“Effective tax rates rose by 2.8-3.7 p.p. on average for in-scope multinationals in 2025.” That finding, from a new OFC/OECD report, has urgent compliance implications for EU multinationals. (oecd.org)
What Are DAC9 and Pillar 2?
- Pillar 2 Directive (Council Directive EU 2022/2523) establishes minimum effective tax rate rules for large multinational enterprise groups (MNEs) and large-scale domestic groups (LSDGs) in the EU. Reporting obligations include “top-up tax information returns”. (taxation-customs.ec.europa.eu)
- DAC9 (Directive on Administrative Cooperation, latest amendment) aligns with Pillar 2 by easing the administrative burden: one central filing per group, common templates, and clearer obligations. (oecd.org)
Recent Developments
- An updated OECD analysis (July-August 2026) found that implementation of the Global Minimum Tax (GMT) is reducing tax differentials and profit-shifting; global corporate income tax revenues may increase by 3.2-5.4% annually due to GMT effects. (oecd.org)
- Under Pillar 2, Cyprus has been confirmed via Commission FAQ as having a “qualified Income Inclusion Rule” for returns from fiscal years starting 31 December 2023; Member States must accept it in their interactions under DAC9. (taxation-customs.ec.europa.eu)
What EU Multinationals Need to Do: Compliance Checklist
| Compliance Area | Key Requirement | Action Step |
|---|---|---|
| Top-up tax returns | MNEs/LSDGs must file returns as prescribed under Pillar 2 | Map constituent entities, thresholds, fiscal year alignment; gather financial data to calculate effective tax rates |
| Single-group filing under DAC9 | Only one return per group centrally, using standard forms | Coordinate across jurisdictions; ensure that group-wide data systems can support consistent reporting templates |
| FAQ/Guidance monitoring | Interpretations (e.g. Cyprus’s status) can affect mutual acceptance and filing obligations | Monitor European Commission FAQs; update internal compliance processes accordingly |
| Systems & data readiness | Effective rate calculations require quality data across jurisdictions | Establish robust accounting, data collection, audit traceability; engage advisors for jurisdictions with weak infrastructure |
Challenges & Risks to Watch
- Differing Member State implementations: Even with EU Directives, national laws implementing Pillar 2 or DAC9 may vary in readiness or interpretation. Late implementing states may pose risks. |
- Basis mismatches and double taxation – mismatches in what counts as “income inclusion” or treatment of exclusions can lead to over-taxation or disputes. |
- Documentation and audit risk – tax authorities are likely to scrutinize effective tax rate calculations, exclusions, and the use of credits or deductions.
Example Scenarios
- An EU-based tech group with subsidiaries in low-tax jurisdictions: Facing top-up liability under Pillar 2 where subsidiaries fall below minimum rate; must ensure group filing under DAC9 avoids duplication. |
- A financial firm with large profits: OECD estimates suggest good increases in effective tax rates; planning for excess profit taxes or surtaxes in various jurisdictions is prudent. |
Best Practices Moving Forward
- Begin internal gap analysis now, before your next fiscal year closes.
- Map exposures by country and business line; engage in pre-filing quality controls. |
- Use advisory experts for contentious areas (e.g., related party income, carve-outs, digital activities). |
- Monitor EU implementation status in each Member State to anticipate divergent rules or delays. |
With DAC9 and Pillar 2 fully in force and OECD analysis showing high stakes, proactive EU multinationals will avoid costly surprises.