The most expensive tax myth in the expat world is also the most comfortable one: “I moved, so the IRS doesn’t apply to me anymore.” The United States taxes its citizens on worldwide income no matter where they live — one of only a handful of countries that does — and the paperwork doesn’t disappear when the plane lands. What actually happens is that a different, specific set of rules takes over. They’re mostly generous rules, for the record. But they have thresholds, deadlines, and penalties that turn a manageable tax season into an expensive mess when you learn them from an IRS letter instead of a blog post. So here are the basics, plainly, with honest caveats about what I am and am not qualified to tell you.
That last part matters, so let’s say it up front: I’m not a tax professional, this post is general education rather than advice for your situation, and expat tax rules change annually. For anything beyond the fundamentals — especially if you’re self-employed, married to a foreign national, or have meaningful assets — a cross-border tax preparer earns their fee. What follows is the orientation layer: the things every American abroad should know exist before they file anything.
Pillar 1: You Still File, Every Year, No Matter Where You Live
The threshold question isn’t where you live — it’s your status. U.S. citizens and resident aliens file on worldwide income, full stop, at the same April deadline (with an automatic filing extension to mid-June for expats, which is not a payment extension — interest runs on anything owed from April). The exclusion people talk about doesn’t exempt you from filing; it’s a form you file. This is the single biggest misconception, so if you remember one paragraph from this post, remember this one.
Pillar 2: The FEIE — Earned Income, Excluded
The Foreign Earned Income Exclusion (FEIE) lets qualifying Americans exclude a set amount of foreign earned income from U.S. tax. The number adjusts yearly: for recent tax years it was $126,500 (2024) and $130,000 (2025) — check the current-year figure, because it indexes. To claim it, you must qualify under one of two tests: the physical presence test (330 full days outside the U.S. in any rolling 12-month period) or the bona fide residence test (a genuinely established residence in a foreign country for an uninterrupted period covering a full tax year). Two fine-print notes people miss: the exclusion covers earned income — wages and self-employment earnings — not investment income, dividends, or capital gains, which are taxed normally. And the two tests are different animals: one is about days, the other about intent and ties.
Pillar 3: The Reporting Layer — FBAR and Form 8938
Separate from whether you owe tax is what you must disclose, and this is where expats get genuinely hurt, because penalties for missing these filings can be severe:
| Filing | Trigger (recent thresholds) | Where it goes |
|---|---|---|
| FBAR (FinCEN Form 114) | Combined foreign accounts exceeded $10,000 at any point in the year | FinCEN, online, separate from your tax return |
| Form 8938 (FATCA) | Specified foreign assets above roughly $200,000 at year-end (single, living abroad) or $400,000 (joint) — see current IRS table | Filed with your Form 1040 |
The FBAR trigger catches nearly everyone who actually moved, because $10,000 across all foreign accounts combined — checking, savings, that local pension with a balance — adds up fast, and the threshold is “exceeded at any moment,” not year-end. The two filings overlap in what they ask for but neither substitutes for the other. Getting both right is a spreadsheet exercise; getting them wrong is a penalty exercise. This is also why I’d never recommend an expat self-file for the first year or two without professional review — the forms are learnable, the trapdoors aren’t visible from inside.
Pillar 4: The Foreign Tax Credit, and the Choice It Forces
Here’s the part that determines whether you pay meaningful U.S. tax at all. If you paid income tax to your country of residence — and in most developed countries, you did — the Foreign Tax Credit generally lets you offset U.S. tax on that same income, dollar for dollar, up to limits. The key rule: you can’t double-dip — income excluded under the FEIE can’t also be credited, so for most employed expats earning under the exclusion limit, the FEIE alone usually wins; income above the exclusion is where the FTC typically applies.
Worked example, clearly illustrative: say you earned $150,000 working abroad in 2025 and claimed the FEIE. The first $130,000 is excluded; the remaining $20,000 stays in the U.S. tax system. If your host country taxed that income too — at 15%, say, that’s about $3,000 — the Foreign Tax Credit is designed so you generally aren’t taxed twice on the same dollars, subject to the actual limitations and ordering rules. The real version of this calculation has more moving parts (deductions, the interaction with your host country’s treaty, state tax issues below), which is precisely why it’s an “understand the concept” example and not DIY instructions.
The Gotchas That Surprise People
- Self-employment tax follows you. The FEIE excludes income from income tax, but U.S. self-employment tax (that 15.3% combination of Social Security and Medicare) generally still applies to self-employment income abroad unless a totalization agreement says otherwise. If you’re freelancing overseas, this is the line item that rearranges your math.
- Your old state may still claim you. A few states are notoriously persistent about chasing former residents. Severing domicile takes deliberate steps — license, voter registration, property ties, time. Don’t assume moving abroad dissolved your state obligation.
- Foreign retirement accounts can be tax weird. Local pensions and their equivalents don’t always map cleanly onto U.S. treatment, and some foreign mutual funds trigger punitive U.S. reporting regimes. This is squarely pro-territory.
- Crypto and brokerage accounts abroad count as foreign accounts. A foreign exchange or custodian with your balance can trip the $10,000 aggregate FBAR threshold. I’ve covered the crypto-specific side in crypto taxes for small investors — the record-keeping discipline is the same whether you’re abroad or not.
- Marriage to a non-citizen changes everything — filing status options, ITIN applications, asset disclosures. Pro territory again.
What I’d Actually Do in Your Position
Not advice — my honest playbook if a friend asked. First, calendar the two dates that matter: the April payment deadline and the June filing deadline, and treat them as real. Second, inventory your foreign accounts once a year with balances and account numbers, because both FBAR and 8938 want details, not vibes. Third, decide early whether you’re FEIE-eligible (days and ties) or better served by the credit route, and don’t flip-flop between years without understanding the consequences of revoking and re-electing. Fourth, budget for one professional cross-border review in your first full year abroad even if you self-file afterward — treat it as tuition. And fifth, if the reason you’re reading this post is that you’re still in the planning stage, the filing obligations belong in the checklist alongside visas and schools: my family-move checklist has the tax line in the right slot, and the moving-abroad checklist for families is the companion piece to this one.
None of this is a reason not to go. The system is navigable, the exclusion is generous, and for plenty of Americans abroad the honest outcome is a boring return with a zero balance due. Boring is the goal in tax. The people who get hurt are the ones who spent five years not filing, discovered the penalty schedule, and then needed a specialist to perform surgery on their history. File, disclose, keep records — and let the system be uneventful at you.
Forward step: if you’re planning a move, put “first-year expat tax review” on the calendar twelve months from your arrival date, tonight. If you’re already abroad and unfiled, the fix is a specific program for late filers — a pro can usually clean it up without catastrophe, and the sooner it starts the cheaper it gets. And when you’re weighing whether this whole project makes sense at all, my honest take is in should you consider leaving the US, and the practical sequence lives in the 7-step plan to moving abroad.
