Your first tax year after leaving the US: dual-status returns, FBAR, and the $10,000 line most people miss
The short version. If you leave the US partway through the year, your final US tax year is usually a “dual-status” year — resident rules for the months you were here, nonresident rules after you go. On top of the return itself, two separate foreign-account disclosures can kick in the moment you open a Japanese bank or brokerage account: FBAR (once your foreign accounts top $10,000 combined, even for one day) and Form 8938. “Sticky” states like California and New York don’t let go automatically. Dual-status returns can’t be e-filed, and the penalties for a missed FBAR start around $16,536 — this is the one year I’d stop trying to DIY.
I’m Jin. I’m a Japanese national who spent four years working in US manufacturing, and I did the money side of moving between the two countries mostly by myself — the hard way. I’m not a licensed tax advisor, and none of this is individualized tax advice. It’s a map of what still applies in the year you leave, so you know which questions to ask. Confirm everything against the official IRS pages and a real preparer.
What “dual-status” actually means
If you’re a US citizen or green-card holder and you change residency status mid-year — resident for part of it, nonresident for the rest — you file a dual-status return. Leaving the country is the classic trigger.
The mechanics that surprise people:
- The December 31 rule sets your main form. If you’re a nonresident on Dec 31, your primary return is Form 1040-NR, with a Form 1040 attached as a “Dual-Status Statement” for the resident part of the year.
- You can’t e-file it. Dual-status returns must be paper-filed, and most consumer tax software either mishandles them or refuses them outright.
- No standard deduction for the nonresident period — itemized only.
- No married-filing-jointly unless both spouses elect to be treated as full-year residents (which pulls both spouses’ worldwide income into the US net — sometimes worth it, sometimes not).
- Worldwide income is taxable for the resident period (Jan 1 → departure date); only US-source income is taxable after that.
Publication 519 is the IRS reference document — thorough, free, and still easy to get wrong on the income split (which dollar of income falls in which period).
One thing that doesn’t apply to most people: the “sailing permit” (Form 1040-C). US citizens are generally exempt. Departing green-card holders are the ones who may need it, and it’s a pre-departure filing that does not replace your annual return.
FBAR and Form 8938: two disclosures, not one
This is where the real cost of ignoring things lives. FBAR and Form 8938 overlap but are not the same filing, and doing one while forgetting the other is a common, expensive mistake.
| FBAR (FinCEN 114) | Form 8938 (FATCA) | |
|---|---|---|
| Triggers when | Foreign accounts exceed $10,000 combined at any point in the year | Higher thresholds (see below) |
| Threshold, single, living abroad | $10,000 aggregate | >$200k on last day, or >$300k anytime |
| Threshold, MFJ, living abroad | $10,000 aggregate | >$400k last day, or >$600k anytime |
| Filed | Separately, via FinCEN’s BSA E-Filing System | Attached to your 1040 / 1040-NR |
| Deadline | April 15, auto-extended to Oct 15 | With your return |
| Covers | Bank, brokerage, mutual-fund, time-deposit accounts abroad | The above plus foreign stock held directly, foreign entity interests, foreign pensions |
Your Japanese megabank account, Japan Post Bank, an SBI Securities brokerage — they all count toward FBAR the day the combined balance crosses $10,000. That’s a low bar: rent deposits, a car purchase, or a single wire can push you over. I’ve seen six-figure transfers for a US car purchase; the same size of flow going to Japan blows past $10,000 in an afternoon.
The cost of missing it: a non-willful FBAR violation runs up to about $16,536; willful can reach $165,353 or 50% of the account balance, whichever is greater, plus potential criminal exposure. (Both figures are CPI-adjusted annually — needs verification against the current FinCEN penalty schedule.) Compare that to what a preparer charges for the whole transition-year package.
“Living abroad” for Form 8938 uses a 330-full-days-in-a-foreign-country test, among other qualifying criteria (needs verification against current Form 8938 instructions). In your departure year you often don’t meet it yet — which means the lower domestic thresholds apply ($50k/$75k single, $100k/$150k MFJ). So the year you leave can actually be the year 8938 is most likely to catch you.
If you’re a US person holding Japanese mutual funds or investment trusts, there’s a separate landmine on top of all this — I wrote about it in /en/blog/pfic-japanese-funds-us-persons/. And if you’re keeping a US brokerage rather than opening a Japanese one, the /en/blog/keep-us-brokerage-when-moving-to-japan/ piece covers why that decision interacts with all of the above.
State tax: the tail that follows you
There is no federal exit tax for ordinary citizens — Form 8854 and the mark-to-market exit tax only hit people renouncing citizenship or abandoning a long-term green card.
States are a different animal. California and New York don’t release you just because you got on a plane.
| State | Safe harbor to break residency | Watch out for |
|---|---|---|
| California | 546 consecutive days abroad under an employment contract; return visits ≤45 days/yr; intangible income ≤$200k/yr (needs verification: confirm current FTB guidance) | Most aggressive; audits reach back years |
| New York | 548-day foreign safe harbor, strict day-counting (needs verification: confirm current NY guidance) | Separate “statutory resident” trap (183+ days + a place of abode) |
Even after you’re a nonresident, both states keep taxing state-source income — rental property, business income. And nearly every income-tax state requires a part-year resident return in your departure year.
Affirmative severance steps matter because domicile is about intent: surrender the state driver’s license, change voter registration, deal with the in-state home, and file that part-year return.
Decision support: what to do in your departure year
- If you left mid-year with only a W-2 and no foreign accounts yet → your return may still be dual-status, but it’s the simplest version. Read Pub 519, and at minimum price out one consult before paper-filing.
- If your combined Japanese accounts touched $10,000 at any point → file the FBAR. Full stop. It’s free to file and the deadline auto-extends to Oct 15.
- If you hold Japanese funds, foreign stock, or a foreign pension → assume Form 8938 is in play at the lower thresholds this year, and check PFIC exposure separately.
- If you’re leaving California or New York → do the severance paperwork before year-end and keep a day-count log. The tail risk here can outlive every other item on this list.
- If two or more of the above are true at once → get a cross-border preparer for this one year. This is the year the pieces interact.
On that last point, from my own experience: my company put me with a cross-border tax accountant, and my whole job was filling out a questionnaire and handing it back. When I researched what it would have taken to do it myself, I was quietly grateful I didn’t have to. If you don’t have a firm handed to you, one place to start is Taxes for Expats, a US–Japan expat firm that supports dual-status returns and FBAR/FATCA — not the only option, but a concrete starting point. (Full disclosure: that’s a referral link — it gives you $25 off your first filing, and I may receive a small credit if you file through it.)
Key deadlines (leaving in 2025 → filing in 2026)
| Filing | Deadline | Extension |
|---|---|---|
| Federal return (1040 / 1040-NR dual-status) | April 15, 2026 | Oct 15 (Form 4868) |
| FBAR (FinCEN 114) | April 15, 2026 | Oct 15 (automatic) |
| Form 8938 | With the return | With the return |
| State part-year return | Usually April 15 | Varies by state |
FAQ
I left the US in June — do I file 1040 or 1040-NR?
If you’re a nonresident on December 31, your primary form is 1040-NR, with a 1040 attached as a Dual-Status Statement for the resident period. You can’t e-file it, so budget time to paper-file. When residency is genuinely ambiguous, confirm your status with a preparer before choosing a form.
Do I still have to file FBAR after I’ve left the US?
Yes, as long as you’re a US person and your foreign accounts crossed $10,000 combined at any point in the year. Your departure year almost always includes months where you were still a US resident, so it’s rarely a clean skip. It’s a free, separate filing through FinCEN’s system, due April 15 with an automatic extension to October 15.
Is a cross-border tax preparer really worth it just for one year?
For the transition year, usually yes. The dual-status income split, the FBAR/8938 overlap, and state-residency severance all interact in this one return, and a single missed FBAR penalty (~$16,536) can dwarf a preparer’s fee. In later, cleaner years abroad you may be able to handle it yourself — but the year you leave is the one I’d pay for.
This is my own research and lived experience, not investment or tax advice. Rules and figures change — confirm everything against the official IRS and state pages and a qualified professional before you act.