401(k) and IRA after moving to Japan: leave it, roll it, or cash out?

The short version. Your US 401(k) and IRA are exempt from FBAR and FATCA reporting as long as they stay with a US custodian, so nothing forces you to touch them when you leave. For most people the winning move is to do a direct rollover of an old employer 401(k) into a Traditional IRA (zero tax, zero withholding) or simply leave it where it is. Cashing out before age 59½ is the expensive panic move: a 10% penalty plus ordinary income tax can eat 32–47% of the balance. The real work isn’t the money — it’s keeping online access, your beneficiary, and your 2FA phone number alive after you’re gone.

I’m a Japanese national who spent four years working in US manufacturing, and I contributed to a 401(k) with an employer match. When I researched what happens to it after I go home, the honest answer was: less has to happen than people fear — but the things that do matter are the ones nobody mentions. This is my own research and lived experience, not investment or tax advice. Confirm everything against official IRS pages and a professional before you act.

First: nothing forces you to act

The panic usually comes from a wrong assumption — that moving abroad means you have to liquidate or report your retirement accounts. You don’t.

• US-based 401(k) plans and IRAs are exempt from FBAR (FinCEN 114) reporting.
• They’re also exempt from FATCA Form 8938 reporting.
• Those thresholds ($10,000 for FBAR, roughly $200,000 for FATCA single-filer abroad — needs verification on current limits) apply to foreign accounts — not to a US-custodied 401(k) or IRA.

So the account staying in the US is the simplest outcome from a filing standpoint. This is the opposite of what happens to Japanese tax-advantaged accounts — when I moved, I had to unwind a NISA-based mutual fund position because non-residents can’t keep contributing. US retirement accounts don’t work that way. (If you also hold Japanese funds as a US person, that’s a separate and much nastier problem — see PFIC and Japanese funds for US persons.)

The three options at a glance

A couple of mechanics worth knowing:

• You usually don’t have to move an old 401(k) at all. Under SECURE 2.0, plans can only force out balances of $7,000 or less. Above that, you can leave it parked with the old employer indefinitely.
• A direct rollover is a non-event. Trustee-to-trustee, plan → IRA, no withholding, not taxable, no deadline. This is the default low-friction move.

Why cashing out is the expensive mistake

If you take the money before age 59½, you get hit twice:

• Ordinary federal income tax on the full amount, at your bracket.
• A 10% additional tax on top (IRC §72(t)).

Run the numbers. In the 22% bracket, that’s roughly a 32% effective hit. In the 37% bracket, about 47%. On a $100,000 balance that’s $32,000–$47,000 gone — money you spent years and an employer match building. Compare that to a direct rollover, which costs you nothing. There is almost no version of “I need cash for the move” where cashing out a retirement account beats other options once you see that gap.

Two narrow exceptions people ask about:

• Rule of 55 — if you separate from your employer in or after the year you turn 55, you can take penalty-free distributions from that specific 401(k) (not IRAs). Still taxable as income, just no 10% penalty.
• SEPP / 72(t) — “substantially equal periodic payments” let you access money early without the penalty, but you lock into a multi-year schedule that’s painful to change. Not a casual move.

The rollover trap: do it before you become a non-resident

This is the part that catches non-US citizens specifically, and it’s the reason timing matters.

• Direct rollover: no withholding, not taxable. Fine.
• Indirect (60-day) rollover: the plan must withhold 20% if you’re a US resident — or 30% if you’ve become a non-resident alien (NRA) — and you have 60 calendar days to replace the withheld cash from your own pocket or it’s treated as a taxable distribution (plus the 10% penalty if under 59½).
• NRAs can’t do a direct rollover into a US IRA at all (needs verification — confirm with a cross-border tax professional before acting).

So if you’re leaving an employer and leaving the country, the clean sequence is: roll the 401(k) into a Traditional IRA while you’re still a US resident, before your status changes. Do it in the wrong order and you can trip into 30% withholding and lose rollover flexibility entirely.

Decision guide:

• If you’re a US citizen → you stay a “US person” living abroad. Ordinary income-tax rates keep applying (not the flat 30% NRA rate). Leave or roll; don’t cash out.
• If you’re a non-citizen leaving an employer → roll to a Traditional IRA before departure, while still resident, to dodge the NRA withholding mess.
• If you’re a non-citizen with an old 401(k) you’re keeping in place → leave it; just confirm the custodian will keep serving a non-US address (see the access section below).
• If you’re under 59½ and tempted to cash out → stop and price the 10% penalty plus your bracket first. It’s usually the wrong call.

What Japan does — and doesn’t — recognize

Two things surprised me when I researched the Japan side.

The treaty doesn’t save US citizens. Article 17(1) of the US–Japan tax treaty says pensions are taxable “only in the state of which the recipient is a resident” — but the treaty’s saving clause lets the US tax its own citizens as if the treaty didn’t exist. So a US citizen in Japan can face taxing claims from both countries, with the Foreign Tax Credit (Form 1116) as the main tool to avoid double taxation.

Japan doesn’t honor the tax-deferral. Japan’s NTA does not recognize the tax-deferred status of a 401(k) or IRA. For a permanent tax resident (more than 5 of the last 10 years in Japan — needs verification against current NTA guidance), worldwide income is taxable — and the gains, dividends, and interest earned inside these accounts can be treated as current Japanese income. Roth’s US tax-free growth isn’t recognized either. During your first years, as a non-permanent resident (fewer than 5 of the last 10 years in Japan — needs verification), Japan generally taxes only Japan-source income plus foreign income you remit — so leaving distributions in the US and not remitting can limit exposure early on. This is exactly the kind of thing to confirm with a Japan-side professional; the treatment of annual in-account income isn’t settled in a single public ruling. Your first tax year after leaving the US is where this starts to bite.

The checklist that actually matters: before you leave

The money decisions are usually simple. The administrative ones are where people get locked out, sometimes for months. Set these up before you get on the plane:

1. Test online access from outside the US. Some custodians geo-block logins or force re-verification. Confirm you can get in from abroad — ideally before you’ve left.
2. Update your beneficiary designations. Under the SECURE Act, most non-spouse beneficiaries now face a 10-year distribution rule on inherited accounts. Make sure names are current.
3. Protect your 2FA phone number. This is the one that scares me most. My US bank and brokerage logins are all tied to my phone number — if that number dies when my carrier SIM deactivates abroad, I can’t authenticate. I plan to keep my US number alive on a cheap VoIP plan for exactly this reason. Sort this out first: keep a US phone number for 2FA and Google Voice vs a real US number.
4. Think before changing your address. Switching to a Japanese address can trigger account restrictions at some custodians — see brokerage address change from Japan and keeping a US brokerage when moving to Japan.

Because the US and Japan both have a claim on this income, the reporting can get genuinely complicated — the Foreign Tax Credit, the timing of distributions, non-permanent-resident status. If you’d rather not learn cross-border return-matching by trial and error, a US–Japan expat specialist is one place to start. Taxes for Expats works this niche: taxesforexpats.com — that link gives $25 off your first filing. (Full disclosure: that’s a referral link. It’s one option, not the only one — compare a couple of firms and confirm anything here against official IRS and NTA pages before you act.)

FAQ

Do I have to close my 401(k) or IRA when I move to Japan?

No. US-based 401(k) plans and IRAs stay with your US custodian and are exempt from FBAR and FATCA reporting, so nothing forces you to close or move them. The main practical question is whether your specific custodian will keep serving a non-US address — confirm that before you leave.

I’m not a US citizen. Should I roll my 401(k) before I go?

If you’re leaving your employer, yes — doing a direct rollover into a Traditional IRA while you’re still a US resident avoids the 30% withholding that hits non-resident aliens on indirect distributions, and non-residents can’t do a direct rollover at all. If you’re leaving the 401(k) in place with the old employer, you don’t need to move it; just verify the plan will keep serving your Japanese address.

Is cashing out ever worth it?

Rarely. Under 59½ you pay ordinary income tax plus a 10% penalty — roughly 32% in the 22% bracket, up to 47% in the 37% bracket. Unless you qualify for a narrow exception like the Rule of 55, a direct rollover costs nothing and keeps the money working. That gap doesn’t close no matter how good the move feels in the moment.