The American abroad: why moving never ends your US tax life

The fact every other country's movers don't face. The United States taxes its citizens and green-card holders on worldwide income no matter where they live. A Brit who leaves Britain stops filing British returns; an American who leaves America files Form 1040 for life. Moving abroad doesn't end your US tax life — it doubles it: a new country's system on top of the one you can't leave. Every planning question for this corridor is therefore really one question: how do the two systems interlock without taxing you twice — and which US traps get worse the moment you cross the border?

Who this Guide is for. US citizens and permanent residents moving abroad — employees, founders, retirees, accidental Americans discovering their status — and the accountants receiving them. The corridor splits sharply by destination: a zero-tax landing (UAE, Gulf, some territorial regimes) and a high-tax landing (most of Europe) produce nearly opposite optimal setups, and this Guide keeps both threads visible throughout.

Part 2 — The reporting web: forms that carry four-figure penalties

For Americans abroad the income tax is often modest; the information reporting is where lives get ruined. None of these forms raise a dollar of tax by themselves; each carries penalties that start around $10,000.

Form	Trigger	The point
FBAR (FinCEN 114)	Aggregate of all non-US financial accounts exceeds $10,000 at any moment in the year	Every account, even ones you only have signature authority over. Filed with FinCEN, not the IRS. Willful violations are catastrophic.
Form 8938 (FATCA)	Foreign financial assets above thresholds — for genuine expats, $200k/$300k single, $400k/$600k joint (year-end/any-time)	Overlaps FBAR but is not a substitute; both file.
Form 5471	Officer/director/≥10% shareholder of a foreign corporation	The founder trap — see Part 3.
Form 8621	Any interest in a PFIC	The investment trap — see Part 3.
Form 3520/3520-A	Foreign trusts, and foreign gifts/inheritances above ~$100k	Receiving a large gift from a non-US parent is reportable, tax-free or not.
FinCEN/8858, 8865	Foreign disregarded entities and partnerships	Your foreign LLC-equivalent is not invisible.

The banking reality: FATCA also makes you radioactive to some non-US banks and brokers — expect account refusals, and expect your local bank to report you to the IRS. Keep meticulous records; the data now flows both ways.

Part 4 — Self-employment, Social Security and totalization

• US self-employment tax (15.3% up to the wage base, Medicare above) follows citizens abroad and is not reduced by the FEIE.
• Totalization agreements (~30 countries: most of Europe, UK, Japan, Australia…) assign you to one social system and let a certificate of coverage switch off US SE tax while you pay the local system — and let credits in both systems combine for benefit eligibility.
• No totalization with the UAE or most of the Gulf: a self-employed American in Dubai owes full US SE tax on worldwide net earnings, FEIE or not. This one line reshapes the employee-vs-freelancer decision for Gulf-bound Americans.
• US Social Security benefits remain payable abroad (unlike some countries' frozen pensions), and years abroad without covered earnings simply add zeros to your 35-year average.

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Part 5 — The states that won't let go

Federal expatriation is only half the departure; your state may not recognise it.

• Sticky states — California, Virginia, South Carolina, New Mexico are the notorious examples — presume continuing residency while you keep ties: driver's licence, voter registration, property, spouse, even bank branches. California's FTB litigates this aggressively; "I moved to Singapore" is the beginning of the argument, not the end.
• The pattern that works: sever affirmatively (licence surrendered/exchanged, voter roll moved to federal-only ballots, homes sold or demonstrably rented out arm's-length, registrations closed), ideally establishing a domicile pit-stop in a no-income-tax state (Florida, Texas, Washington, Nevada, South Dakota) before departure when the facts allow it.
• Expect a part-year state return in the departure year and keep the evidence file for four more.

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Part 6 — Retirement accounts, pensions and the treaty patchwork

• Keep the 401(k)/IRA — moving abroad doesn't disturb their US deferral, and most treaties respect pension wrappers. Early liquidation "because I'm leaving" is almost always the worst move on the board.
• Contributions get harder: IRA contributions require non-excluded earned income (FEIE can zero out your eligibility — one more vote for FTC in high-tax countries).
• Foreign pensions (a UK SIPP, German bAV, Swiss Pillar 2/3) are, absent treaty language, just foreign accounts to the US: employer contributions and growth can be currently taxable, and some wrappers flirt with trust or PFIC treatment. The UK treaty is famously decent here; many others are silent. Get the destination-specific answer before funding anything local.
• Roth conversions in low-income expat years (FEIE-excluded salary, little US-taxable income) are one of the corridor's best quiet plays — filling the 10–12% brackets annually.

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Part 7 — The exit door: renunciation and the §877A exit tax

For some — long-term expats, accidental Americans — the endgame is renouncing citizenship (or abandoning a long-held green card, which triggers the same regime after 8 of 15 years). The sequence matters more than anywhere else in this Guide:

1. Five years of clean compliance first. Certifying five years of full US tax compliance (Form 8854) is a precondition for a non-covered exit; renouncing while non-compliant makes you a covered expatriate automatically.
2. Covered expatriate tests — any one of: net worth ≥ $2 million; average net US tax liability over the prior five years above an inflation-adjusted threshold (~$200k region — check the current figure); or failure of the compliance certification.
3. The mark-to-market exit tax: covered expatriates are deemed to sell everything the day before expatriation, with a gain exclusion around $890k (inflation-adjusted; check the year's figure), plus punitive treatment of deferred accounts and — the sleeper — §2801: US persons who later receive gifts or bequests from a covered expatriate pay a transfer tax at the top rate. Renouncing "covered" taints your heirs, not just you.
4. The mechanics: appointment at a consulate, the $2,350 fee, the CLN, and a final dual-status return with 8854.

Planning corollary: for anyone within sight of the $2m line, the order is plan → gift → comply → renounce, over multiple years — pre-expatriation gifting (using the still-unified lifetime exemption) is the lever that de-covers borderline cases.

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Part 8 — Sequenced checklist

Before the move

1. Pick your shield strategy by destination: FEIE (zero-tax landing) vs FTC (high-tax landing); don't burn the FEIE election casually.
2. Founders: freeze all entity formation until Part 3.2 has been advised on. Employees: confirm whether a totalization agreement covers you.
3. Sever the sticky state affirmatively; consider the no-tax-state pit stop.
4. Move investments to a US brokerage that accepts expats; purge foreign funds before they become long-held PFICs.

Each year abroad 5. File the 1040 (June 15 automatic, October 15 by extension), FBAR, 8938, and whatever the entity/trust web requires. Calendar them — the penalties are for silence, not for owing. 6. Track presence days if using the Physical Presence Test; keep the bona-fide-residence evidence file otherwise. 7. Harvest the low-bracket years: Roth conversions, gain realisation up to the bracket edges.

If the end state is renunciation 8. Five clean years → net-worth management → appointment → 8854. Treat it as a multi-year project with its own adviser.

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The trap list

Trap	Why it bites
"I don't owe anything so I don't file"	The penalty regime attaches to the forms, not the tax. FBAR + 8938 + 5471 silence is how five-figure penalties happen on zero-tax lives.
Buying the local index fund	PFIC — punitive rates, interest charges, one 8621 per fund.
Forming the Dubai FZ-LLC like everyone else	CFC/GILTI: the 0% local rate becomes current US tax + Form 5471.
High earner relying on FEIE in the Gulf	Everything above ~$130k is fully US-taxed; there's no FTC to help.
Freelancing in a non-totalization country	15.3% SE tax survives the FEIE untouched.
Leaving California casually	FTB residency audits reach years back; ties you forgot are ties they'll find.
Cashing out the 401(k) on departure	Tax + 10% penalty for a problem that didn't exist.
Renouncing while non-compliant or above $2m unplanned	Covered-expatriate status: mark-to-market tax now, §2801 tax on your heirs later.
Marrying/joint accounts abroad without advice	Non-resident spouse elections (§6013(g)), gift-splitting limits and FBAR scope all shift.

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Sources (primary, verify current-year figures)

IRC §911 and Form 2555 instructions (FEIE, housing exclusion — irs.gov); Form 1116 instructions (FTC); FinCEN Report 114 + BSA e-filing guidance (FBAR); Form 8938 instructions (FATCA thresholds); Forms 5471 / 8621 / 3520 instructions; §951A (GILTI) and §962 election guidance; IRS Publication 54 (Tax Guide for U.S. Citizens Abroad); SSA totalization agreement list (ssa.gov/international); §877A / Form 8854 instructions and §2801 regulations; state residency: California FTB Publication 1031 and equivalents.

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Built for the OpenAccountants migration desk. Americans are the one nationality whose cross-border tax problem never ends — which also makes them the clients who need a named, credentialed accountant on both ends of every move, permanently. Every figure above inflation-adjusts annually: treat numbers as pointers to their primary sources.