Understanding citizenship-based taxation: A guide for US expats
In the global landscape of taxation, most countries adopt a residency-based approach, taxing individuals based on where they live.
However, the United States stands out with its citizenship-based taxation system. This means that US citizens are taxed on their worldwide income, regardless of where they reside.
For American expatriates, this unique system introduces complexities in tax obligations, making it essential to understand the nuances of both taxation models.
Residency vs. citizenship-based taxation
What is residency-based taxation?
Residency-based taxation is a system where individuals are taxed based on their residency status within a country.
If you're considered a resident, you're liable to pay taxes on your global income in that country. Conversely, non-residents are typically taxed only on income sourced within that country.
Countries that employ residency-based taxation include:
- Canada
- United Kingdom
- Australia
- Germany
- Japan
- Mexico
- New Zealand
- Most European Union nations
In these countries, determining tax residency often depends on factors like the number of days spent in the country, permanent home availability, and personal and economic ties.
What is citizenship-based taxation?
Citizenship-based taxation is a system where a country taxes its citizens on their worldwide income, regardless of where they live or earn that income.
The United States is the most prominent example of this system.
Countries that tax based on citizenship:
- United States
- Eritrea
Key implications for US citizens:
-
Worldwide income reporting: US citizens must report all global income to the IRS, including wages, interest, dividends, and rental income.
- Foreign Earned Income Exclusion (FEIE): Allows qualifying individuals to exclude up to a certain amount of foreign-earned income from US taxation.
- Foreign Bank Account Reporting (FBAR): US persons must report foreign financial accounts exceeding $10,000 in aggregate at any time during the calendar year.
- Foreign Account Tax Compliance Act (FATCA): Requires US taxpayers to report specified foreign financial assets if they exceed certain thresholds.
These requirements mean that even if a US citizen lives abroad and pays taxes in their country of residence, they must still file US tax returns and potentially pay additional taxes.
How different tax systems affect US expatriates
For US expats, the citizenship-based taxation system can lead to complexities:
- Double taxation: There's a risk of being taxed by both the US and the country of residence on the same income.
- Foreign tax credits: To mitigate double taxation, the US offers credits for taxes paid to foreign governments.
- Exemptions and exclusions: Provisions like the FEIE and housing exclusions can reduce taxable income.
- Filing complexity: Navigating dual tax systems requires meticulous record-keeping and understanding of both jurisdictions' tax laws.
Understanding these implications is crucial for compliance and financial planning.

Conclusion
Citizenship-based taxation presents unique challenges for US expatriates, from potential double taxation to intricate reporting requirements.|
While mechanisms like the FEIE, foreign tax credits, and tax treaties offer relief, the complexities of navigating dual tax obligations remain.
It's imperative for US citizens living abroad to stay informed and seek professional tax advice to ensure compliance and optimize their tax situation.
FAQ
No, most countries tax based on residency, not citizenship. Only the US and Eritrea tax citizens on worldwide income regardless of residence.
No, some countries, like the United Arab Emirates and Monaco, do not impose personal income taxes.
Living abroad doesn't exempt US citizens from tax obligations. However, provisions like the FEIE and foreign tax credits can reduce or eliminate US tax liability.
No, US citizens are legally required to file tax returns and pay taxes on worldwide income, regardless of where they live.
Yes, US permanent residents (green card holders) are subject to the same tax obligations as US citizens, including taxation on worldwide income.