Worldwide Income: Why the IRS Cares What You Earn Outside the US
A lot of people are surprised to learn that the United States taxes its citizens and green card holders on their worldwide income, no matter where they live or where the money was earned. Most countries don’t work this way — they tax based on residency, so if you move away and stop being a resident, they generally stop taxing you. The US is one of the few countries that taxes based on citizenship, which means an American living and working in Singapore, Dubai, or anywhere else still has a US filing obligation on their full income, not just what they earn domestically.
This catches a lot of people off guard, especially first-generation immigrants who assumed that once they left a country, that country was done taxing them, the same way it would work back home. It’s a different system here, and it applies regardless of how long you’ve been gone or whether you ever plan to return.
The Tools That Prevent Double Taxation
The good news is the tax code gives you real tools to avoid being taxed twice on the same income.
Foreign Earned Income Exclusion (FEIE) lets you exclude a set amount of foreign earned income each year:
- 2025: $130,000
- 2026: $132,900
To qualify, you need to meet either the bona fide residence test or the physical presence test (330 full days outside the US in a 12-month period). You claim this on Form 2555.
Foreign Tax Credit, claimed on Form 1116, often works out better than the exclusion if your foreign income is taxed at a rate higher than what the US would charge. It gives you dollar-for-dollar credit for foreign taxes paid, rather than just excluding income from the calculation.
Some people qualify for and use both — applying the exclusion first and the credit on income above that threshold.
Tax Treaties Add Another Layer
The US has treaties with a long list of countries that can:
- Adjust how certain income types get taxed
- Prevent double taxation on specific categories like pensions or social security
- Provide tie-breaker rules when someone could be considered a tax resident of two countries at once
Don’t Forget the Reporting Side
None of this replaces the reporting side either. If you have foreign bank or investment accounts above certain thresholds, you likely have separate FBAR and FATCA filing obligations on top of your income tax return.
Bottom Line
Worldwide income taxation, the credits and exclusions that offset it, and the account reporting requirements are really three separate conversations that all need attention if you’ve got financial ties outside the US.
Disclaimer: This article is for general informational purposes only and is not tax or legal advice. Consult a CPA for guidance specific to your situation.
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