Jurisdictions”.
- Understand local safe-harbour mechanisms like Side-by-Side (SbS) or UPE Safe Harbour. ([oecd.org](https://www.oecd.org/en/about/news/announcements/2026/05/global-minimum-tax-release-of-a-common-understanding-of-implementing-jurisdictions-and-further-administrative-guidance-to-support-compliance.html?utm_source=openai))
2. **Central Filing vs Local Filing**
- Central filing in the UPE (Ultimate Parent Entity) or designated entity can streamline compliance. Some jurisdictions agreed that penalties may be waived or enforcement delayed if central filing is done, even if some jurisdictions are not yet operationally ready. ([oecd.org](https://www.oecd.org/en/about/news/announcements/2026/05/global-minimum-tax-release-of-a-common-understanding-of-implementing-jurisdictions-and-further-administrative-guidance-to-support-compliance.html?utm_source=openai))
3. **Data Collection Needs**
- Gather granular data—effective tax rates globally, business operations per jurisdiction, profits, tax paid and accrued—for tabulation in GIR (GloBE Information Return).
- Track changes in accounting periods, especially fiscal year variants (e.g., 53-week years), that can affect safe-harbour eligibility. ([oecd.org](https://www.oecd.org/en/about/news/announcements/2026/05/global-minimum-tax-release-of-a-common-understanding-of-implementing-jurisdictions-and-further-administrative-guidance-to-support-compliance.html?utm_source=openai))
4. **IT Systems, Reporting Portals**
- Jurisdictions are rolling out portals and templates; delays in exchange relationships may occur. Anticipate these technical requirements.
- Use model rules and guidance from the OECD to align your templates. Implement or upgrade systems to support country-level reporting.
5. **Managing Exposure**
- Conduct scenario analyses: Where is your low taxed income? What jurisdictions are non-operational? Could penalties or adverse UTPR consequences apply?
- Explore whether you qualify for safe harbours (e.g. SbS or UPE Safe Harbour once effective from 1 January 2026 for certain groups).
## Example Timeline & Impact
Imagine a multinational with entities in A, B, and C: A becomes UPE, files GIR centrally. B has a general corporate rate of 10%, C has a low rate of 5%. If A or C don’t have QDMTT, UTPR in B might trigger top-ups.
By 31 May 2027, file GIR; if central filing is accepted and jurisdictions are operational, penalties may be mitigated. If local legislation isn’t in place, risk exposure to back-dated top-ups or inconsistent enforcement.
## Best Practices to Stay Ahead
- Perform regular internal audits of your tax incentives and ensure they include sufficient substance to qualify under GMT’s rules.
- Keep up with jurisdiction listings in the OECD’s “Central Record” (which tracks which jurisdictions have adopted IIR/QDMTT etc.).
- Engage with national revenue authorities to understand where transitional reliefs or exceptions may apply.
- Budget for compliance costs: data, systems, external advisory, possibly increased tax liability.
## Final Takeaway
Pillar 2 compliance is no longer optional for large multinationals—it’s now part of doing business globally. Early action in understanding where you’re exposed, gathering the right data, and aligning with jurisdictions ready under GMT will save companies from penalties and reputational risk down the line.