EU minimum-tax directive enforcement — state of play after the first cycles

The EU minimum-tax directive (Directive (EU) 2022/2523) was designed as a harmonisation instrument: every member state would implement the same Pillar Two rules, and an in-scope group would face a substantively identical compliance burden across the EU.

Two reporting cycles in, the picture is more variable. A practical map.

Where enforcement converges

The headline rules — 15% effective rate, GloBE income computation methodology, IIR / UTPR / QDMTT ordering — work as drafted in every member state. Groups that ran the computation in 2025 against a "directive-faithful" interpretation passed the substantive test.

Reporting templates are also converging. The OECD GloBE Information Return (GIR) is the canonical document; member-state local filings derive from it. Where the local filing diverges from the GIR, it is generally because the local tax authority added a member-state- specific data point (e.g. a separate breakdown of withholding tax positions), not because they used a different computation.

Where enforcement diverges

Domestic top-up tax interaction with existing local rules. Several member states had domestic minimum-tax-like provisions before Pillar Two (Spain's minimum tax, Italy's complementary tax, France's contribution sociale). The interaction between these legacy regimes and the new QDMTT has produced different answers in different jurisdictions on the order of computation, the deductibility of one against the other, and the treatment of withholding taxes credited against either.

Penalty regime. The penalty for an incorrect or late filing varies materially. Some member states have applied their general tax-filing penalty regime; others have introduced specific Pillar Two penalties that scale with the magnitude of the top-up tax involved. For groups filing across multiple member states, the worst-case downside on a late filing varies by an order of magnitude.

Substantive review intensity. The TIA-equivalent in some member states is reviewing first-cycle filings actively; others are processing them administratively. Filings in the active jurisdictions are receiving follow-up questions on items that the passive jurisdictions accept.

What this means in practice

For groups filing in three or more EU member states:

1. Treat the OECD GIR as the canonical document and the local filings as derivative. Maintain audit-grade documentation behind the GIR.
2. Map the penalty regime jurisdiction by jurisdiction. Late filings carry different cost profiles, and the prioritisation of internal resources should follow.
3. Plan for substantive review in the active jurisdictions. The first-cycle file is the baseline for every subsequent year; a clean first-cycle filing pays back for the next decade.