FEIE or Foreign Tax Credit: Which Works Better in the UK?

The two mechanisms, briefly

The foreign earned income exclusion (FEIE, claimed on Form 2555) lets a qualifying American abroad exclude earned income — salary and self-employment earnings, not investment income — up to an inflation-adjusted cap (see the current IRS figures). Qualifying means passing either the physical presence test or the bona fide residence test. Whatever you exclude simply never enters US taxable income.

The foreign tax credit (FTC, claimed on Form 1116) takes the opposite approach: all income enters the US return, and the UK tax you paid on it offsets the US tax, dollar for dollar within category limits. Pay more UK tax than the US would charge — the normal situation in Britain — and the excess becomes a carryover usable against other years.

Both routes usually get a UK-based employee to the same headline number: zero US tax on salary. The interesting differences are everywhere else.

Why the credit so often fits high-tax Britain

The FEIE was designed with low-tax postings in mind: it shines where local tax is minimal and there is nothing to credit. The UK is the reverse case. On most earnings, UK income tax runs at least as high as the equivalent US tax, which changes the calculation in the credit's favour on several fronts at once:

• Credits scale; the exclusion caps. UK tax rises with your income and keeps covering the US liability all the way up. The FEIE stops at its cap, leaving higher earners to bolt on credits anyway.
• Credits cover more kinds of income. The exclusion touches only earned income; UK tax paid on rent, interest and dividends can only ever be relieved through credits.
• Excess credits bank for later. UK-sized tax bills typically generate more credit than the US needs, and the surplus carries to other years — useful insurance against a year when the mismatch runs the other way.
• Refundable child credit. The refundable additional child tax credit generally requires unexcluded earned income, so families excluding everything under the FEIE can forfeit refunds they would otherwise receive.
• Retirement contributions. Excluded income generally cannot support IRA contributions; income sheltered by credits can.

None of which makes the FEIE obsolete. It remains attractive for people with modest incomes and simple affairs (Form 2555 is far lighter work than Form 1116), for the self-employed in certain configurations, and for anyone whose UK tax is unusually low relative to their US exposure — some part-year cases and treaty-affected situations among them.

Self-employment deserves its own footnote: neither mechanism touches US self-employment tax, which is governed instead by the US–UK totalization agreement. A freelancer paying UK National Insurance generally documents exemption from US self-employment tax with a certificate of coverage — a separate fix that people persistently conflate with the FEIE-versus-FTC choice, and that neither choice makes unnecessary.

The sticky part: revoking the FEIE

Here is the wrinkle that turns an annual comparison into a strategic decision. The FEIE is an election, and once made it stays in effect until revoked. Stopping — switching to credits after years of Form 2555 — counts as revocation, and after revoking you generally cannot claim the exclusion again for a set number of tax years without the IRS's consent. Publication 54 sets out the mechanics and effects.

In other words, the switch is close to a one-way door in the medium term. If you drop the exclusion this year because credits look better, and your circumstances change — a move to a low-tax country, a different income mix — the FEIE may not be waiting for you. That is precisely why the decision should be modelled over a few plausible future years, not just optimised for the current one.

There is no universal answer

It would be convenient to end with a rule. There is not one. The FEIE-versus-FTC choice depends on your income level and mix, your family situation, your self-employment status, your retirement plans, how long you expect to stay in the UK, and where you might live next. Housing adds yet another variable: the exclusion travels with a companion housing provision that helps some renters abroad, while the credit route ignores housing costs entirely — one more term in an equation that differs family by family. Two colleagues on the same London payroll can have different right answers; the same person can have different right answers five years apart — while being partially locked into the earlier choice by the revocation rules.

What can be said generally is this: for settled residents of a high-tax country like the UK, the foreign tax credit deserves to be the starting hypothesis, and the FEIE the alternative that has to argue its way in — with the stickiness of the election weighing on the scales.

This is a calculation we run in both directions as a matter of course, because we prepare the US return and the UK Self Assessment together and can see exactly how much UK tax is available to credit each year. If you are unsure which regime you are in — or suspect you defaulted into the wrong one years ago — a consultation with a couple of past returns to hand will usually settle it quickly.