Expat Housing Allowance Calculator
Expat housing allowance bridges the cost of housing in the host country vs home country. Formula varies by employer: ECA International index, AIRINC, or Mercer methodology. Hong Kong + Singapore + Switzerland top the indices.
How Expat Housing Allowance Works
Employer pays differential between home country housing spend and host country comparable housing. Multiple methodologies: (1) ECA International (most common in Europe/Asia). (2) AIRINC. (3) Mercer. Each uses indexed cost of housing in 100+ cities. Standard formula: home spend × (host index / home index - 1) = allowance.
Tax Treatment Of Housing Allowance
Most countries treat housing allowance as ordinary taxable income. US 'housing exclusion' available for IRS-qualified employees under Foreign Earned Income Exclusion (FEIE) — covers part of housing cost above threshold. UK's tax treatment depends on overseas allowance election. Best practice: employer grosses up allowance to net-of-tax level for assignment letter.
Top And Bottom Index Cities
Highest indices 2025: Hong Kong (210), Singapore (185), Zurich (175), London (170), Tokyo (140). Lowest tier-1: Buenos Aires (45), São Paulo (55), Bangkok (60). US baseline 100 = midwest cities like Cleveland, Cincinnati. Higher index = larger allowance needed.
Source: ECA International Cost of Living Survey 2025, Mercer Quality of Living Index. Last updated: May 2026.