Choosing between the Foreign Earned Income Exclusion (FEIE) and the Foreign Tax Credit (FTC) is the single most important annual tax decision for most US expats in the UK. Get it wrong and you could face thousands of dollars in unnecessary US tax, lose IRA contribution eligibility, or end up with missed carry-forward credits. Get it right, and you may owe zero US tax.
This guide compares the two strategies head-to-head for 2026, with specific analysis for US expats living and working in the United Kingdom.
Quick Summary: FEIE vs FTC for UK Expats
For most US expats in the UK, the Foreign Tax Credit is the better choice — but the right answer depends on your specific income profile. Here’s the short version:
- FTC wins if: your UK tax rate equals or exceeds your US effective rate; you have investment income; you want to contribute to a Roth IRA; you want carry-forward credits
- FEIE wins if: you are in a low-UK-tax situation; your income is exactly at the exclusion limit; you are in a jurisdiction with no income tax; or you have minimal investment income
- Combination may work: FEIE for earned income above FTC coverage, FTC for income types the FEIE cannot cover
What Each Strategy Does
The Foreign Earned Income Exclusion (FEIE)
The FEIE — claimed on Form 2555 — excludes up to $130,000 of foreign-earned income (2025 tax year) from your US taxable income. The key word is exclude: the income is removed from your US tax base entirely, as if it were never earned.
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- Works by reducing your taxable income
- Applies only to earned income (wages, self-employment) — not investment income
- Has a hard dollar cap ($130,000 in 2025)
- Cannot create a negative tax liability or refund
- Requires meeting the Bona Fide Residence or Physical Presence Test
The Foreign Tax Credit (FTC)
The FTC — claimed on Form 1116 — offsets your US tax liability dollar-for-dollar with income taxes actually paid to the UK. It works as a credit against tax, not a reduction of income.
- Works by reducing your tax owed, not your taxable income
- Applies to all income types on which UK tax is paid (earned, investment, capital gains)
- Has no hard cap — but is limited by the US tax attributable to foreign income
- Excess credits can be carried back 1 year and forward 10 years
- Preserves taxable compensation for IRA contributions
Head-to-Head Comparison: 10 Key Factors
1. Coverage of Investment Income
FEIE: ❌ Cannot exclude investment income. UK dividends, interest, and capital gains are fully US-taxable even if you claim the FEIE.
FTC: ✅ Can credit UK taxes on investment income (subject to the passive basket limitation). If you hold UK shares or funds and pay UK tax on the income, the FTC can offset the US liability.
2. IRA Contribution Eligibility
FEIE: ❌ Kills IRA contributions. IRA contributions require US taxable compensation. If FEIE removes all your earned income from US taxation, you have no taxable compensation and cannot contribute to a Traditional or Roth IRA for that year. Over a 10–20 year expat career, this can mean hundreds of thousands of dollars in lost tax-advantaged retirement savings.
FTC: ✅ Preserves IRA eligibility. Under the FTC, your income remains in the US tax base. Even if your net US tax is zero after the credit, you still have taxable compensation supporting IRA contributions up to the annual limit ($7,000 / $8,000 if 50+ for 2025).
3. The Stacking Rule (FEIE’s Hidden Tax Cost)
FEIE: ❌ The stacking rule increases your effective rate on non-excluded income. When you use the FEIE, the excluded income is “stacked” below your remaining income on the US rate schedule. Your remaining income is taxed at the rates that would apply if the excluded income had been included. This can push investment income or above-the-cap earnings into higher brackets.
FTC: ✅ No stacking effect. All income is taxed at its natural bracket, with the FTC reducing the tax owed.
4. Income Above the Exclusion Cap
FEIE: ❌ Hard cap at $130,000. If you earn £150,000 (~$190,000), the FEIE only excludes $130,000. The excess $60,000 is US-taxable. And due to the stacking rule, it’s taxed at high marginal rates. The FEIE provides no benefit on income above the cap.
FTC: ✅ No cap. UK taxes on any amount of income can be credited against the corresponding US tax liability, subject to the FTC limitation ratio.
5. Self-Employment Tax
FEIE: ⚠️ Does NOT eliminate SE tax. self-employed US expats who use the FEIE still owe 15.3% US self-employment tax (unless the Totalization Agreement applies).
FTC: ⚠️ Also does NOT eliminate SE tax. UK NICs are not income taxes, so they cannot be credited against US SE tax. Both strategies leave you with potential SE tax exposure — the solution is the US-UK Totalization Agreement, not the FEIE or FTC.
6. Carry-Forward Credits
FEIE: ❌ Creates no carry-forwards. The exclusion simply removes income — any “excess” is lost.
FTC: ✅ Unused credits carry forward 10 years. If your UK taxes exceed the FTC limitation in a given year (e.g., a year with high UK tax and low US tax on foreign income), the excess carries forward to offset future US tax on UK income — including future capital gains.
7. Simplicity
FEIE: ✅ Simpler in some respects. Form 2555 is more straightforward than Form 1116 with its complex limitation calculations and basket segregation.
FTC: ⚠️ More complex. Form 1116 requires calculating the FTC limitation for each income basket, tracking carry-forwards, and handling accrual vs. cash method elections. However, this complexity is worth the benefit for most UK expats.
8. Switching Between Elections
FEIE: ⚠️ Revocation has a 5-year lock-out. If you make the FEIE election and later revoke it, you cannot re-elect the FEIE for 5 years without IRS consent. Switching from FEIE to FTC is a significant, difficult-to-reverse decision.
FTC: ✅ More flexible. You can make the FTC election annually. There is no comparable 5-year restriction on changing your approach (though you should model the long-term impact before switching from FEIE to FTC).
9. UK pension and Retirement Planning
FEIE: ❌ No benefit for pension income. The FEIE only covers active earned income. UK pension distributions, whether from a SIPP, personal pension, or defined benefit scheme, cannot be excluded via the FEIE.
FTC: ✅ Can credit UK tax on pension income (subject to treaty analysis). For expats planning retirement in the UK, the FTC framework integrates better with pension distribution planning than the FEIE.
10. Net Investment Income Tax (NIIT)
FEIE: ❌ Does not reduce NIIT exposure. The FEIE does not reduce modified AGI for Net Investment Income Tax (3.8%) purposes — meaning NIIT may apply even if income tax is zero.
FTC: ✅ Better interaction with NIIT. Certain UK taxes on investment income can be credited against NIIT (subject to regulatory restrictions), providing better overall NIIT management.
Example: £120,000 UK Salary — FEIE vs FTC Compared
Assume a US citizen working in London earning £120,000 salary (~$152,000) and paying ~£38,000 (~$48,000) in UK income tax.
Under FEIE:
- Exclude $130,000 from US income
- Remaining US-taxable income: ~$22,000 (subject to stacking — taxed at higher rate)
- US tax on remaining income: ~$6,000–$8,000
- No credit for UK taxes paid
- No IRA contribution allowed
- Result: ~$6,000–$8,000 US tax owed
Under FTC:
- US gross income: $152,000
- US tax calculated on $152,000 (at joint/single rates): ~$30,000
- FTC available: ~$48,000 (UK taxes paid)
- FTC limitation (roughly $30,000 × 100% foreign income): ~$30,000
- Net US tax after FTC: $0
- Excess FTC of ~$18,000 carries forward 10 years
- IRA contribution allowed: ✅ ($7,000 Roth IRA contribution preserved)
- Result: $0 US tax, $18,000 carry-forward credits, full IRA eligibility
In this example, the FTC saves $6,000–$8,000 in immediate US tax and preserves IRA eligibility and carry-forward credits.
When Might FEIE Be Better?
The FEIE can be superior in specific situations:
- Living in a low-tax or zero-tax country (not the UK — UK taxes are typically sufficient to cover US liability via FTC)
- Short-term assignment with low investment income where simplicity is valued
- Income below the exclusion cap with no investment income and no desire to contribute to IRAs
- Already elected FEIE in prior years and the cost of revocation analysis outweighs the benefit of switching
The Combination Strategy
Some expats use both: FEIE for earned income and FTC for investment income on which FEIE cannot be applied. However, you cannot apply FTC to income that has been excluded by the FEIE. The optimal combination requires careful modelling and professional preparation.
Get Expert FEIE vs FTC Analysis
Every expat’s situation is different. The right strategy depends on your income level, UK tax position, investment portfolio, pension plans, IRA goals, and future plans. Our US-UK tax specialists can model both approaches for your specific facts and help you make the optimal election each year.
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