Double Taxation for U.S. Expats Explained: Why It Happens and How to Avoid It
Double taxation happens when both the U.S. and your host country tax you on the same income. The U.S. is one of only two countries (along with Eritrea) that taxes based on citizenship rather than residence, which means Americans abroad owe U.S. taxes on worldwide income even while paying local taxes where they live. In practice, most expats eliminate double taxation entirely by using the Foreign Earned Income Exclusion (up to $130,000 for 2025), the Foreign Tax Credit (a dollar-for-dollar credit for foreign taxes paid), or a combination of both.
According to the IRS, U.S. citizens and resident aliens must report worldwide income regardless of where they live. However, the tax code provides powerful protections specifically designed to prevent double taxation. The FEIE works best in low-tax countries by excluding income from U.S. tax entirely, while the FTC works best in high-tax countries by crediting foreign taxes paid against your U.S. liability. Tax treaties with over 60 countries provide additional relief on specific income types, such as pensions, dividends, and interest. For a side-by-side comparison of the two main strategies, see our FEIE vs. FTC guide.
Here’s why double taxation occurs, who’s at risk, and the specific steps to reduce your combined tax bill to the legal minimum.
Concerned about paying taxes in two countries?
What Is Double Taxation?
Double taxation happens when you’re taxed on the same income by two different countries. For U.S. expats, this typically means paying income tax to both your country of residence and the United States.
The U.S. is one of only three countries in the world that taxes based on citizenship rather than residence. This means even if you live and work abroad, you’re still required to file a U.S. tax return and report your worldwide income to the IRS.
Is this fair? That’s debatable. While groups like Americans Against Double Taxation are working to change these laws, double taxation remains legal under the current U.S. tax code. But here’s what matters most: you have legitimate, IRS-approved ways to protect yourself from paying twice.
Who’s Affected by Double Taxation?
U.S. Citizens Living Abroad
If you’re an American working in another country with income tax, you’re technically subject to taxation by both governments. This includes:
- Corporate expats relocated by their companies
- Self-employed professionals and freelancers
- Digital nomads working remotely from foreign countries
- Retirees living abroad
- Business owners with foreign operations
Accidental Americans
Even if you’ve never lived in the U.S., if you were born to at least one U.S. citizen parent living abroad, you may be a U.S. citizen with filing obligations. This can come as a shock if you’ve never filed U.S. taxes before.
C-Corporation Shareholders
Shareholders in C corporations face a different form of double taxation. The corporation pays taxes on profits at the corporate level, then shareholders pay personal income tax on dividends they receive from those already-taxed profits.
How Do I Avoid Paying Taxes Twice?
Foreign Earned Income Exclusion (FEIE)
The FEIE allows you to exclude a significant portion of your foreign-earned income from U.S. taxation. For tax year 2025 (filed in 2026), you can exclude up to $130,000. If you’re married and both spouses qualify, you can each claim the exclusion for a combined total of $260,000.
What qualifies as earned income:
- Salaries and wages
- Bonuses and commissions
- Self-employment income
- Tips
What doesn’t qualify:
- Interest and dividends
- Capital gains
- Rental income
- Pension payments
- Social Security benefits
To qualify for FEIE, you must meet one of two tests:
- Physical Presence Test: Spend at least 330 full days in foreign countries during any 12-month period
- Bona Fide Residence Test: Establish genuine residence in a foreign country for a full tax year
Example: Emily in Thailand
Emily moved to Bangkok and works as a freelance web developer, earning $85,000 per year. She qualifies for FEIE under the Physical Presence Test by spending 340 days abroad.
- Foreign earned income: $85,000
- FEIE exclusion: $85,000
- US taxable income: $0
- U.S. tax owed: $0
Foreign Tax Credit (FTC)
The Foreign Tax Credit gives you a dollar-for-dollar credit against your U.S. tax liability for foreign income taxes you’ve paid. Unlike FEIE, the FTC applies to both earned and passive income, making it incredibly versatile.
When FTC works best:
- You live in a high-tax country
- You have passive income (dividends, interest, rental income)
- Your foreign tax rate exceeds the U.S. rate
Key advantage: If your foreign tax credit exceeds your U.S. tax liability in a given year, you can carry the excess backward one year or forward up to ten years.
Example: Marcus in Germany
Marcus works in Berlin earning $120,000 per year. Germany’s tax rate is higher than the U.S. rate.
- U.S. income: $120,000
- German taxes paid: $35,000
- US tax before credits: $30,000
- Foreign Tax Credit applied: $30,000
- US tax owed: $0
- Remaining credit to carry forward: $5,000
Can I Use Both FEIE and Foreign Tax Credit?
Yes, but strategically. You can’t use both on the same dollar of income, but many expats combine them effectively on different income types:
If you earn $150,000 in a high-tax country, you might exclude $130,000 with FEIE and use the Foreign Tax Credit on the remaining $20,000 to eliminate any U.S. tax liability altogether.
What About Tax Treaties?
The U.S. has income tax treaties with over 70 countries designed to prevent double taxation. These treaties can provide additional benefits like:
- Reduced withholding rates on dividends and interest
- Exemptions for certain types of income
- Clarification on which country has primary taxing rights
Nearly all U.S. tax treaties include a “saving clause” that allows the U.S. to tax its own citizens as if the treaty didn’t exist. This means treaties alone won’t prevent double taxation for U.S. citizens, though they can provide helpful supplemental benefits.
Will I Pay Twice in My Situation?
Low-Tax Country Situation
Rachel in Costa Rica (teacher, $55,000 salary)
- Costa Rica tax rate: approximately 10%
- Uses FEIE to exclude the entire $55,000
- Result: $0 U.S. tax owed
High-Tax Country Situation
David in France (corporate employee, $95,000 salary)
- France tax rate: approximately 30%
- French taxes paid: $28,500
- Uses Foreign Tax Credit for the entire liability
- Result: $0 U.S. tax owed
Mixed Income Situation
Jennifer in Spain (real estate investor + remote work)
- W-2 income: $80,000 (uses FEIE)
- Rental income: $30,000 (uses Foreign Tax Credit)
- Result: Minimal or $0 U.S. tax owed after combining both protections
What Mistakes Should I Avoid?
- Not filing at all: Even if you owe nothing, you must file your U.S. tax return to claim these protections. No filing means no FEIE or FTC.
- Missing Form 2555: FEIE isn’t automatic. You must file Form 2555 with your tax return to claim it.
- Revoking FEIE without understanding consequences: If you revoke the Foreign Earned Income Exclusion, you generally can’t claim it again for five years without IRS permission.
- Ignoring state taxes: Some states may still require you to file even if you live abroad. Consider formally establishing residence in a no-income-tax state before moving overseas.
- Forgetting FBAR requirements: If your foreign financial accounts exceeded $10,000 at any time, you must file an FBAR by April 15 (automatic extension to October 15).
What If I’m Behind on Filing?
If you haven’t been filing, you’re not alone, and it’s not too late. The IRS offers Streamlined Filing Compliance Procedures specifically designed for expats who weren’t aware of their filing obligations. This program allows you to:
- File the last three years of tax returns
- Submit six years of FBAR reports
- Claim FEIE and Foreign Tax Credit retroactively
- Avoid most penalties if your failure to file wasn’t willful
The key is to come forward before the IRS contacts you. If you file proactively through the streamlined procedures, you can generally catch up with minimal penalties.
What Should I Do Next?
- If you’re current on filing: Continue claiming FEIE or Foreign Tax Credit annually. Consider whether switching strategies might benefit you as your income or country of residence changes.
- If you’re behind on filing: Contact an expat tax specialist immediately to discuss streamlined procedures. The sooner you catch up, the better your outcome.
- If you’re planning to move abroad: Work with a tax professional before you leave to establish state tax residency, understand your future filing obligations, and plan your approach to FEIE vs. FTC.
- If you’re returning to the U.S.: Plan your final year abroad filing carefully to maximize your final FEIE claim and understand how repatriation affects your tax situation.
You’re Not Going to Pay Twice
Between the Foreign Earned Income Exclusion, Foreign Tax Credit, and strategic planning, it’s very rare that an American living abroad pays significant double taxation. With over 15 years of experience helping Americans abroad, we’ve seen these protections work effectively for expats in 190+ countries.
If you’re ready to be matched with a Greenback accountant, click the get started button below. For general questions on expat taxes or working with Greenback, contact our Customer Champions.
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This article is for informational purposes only and does not constitute tax, legal, or financial advice. Tax laws change frequently, and individual circumstances vary. Always consult with a qualified tax professional about your specific situation.
