What is GILTI and how does it affect a US multinational's effective tax rate?

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AcadiFi · Accepted Answer

GILTI (Global Intangible Low-Taxed Income, IRC §951A) subjects US shareholders of Controlled Foreign Corporations to current US tax on foreign earnings that exceed a 10% return on tangible assets. It's designed to discourage parking intangible income (IP) in low-tax jurisdictions.

Formula: GILTI = Net CFC Tested Income − 10% × QBAI (Qualified Business Asset Investment, basically tangible depreciable property). A §250 deduction of 50% (dropping to 37.5% after 2025) applies to US corporate shareholders, yielding an effective GILTI rate of 10.5% pre-2026 (21% × 50%) and 13.125% thereafter. Foreign tax credits partially offset GILTI tax but with an 80% haircut and no carryforward/carryback.

For Helios Semi:
- Tested income: $500M
- QBAI return: 10% × $200M = $20M
- GILTI inclusion: $500M − $20M = $480M
- §250 deduction: $480M × 50% = $240M
- Taxable GILTI: $240M
- Pre-credit US tax: $240M × 21% = $50.4M
- Effective GILTI rate: $50.4M / $480M = 10.5%

If Irish tax on the $480M is 12.5% = $60M, FTC allowed = 80% × $60M = $48M, fully offsetting the $50.4M pre-credit tax. Net US GILTI = $2.4M.

Analyst angle: (1) companies with high tangible asset bases (manufacturers) enjoy larger QBAI shields; (2) IP-heavy firms (pharma, software) bear full GILTI; (3) post-2025 the effective rate rises to 13.125%, a headwind for FY26 earnings; (4) Pillar Two's 15% QDMTT may moot GILTI for many jurisdictions — track Treasury guidance on FTC coordination.

What is GILTI and how does it affect a US multinational's effective tax rate?

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