Form 2555: how the foreign earned income exclusion really works

Figures relate to tax year 2025 (US)

Form 2555 is the expat form for the foreign earned income exclusion. That election removes a large slice of foreign salary from US tax. For 2025, the ceiling is $130,000 per person, per the IRS exclusion rules (opens in a new tab). Qualify, elect it, and that much earned income simply drops off the return.

It sounds like the obvious move for every expat. However, in a high-tax country like the UK, the foreign tax credit often beats it — sometimes by a lot. So this guide covers the tests and the mechanics. Above all, it covers the comparison that should happen before anyone files Form 2555 at all.

Key takeaways

• The 2025 exclusion ceiling is $130,000 of foreign earned income per qualifying person.
• You qualify through one of two tests: physical presence (330 days) or bona fide residence.
• Earned income only — salaries and self-employment. Dividends, interest, pensions and gains never qualify.
• In the UK, the foreign tax credit frequently produces a better overall result.
• Revoking the election later locks you out for five years without IRS permission, so choose carefully.

What is Form 2555?

It is the election form for the foreign earned income exclusion, filed with your 1040 each year. On it you prove your qualifying test, list your foreign earnings, and calculate the excluded amount. The official Form 2555 page (opens in a new tab) carries the form and instructions.

One word matters most in the name: earned. The exclusion covers pay for work — salary, wages, bonuses, self-employment profit. It never touches investment income, pensions, rental profit or capital gains. Those stay fully on the return, whatever the form says about your salary.

How do you qualify for the exclusion?

Two alternative tests exist, and you need only one. Both also require a tax home abroad — your main place of work sitting outside the United States. The right test depends on how settled your life abroad actually is, and the table shows the practical difference:

The details live on the IRS pages for the physical presence test (opens in a new tab) and the bona fide residence test (opens in a new tab). Most settled Americans in Britain qualify under bona fide residence after their first full calendar year.

How much does the exclusion actually save?

Mechanically, Form 2555 removes up to $130,000 of 2025 earnings from taxable income. A housing exclusion can sit on top for renters with high housing costs, computed against IRS base amounts — a meaningful extra in London. Married couples who both work and both qualify each get their own ceiling, so a two-earner household can shelter a substantial combined salary.

But the saving is only real if that tax would otherwise have been paid. And there is the catch for the UK. Most people already pay HMRC more than the IRS would charge on the same salary. The foreign tax credit turns that UK tax into US relief directly — which sets up the real decision.

Exclusion or credit: the choice that decides everything

For UK-based Americans, this is the single most consequential election on the return. In our practice we see the credit win more often than the exclusion. Yet the exclusion gets filed by default, simply because it is famous. The differences are structural:

• Excess foreign tax credits carry forward up to ten years; the exclusion banks nothing for later.
• The credit keeps income 'on' the return, which preserves additional child tax credit refunds for many families.
• The exclusion caps at $130,000; UK tax on higher salaries keeps crediting without limit.
• IRA and Roth contributions need non-excluded earned income — exclude everything and eligibility can vanish.
• The exclusion shines where foreign tax is low; British rates are not that.

None of this makes Form 2555 wrong everywhere. It makes the comparison mandatory, every first year and after every big life change. Run both computations side by side. Look at refunds, carryovers and contribution room, then elect deliberately with the whole picture on the table.

The exclusion is famous. The credit is usually richer. File the comparison, not the reputation.

When does the exclusion clearly win?

In low-tax settings, and the UK has a few of them. Think of a year taxed lightly under the newer arrival rules, a split year, or work performed partly in a low-tax third country. When little foreign tax exists to credit, the exclusion does the heavy lifting alone. That is exactly the situation the form was designed around.

According to the IRS guidance, the two reliefs can also share a return across different income. So a hybrid sometimes wins: exclude the salary, then credit UK tax on the rest. However, the hybrid needs modeling too, because it interacts with every credit and phase-out downstream.

Day counting in real life

The 330-day test is stricter than memory. Only full days outside the United States count. So the flight day in falls out, and so does the flight day back. A two-week US trip thus costs you sixteen days, not fourteen.

The math is hard on short years, and it gets harder in December. Count as you go, not at the end of it all.

So keep evidence as you go. Boarding passes, passport stamps and a simple calendar note beat reconstruction a year later, when memories blur and airlines purge itineraries. For borderline years, the 12-month window can slide — it does not have to match the calendar year, and choosing it well often rescues the test. In practice, that sliding window is the most under-used feature of the whole form.

The revocation trap

Here is the rule that makes the choice sticky. Once you claim the exclusion and later switch to the credit, you have revoked the election. Without IRS consent, you cannot re-elect the exclusion for five tax years. So flip-flopping year by year is off the table.

That is why year one deserves real analysis rather than a default. The right election depends on your salary level, family credits, retirement plans and likely trajectory. Because the lock lasts five years, that decision is worth making once, properly, with the numbers in front of you. An hour of modeling now protects five returns to come.

How to claim it, step by step

When the comparison does favor the exclusion, the claim itself is orderly work. Here is the sequence for a clean Form 2555 filing alongside your 1040:

1. Confirm your tax home sits abroad for the qualifying period.
2. Pick your test: count the 330 days precisely, or document bona fide residence for the full year.
3. Convert your UK earnings to dollars at the yearly average rate.
4. Complete the form's test section, income section and exclusion computation.
5. Add the housing exclusion where rent and eligible costs clear the base amount.
6. Attach the form to your 1040 — one per qualifying spouse.
7. Keep travel records; day counts are the first thing questioned.

A worked example

Take an illustrative example. An engineer in Manchester earns £75,000, all UK-taxed through PAYE. Under Form 2555, her salary sits below the ceiling, so her US tax becomes zero. And that is the whole story — no carryovers, no refundable credits, no contribution room.

Under the credit instead, her US tax is also zero, because UK tax exceeds it. But now the excess credit banks for the future. Also, her child qualifies the family for a refundable credit, and her IRA eligibility survives. Same zero today; meaningfully different position tomorrow.

The mistakes that surface every filing season

Form 2555 errors are rarely arithmetic, because the software handles the sums. Instead, they are elections made on autopilot and day counts made from memory, months after the travel happened. These are the repeat offenders we untangle every filing season:

• Claiming the exclusion by default without ever running the credit comparison.
• Counting travel days to America as days abroad — the 330 must be full days outside the US.
• Excluding self-employment profit and assuming self-employment tax vanished too. It does not.
• Missing that pensions, dividends and rental income never qualified in the first place.
• Revoking by switching to the credit casually, then wanting the exclusion back in year three.
• Forgetting each spouse files their own form with their own test and ceiling.

The self-employment point deserves its own flag: the exclusion removes income tax, never the 15.3% self-employment charge. That fix runs through the totalization certificate instead, covered in self-employment as an American in the UK. And whichever election wins, prepayments follow their own calendar — see US estimated tax payments from the UK.

How US UK Tax Accountants helps

We run the exclusion-versus-credit comparison as standard on every return through our foreign earned income exclusion service. The numbers decide, not the defaults. One senior specialist prepares both sides: the US return, and the UK position feeding it. Fees are fixed and agreed in writing.

Where the exclusion genuinely wins, we file it with the day counts documented. Where the credit wins, you learn why in plain language. You also learn what the five-year rule means for your flexibility.

Make the election on numbers

Is Form 2555 on your return, or about to be? Then the comparison is worth an hour before the election locks anything in. Tell us your income picture. We will model both routes, show the difference, and quote a fixed fee in writing — book a consultation and hear back within one working day.

Last reviewed 8 September 2026 by the US UK Tax Accountants Tax Team. This article is general information, not personal tax advice — speak to a qualified US/UK tax adviser about your own position.

For the neighbouring question, The statutory residence test: how the UK decides you belong to it walks through it in detail.