Expat Tax Equalization Calculator
Calculate expat tax equalization — the hypothetical home-country tax versus host-country tax burden. Used by HR teams and expats to ensure employees on international assignment pay no more tax than at home.
The Tax Equalization Concept
Tax equalization protects expats from paying more tax abroad than they would at home. Employer pays the host-country tax in excess of the 'hypothetical' home-country tax (hypotax). Employee experiences the same net pay regardless of assignment country. Used by 60%+ of large multinationals (KPMG Global Assignment Policies Survey). Critical for moves from low-tax (US, Singapore) to high-tax (UK, Germany, France).
Hypotax — The Foundation
Hypotax = the federal/state income tax + social security the employee WOULD owe if they had stayed home with their normal compensation. Calculated annually using home-country rates. Employer deducts hypotax from gross pay (instead of actual taxes), then handles all actual tax filings — home and host. Employee never sees tax forms during assignment.
Foreign Tax Credit and Foreign Earned Income Exclusion
US citizens abroad must still file US returns. Two relief mechanisms: (1) Foreign Earned Income Exclusion (FEIE): exclude $130,000 (2026 limit) of foreign-earned wages if pass physical-presence test (330 days abroad) or bona fide residence test. (2) Foreign Tax Credit (FTC): credit against US tax for foreign taxes paid. Cannot double-dip — FEIE excluded income can't generate FTC. High-tax country = use FTC; low-tax country = use FEIE.
Common Equalization Pitfalls
Pitfall 1: equity vesting during assignment creates source allocation issues (income split between home/host based on workdays during vesting period). Pitfall 2: spouse income not always covered. Pitfall 3: housing allowance has different tax treatment (taxable in US, tax-free in some countries). Pitfall 4: tail period — repatriation year typically has trailing equalization for prior-year items. Most policies tail 1-2 years post-return.
Sources: IRS Pub 54 (Tax Guide for US Citizens Abroad), KPMG Global Assignment Policies. Last updated: May 2026.
Frequently Asked Questions
What is tax equalization?
Employer policy ensuring expats pay no more tax abroad than at home. Employer covers excess host-country tax. Employee pays 'hypotax' (hypothetical home-country tax). 60%+ of large multinationals use this policy.
What is hypotax?
Hypotax = the tax the employee WOULD owe in home country with their normal comp. Deducted from gross pay instead of actual taxes. Employer handles all real tax filings.
What is foreign earned income exclusion?
US citizens abroad can exclude $130,000 (2026 limit) of foreign-earned wages from US tax IF they pass physical presence (330 days) or bona fide residence test. Cannot stack with foreign tax credit on same income.
When does FTC beat FEIE?
Foreign Tax Credit better for high-tax host (UK, Germany, France) \u2014 credit fully offsets US tax. FEIE better for low/no-tax host (UAE, Singapore) \u2014 exclude full amount, save on US tax with no foreign credit to use.
Is this tool free?
Yes. 100% free, no sign-up. All math runs in your browser \u2014 your comp data never leaves your device. Not tax advice \u2014 consult international tax CPA.