What is Pillar Two (Global Minimum Tax)?

How it works

Pillar Two is the second of two pillars in the OECD/G20 Inclusive Framework on BEPS — a coordinated effort by 140+ countries to close the gaps in international tax. While Pillar One (reallocation of taxing rights for the largest digital companies) remains stalled (per PwC US Significant Developments: "consensus on so-called 'Pillar One' has been elusive"), Pillar Two has rolled out broadly, with major economies implementing the GloBE Rules from 2024.

Scope: multinational enterprise groups with consolidated revenue ≥ €750 million in at least 2 of the 4 prior fiscal years. Smaller groups are out.

The mechanism: every constituent entity in scope is tested against the 15% global minimum effective tax rate (ETR) in each jurisdiction where it operates. Where the ETR falls short, top-up tax equal to the shortfall × the entity's GloBE income is collected via one of three instruments:

1. QDMTT (Qualified Domestic Minimum Top-Up Tax): collected by the source jurisdiction itself. Priority over IIR/UTPR — countries that introduce a QDMTT keep the top-up revenue domestically rather than ceding it to other jurisdictions.
2. IIR (Income Inclusion Rule): collected by the parent jurisdiction of the multinational group. Applies when a low-taxed constituent entity exists in another jurisdiction.
3. UTPR (Undertaxed Profits Rule): backstop. Collected by sister or sub jurisdictions when neither QDMTT nor IIR has captured the top-up.

The order of priority: QDMTT first, then IIR, then UTPR.

Implementation status (as of 2026)

• EU: Pillar Two Directive (2022/2523) implemented across member states from 2024 (IIR + QDMTT) and 2025 (UTPR).
• UK: Multinational Top-Up Tax in force from 2024.
• South Korea, Japan, Canada, Australia: implemented from 2024.
• UAE: introduced QDMTT for in-scope groups from 2025.
• Cayman, Bermuda: QDMTTs introduced to retain top-up revenue.
• Switzerland: QDMTT in force from 2024.

US position

The US has not implemented Pillar Two — neither IIR, UTPR nor QDMTT exists in US domestic law. The Trump administration and Congressional Republicans publicly opposed Pillar Two and considered retaliatory measures (the unenacted "Section 899" was an example).

Per PwC US Significant Developments (March 2026):

The OECD subsequently announced that 147 members of the Inclusive Framework on BEPS have agreed to a new package of administrative guidance under the Pillar Two GloBE rules. The package includes several safe harbours, and most importantly, the United States is identified as qualifying for a side-by-side safe harbour under which multinationals headquartered in a qualifying jurisdiction are eligible to have no top-up tax under the Pillar Two Income Inclusion Rule and Undertaxed Profits Rule across all their domestic and foreign operations (including interests in joint ventures and joint venture subsidiaries).

In effect: US multinationals are largely shielded from foreign-jurisdiction Pillar Two top-up taxes via the side-by-side safe harbour, provided the US continues to qualify as a side-by-side jurisdiction. Foreign-headquartered multinationals operating in the US do face Pillar Two in their home jurisdictions, but US operations are largely covered by US domestic tax.

Examples

• EU-headquartered group with €1B revenue, BVI holding subsidiary earning €50M passive income. BVI: 0% corporate tax. ETR test fails (0% < 15%). BVI introduced a QDMTT in 2025; QDMTT collects 15% × €50M = €7.5M domestically. IIR in EU parent state doesn't trigger — QDMTT priority absorbs the top-up.
• US-headquartered group with €5B revenue, UK subsidiary earning £100M with effective 22% UK CIT. ETR exceeds 15% — no Pillar Two top-up. US is also qualifying side-by-side jurisdiction → US operations of US multinationals shielded from Pillar Two challenges in foreign IIR/UTPR jurisdictions.

Common mistakes

• Assuming you're in scope at low revenue. €750M consolidated revenue threshold is genuine — most SMEs are out.
• Ignoring the QDMTT priority. A UAE Free Zone group thinking "0% UAE → top-up will go to my parent country" forgets the UAE QDMTT now captures it locally first.
• Trusting the US safe harbour as permanent. The side-by-side safe harbour depends on the US continuing to qualify; the OBBBA + future US-OECD diplomacy can shift the landscape. Track developments.
• Forgetting filings. In-scope groups must file the GloBE Information Return (GIR) — first filings due end of June 2026 per PwC. Compliance burden is non-trivial.