Investing When You Leave Japan: NISA, iDeCo and Your Brokerage Account

Quick Answer: Leaving Japan quietly unwinds most of your investing setup. Your 特定口座 is deemed closed the moment you stop being a resident, your NISA closes too unless you qualify for a narrow employer-transfer exception, and your iDeCo usually locks until 60 with no further contributions. Nearly every fix has to be filed before you go.

Most guides about leaving Japan stop at the pension refund and the ward-office paperwork. The investing side gets almost no coverage — and it's the part where the mistakes are expensive and irreversible.

The uncomfortable shape of it: the accounts that made investing in Japan attractive are all tied to residency. NISA, the 特定口座 that spares you an annual tax return, and iDeCo's tax deduction are benefits Japan grants to residents. Stop being one and each is withdrawn on its own schedule, mostly automatically, mostly without anyone telling you first.

None of this is a reason to avoid investing in Japan. It is a reason to know the exit rules on the day you open the account rather than in your final month, because a few of the doors only open from the inside — while you're still here.

This is educational information, not financial or tax advice. Rules, broker policies, and tax treatment change, and your destination country's rules matter as much as Japan's — confirm the specifics with your provider, the NTA, the Japan Pension Service, or a qualified professional.

When do you stop being a Japanese resident — and why does the exact date matter?

Two separate clocks start when you leave, and people conflate them.

Tax residency is decided by income tax law, not by your visa. Someone leaving Japan to live or work abroad for a year or more is presumed not to have a domicile in Japan and is treated as a non-resident (非居住者) from departure; a posting of less than a year generally leaves you a resident throughout. That presumption is what triggers almost everything below.

Your residence record is separate: you file a moving-out notification (転出届) at your municipal office, which ends your resident registration and feeds the pension and health-insurance systems.

The date matters because your accounts change status on it, not when you get around to telling anyone. A broker who learns six months later that you left may treat the whole period retroactively — and, as we'll see, at least one of them reserves the right to sell your holdings for you.

What happens to your NISA when you leave Japan?

By default, it closes.

A NISA account is open to 居住者等 — residents — so when you cease to be one without filing anything, the NTA's rules treat you as having filed a 非課税口座廃止届出書: the account is deemed abolished. Nobody has to ask your permission.

There is one exception, and it is narrower than most people hope:

What closure actually does to your money. The holdings aren't confiscated or force-sold by the tax office: they are paid out of the NISA into a taxable account, and the acquisition cost becomes the market value on the payout date. So the growth you earned inside the shelter stays untaxed, and only movement after that date is taxable. The genuinely bad outcome is on the downside — a loss inside a NISA is treated as never having existed, so it can't be offset against other gains or carried forward.

And one thing no Japanese source will tell you: the NISA exemption is a Japanese tax exemption only. Your new country of residence will apply its own rules to the same holdings, and most do not recognise a foreign tax-free wrapper. Continuing your NISA from abroad can still leave you with a tax bill somewhere else.

What happens to your 特定口座 and the rest of your brokerage account?

The 特定口座 — the account type where the broker calculates your tax and you generally skip the annual return — is legally limited to residents and non-residents with a permanent establishment in Japan. When you leave and cease to be a resident, the NTA treats it as though you had filed a 特定口座廃止届出書. It is deemed abolished; there's no version of this you opt out of.

The practical consequence is bookkeeping. Holdings move into a 一般口座, where you are responsible for tracking acquisition costs and calculating gains — in a currency and a tax system you may be leaving behind.

What happens to the account itself is broker policy, not law, and the policies differ sharply: sell-only at some firms, no foreign-stock trades at others, and at Monex a dormant account with withdrawals only and 11 business days' notice required before departure. SBI states it may sell or settle the holdings of a customer who became a non-resident without completing the paperwork — forced liquidation on someone else's timing. The firm-by-firm detail is in how to open a brokerage account in Japan as a foreigner.

The decision this forces: work out before you leave whether you are selling or holding. "I'll decide later" is not on the menu when later means an account you can only watch.

What happens to your iDeCo — and why is it the one you can't undo?

This is where foreign residents lose the most, because iDeCo's lock is designed to be unbreakable.

A foreign national living abroad cannot be an iDeCo contributor. Enrolment depends on being covered by Japan's National Pension, and leaving Japan ends that coverage. There is a striking asymmetry here for international couples: a Japanese national aged 20–65 living abroad can enrol voluntarily in the National Pension and keep contributing to iDeCo; a foreign national abroad cannot. One partner keeps building; the other stops.

What you become instead is a 運用指図者 — an instruction-only holder. Your money stays invested and you can switch funds, but:

Can you cash it out? Only through the 脱退一時金, whose conditions are deliberately tight. The National Pension Fund Association requires all of the following: you are under 60; you're not in a corporate DC plan; you're someone who cannot join iDeCo (a foreign national living abroad qualifies); you're not a Japanese national aged 20–60 living abroad; you don't hold a DC disability benefit entitlement; your total contribution period is 5 years or less or your assets are ¥250,000 or less; and you claim within 2 years of last losing member status.

Read the sixth condition carefully, because it's the trap: contribute steadily for six or seven years and build a balance above ¥250,000, and you satisfy neither limb. The exit closes. The money sits in Japan, paying ¥66 a month, until you turn 60 — potentially decades of a small account you can't touch, in a currency you may no longer spend.

That single fact should shape the NISA-versus-iDeCo decision for anyone whose stay in Japan is open-ended. The tax deduction is real, but it is bought with a lock that assumes you'll retire here. See iDeCo for beginners: is it worth it in your first years in Japan? and iDeCo 2026–2027 changes for foreigners; if you're weighing the two, how to invest in Japan as a foreigner puts them in order.

Will Japan still tax your investments after you leave?

Partly — and less than most people expect, which is its own trap, because your new country picks up what Japan drops.

Dividends: yes. Listed-share dividends paid to a non-resident are subject to 15.315% withholding (income tax plus the reconstruction surtax, without the 5% resident tax a resident pays), for holders of less than 3% of the issuer. A tax treaty between Japan and your new country may reduce that, but only if you file the treaty notification (租税条約に関する届出書) with the payer.

Capital gains on listed shares: generally no. A non-resident without a permanent establishment in Japan is taxed only on Japanese-source income, and an ordinary sale of listed shares usually isn't. The NTA lists the exceptions, and they're worth scanning: "business-transfer-like" sales where related parties held 25% or more and you sell 5% or more, shares in companies whose assets are 50%+ Japanese real estate, shares from tax-qualified stock options, sales made during a stay in Japan, and golf-club memberships.

That last one catches people: selling while back in Japan on a visit is a different transaction, tax-wise, from selling from abroad.

And then your new country taxes you. Most countries tax residents on worldwide investment income and gains, so the practical question isn't "does Japan still tax this?" but "which country's rules apply to a sale, and when do I want it to happen?" Timing a large sale either side of a move is exactly the situation to take to a professional in both countries — the cross-border version of the problem is covered in expat FIRE: planning retirement across two countries.

Does Japan's exit tax apply to you?

Probably not — but check, because the answer turns on your visa rather than your wealth.

Japan's 国外転出時課税制度 taxes unrealised gains on departure, treating the move as a deemed sale. It applies when both conditions are met:

  1. You hold ¥100 million or more in securities and similar assets (shares, investment trusts, unsettled derivative positions), and
  2. You had a domicile or residence in Japan for more than 5 of the 10 years before departure.

The second test is where foreign residents usually fall out. Time spent in Japan under a Table 1 status of residence — the work-based visas under 出入国管理及び難民認定法別表第一, such as Engineer/Specialist in Humanities, Business Manager, Professor and the rest — is not counted toward the five years. Someone on a work visa can spend a decade here and still fail the residence test, whatever their portfolio is worth.

Permanent residents, spouses of Japanese nationals and long-term residents are different. Those are Table 2 statuses and the time does count (for periods from 1 July 2015 onward). If you hold, or are applying for, permanent residence and your investments are approaching nine figures, this belongs on your checklist before you file the moving-out notification.

If it does apply, timing follows your paperwork: without a tax representative you must file a 準確定申告 covering 1 January to the departure date and pay before you leave; with one appointed, you file a normal return in the following tax season. Deferral of up to 5 years (extendable to 10) is available with a tax representative, collateral, and annual continuation filings.

What about resident tax and your final tax return?

Two bills tend to arrive after people think they're finished.

Resident tax (住民税) runs a year behind. Liability is set on the 1 January assessment date: if you had an address in a Japanese municipality on that date, you owe that year's resident tax on the previous year's income — regardless of nationality, and regardless of leaving in February. Employers often collect the remaining balance as a lump sum from your final salary; otherwise the municipality expects you to appoint a 納税管理人 (tax representative) before departure to receive the bills and pay on your behalf.

Income tax gets a departure return. Leave without appointing a tax representative and you must file a 準確定申告 for 1 January to your departure date before you go. Appoint one, and you file normally the following February–March, covering both your resident period and any Japanese-source income afterwards.

The tax representative is the single highest-leverage piece of paperwork on this list, because it also unlocks the pension refund's tax reclaim: the Employees' Pension lump sum has about 20.42% withheld, and most of it comes back only if a representative files for you. The full procedure is in getting your pension refund when leaving Japan.

So what should you actually do, and when?

A rough order of operations. Adjust to your own situation — and note how much of it is only doable while you're still a resident.

Three months out

One month out

Final weeks

After you land

And if you're coming back? Say so on the way out. The NISA continuation route exists precisely for people returning within five years, and filing a 帰国届出書 on your return restarts normal treatment. Nothing about the return trip is retroactive, though — the notification you didn't file before leaving cannot be filed afterwards.

Whether you leave or stay, the number that matters is what all of this does to your plan. Model both paths — Japan-based and abroad — in the PlanTogetherFI calculator, and if a partner is involved, see FIRE in Japan: NISA, currency and retirement planning.

Frequently Asked Questions

Can I keep my NISA if I move abroad?

Only in narrow circumstances. You must file a 継続適用届出書 with your broker before you leave, and the exception is written for temporary departures on an employer transfer order or a comparable unavoidable reason — brokers apply it strictly. The exemption then lasts until you file a return notification or 31 December of the year five years after filing, whichever comes first, and you cannot buy anything in the meantime. Otherwise the account is treated as closed.

Can I keep contributing to iDeCo after leaving Japan?

No, if you're a foreign national. iDeCo enrolment depends on Japanese public-pension coverage, which ends when you leave, so you become a 運用指図者 — invested but not contributing. Japanese nationals aged 20–65 living abroad are the exception: they can enrol voluntarily in the National Pension and keep contributing.

Can I cash out my iDeCo when I leave Japan?

Only if you meet every condition for the 脱退一時金, and the binding one is that your total contribution period is 5 years or less or your assets are ¥250,000 or less. Above both, there is no early exit and the money stays locked until 60. You must also be under 60 and claim within 2 years of losing member status.

Will Japan tax my investments after I become a non-resident?

Dividends on listed Japanese shares are withheld at 15.315%, reducible under a tax treaty if you file the notification. Capital gains on ordinary sales of listed shares are generally outside Japanese tax for a non-resident without a permanent establishment, subject to specific exceptions — including sales made during a stay in Japan. Your new country of residence will apply its own rules.

Does Japan's exit tax apply to foreigners on work visas?

Rarely. It requires ¥100 million or more in securities and more than 5 of the last 10 years of residence in Japan — and time spent under a Table 1 (work-based) status of residence doesn't count toward those five years. Permanent residents and spouses of Japanese nationals hold Table 2 statuses, where the time does count from 1 July 2015 onward.

Do I still owe Japanese resident tax after I leave?

Yes, if you had an address in a Japanese municipality on 1 January of that year — resident tax is charged on the previous year's income, so leaving in the spring doesn't cancel the bill. It's usually collected as a lump sum from your final salary, or through a tax representative you appoint before departure.

What is a 納税管理人 and do I need one?

A tax representative: any trusted person resident in Japan who receives your tax mail and files or pays on your behalf. You need one if you want to file your final income tax return in the normal season rather than before departure, if a resident-tax balance will outlive your stay, or if you want to reclaim the roughly 20.42% withheld from an Employees' Pension lump sum. It is the cheapest insurance on this list.

PlanTogetherFI is for educational planning only. It is not financial or tax advice. Tax rules, broker policies, and pension conditions change, and your destination country's rules apply alongside Japan's — confirm your own position with the NTA, the Japan Pension Service, your provider, and a qualified professional in both countries before acting.

Sources and further reading

Rules, fees, and broker policies reflect published terms as of August 2026 and change often. Confirm directly with each institution, and with the NTA and the Japan Pension Service, before acting.