US Citizens Abroad: Why Moving Doesn't Stop the IRS (and What Actually Does)

A consultant sells her apartment in Chicago, moves to Lisbon, registers as a Portuguese tax resident and assumes she has left the US tax system behind. Two years later a letter arrives about unfiled returns and unreported bank accounts. She did not do anything dishonest. She simply believed something that is true for citizens of almost every country on earth, except hers.

Citizenship-based taxation: the rule almost nobody expects

Nearly every country taxes people based on where they live. Leave, become a tax resident somewhere else, and your obligations at home largely end. The United States works differently: it taxes its citizens (and green card holders) on their worldwide income for as long as they hold that status, no matter where they live or earn.

That means a US citizen running an agency from Dubai, drawing dividends in Singapore or selling stock from a beach in Mexico still owes a federal tax return every year, still reports every foreign account, and still calculates US tax on all of it. Moving changes which country taxes you first. It does not change whether Washington taxes you at all.

The system does provide relief tools so that expats are not fully double taxed. But each tool has sharp edges, and misunderstanding them is where most expensive mistakes happen.

What the FEIE actually covers (and what it quietly does not)

The Foreign Earned Income Exclusion (FEIE) lets qualifying Americans exclude up to $132,900 of foreign earned income for tax year 2026 (the amount adjusts annually for inflation). You qualify through one of two tests:

• Physical presence test: 330 full days outside the US in any 12-month period.
• Bona fide residence test: genuine residence in a foreign country for an uninterrupted period that includes a full tax year.

You claim it on Form 2555, and a married couple where both spouses qualify can each take their own exclusion. So far, so good. Here is what the FEIE does not do:

• It only covers earned income: salary, wages, self-employment income for work performed abroad.
• It does not cover dividends, interest, capital gains, rental income, pensions or crypto gains. If your wealth comes from investments or a business you own but do not actively work in, the FEIE barely touches your bill.
• It does not remove self-employment tax. Freelancers still owe 15.3% Social Security and Medicare on net earnings unless a totalization agreement applies.
• Income above the cap is taxed at the rates that would apply as if the exclusion did not exist (the stacking rule), so the marginal rate on the excess is higher than people expect.

The foreign tax credit: the other tool

The Foreign Tax Credit (FTC, Form 1116) takes a different approach: instead of excluding income, it gives you a dollar-for-dollar credit for income tax you already paid to another country. If you live in a high-tax country such as Germany or Spain, the FTC usually wipes out your US liability entirely and even banks excess credits for future years. If you live in a zero-tax country, the FTC gives you nothing, because you paid nothing to credit.

FBAR and FATCA: the reporting layer with the ugliest penalties

Separate from tax, there is disclosure. Two regimes matter:

FBAR (FinCEN Form 114)

If the combined value of your non-US financial accounts exceeds $10,000 at any moment during the year, you file an FBAR. The threshold is aggregate: three small accounts that briefly add up past $10,000 trigger it. Penalties for non-willful failures run to five figures per year; willful failures are dramatically worse.

FATCA (Form 8938)

Attached to your tax return, Form 8938 reports specified foreign financial assets. For a single filer living abroad the threshold is $200,000 at year end or $300,000 at any point in the year ($50,000 year end if you live in the US); thresholds double for joint filers. And because foreign banks report American clients to the IRS under FATCA, "they will never know" is not a strategy. They already know.

The three realistic strategies

1. Optimize within the system (FEIE + FTC + structure)

For most working Americans abroad this is the right answer: combine the FEIE or FTC intelligently, time your move to qualify cleanly, manage self-employment tax through the right entity or a totalization country, and keep the reporting spotless. A well-run setup often brings the effective US rate on earned income to zero or near zero, while you keep the passport. Its limit is structural: it does little for large investment income or a major liquidity event.

2. Puerto Rico Act 60

Puerto Rico is the one place where a US citizen can legally escape federal tax on certain income without renouncing, because bona fide residents of Puerto Rico are taxed under the island's own regime. Under Act 60, qualifying new residents have paid 0% on Puerto Rico source capital gains, dividends and interest. Note the calendar: applications submitted by December 31, 2026 lock in the 0% rate, while later applicants fall under a new 4% rate on that passive income and stricter eligibility rules. It requires genuinely moving your life to the island (at least 183 days a year there and a closer connection to Puerto Rico), which is exactly why it works.

3. Renunciation: the only complete exit

Giving up US citizenship is the only way to fully leave citizenship-based taxation. Done well, with a second passport secured first and the exit tax planned around, it is a clean, legal, permanent solution chosen by thousands of Americans every year. Done badly, it can trigger a mark-to-market tax on your entire net worth. The mechanics, the covered expatriate tests and the real math deserve their own analysis: see our guide to renouncing US citizenship and the exit tax.

Which one is yours?

The honest answer depends on three variables: how your income is generated (earned vs passive), the size of a future liquidity event, and how much the passport itself matters to your life and business. A freelancer earning $150,000 has a very different optimal path than a founder expecting an eight-figure exit. The mistake is not choosing a strategy; it is drifting for years without one while penalties and lost savings compound.

Frequently asked questions

This content is informational and educational. It is not legal or tax advice. Verify current law and consult a specialist about your case before making decisions.