CAMT vs Pillar Two — US Minimum Tax vs OECD Global Minimum Tax
Comprehensive comparison of the US Corporate Alternative Minimum Tax and OECD Pillar Two GloBE rules for multinational enterprises.
Two Minimum Tax Regimes
Multinational enterprises face two distinct minimum tax frameworks: the US CAMT (Corporate Alternative Minimum Tax, effective 2023) and OECD Pillar Two GloBE rules (effective 2024+). While both impose a 15% minimum rate, they differ fundamentally in scope, tax base, and mechanics.
Key Differences
Understanding the critical distinctions between CAMT and Pillar Two is essential for compliance and planning.
- Scope — CAMT targets US corporations with $1B+ average AFSI; Pillar Two targets MNE Groups with €750M+ consolidated revenue
- Tax Base — CAMT uses adjusted financial statement income (book income); Pillar Two uses GloBE Income derived from financial accounting profit with specific adjustments
- Rate — Both impose 15% minimum, but calculated differently
- Crediting — CAMT allows foreign tax credits; Pillar Two uses a top-up tax mechanism applied jurisdiction by jurisdiction
- Safe Harbors — Pillar Two includes transitional CbCR safe harbors; CAMT has different relief provisions
Compliance Strategy
Companies subject to both regimes must coordinate their compliance processes. Clarity Tax automates both CAMT and Pillar Two calculations, identifying interactions and credits between the two systems to minimize compliance burden and tax leakage.