Whether to open NISA, portable products, broker continuation policies, and pre-departure planning for uncertain stays.
If your stay is uncertain, weigh NISA against liquid cash, favour portable and simple products, confirm each broker’s non-resident continuation policy before opening, and get the written departure procedure in advance.
If you are fairly sure you will stay several years, NISA can still be worthwhile alongside a solid cash reserve. If departure is likely soon or genuinely uncertain, weigh it carefully: NISA generally cannot continue after you become non-resident (except specific qualifying temporary-departure cases filed in advance), so a large NISA balance may have to be unwound when you leave, potentially at an inconvenient time.
A reasonable stance for uncertain stays is to keep more in liquid cash, invest modestly through portable and simple products, and avoid building a position whose forced unwind on departure would be costly or complicated.
Favour portable, simple, liquid holdings — a broad low-cost fund or widely held securities — over illiquid or administratively complex products that are hard to move or value across borders. Before opening any account, confirm the broker’s non-resident policy: whether it can maintain a taxable account after you leave, for which destination countries, and what happens to each asset type.
Plan the exit before you build the position. Obtain the broker’s written departure procedure in advance, understand that no new NISA purchases are allowed while abroad, and plan for tax, remittance of proceeds, and record-keeping in both Japan and your destination. Where holdings are material or your situation is cross-border, get individual advice.
Brokerage (NISA/iDeCo) · Rakuten Securities
A leading low-cost brokerage for NISA and index-fund investing, integrated with Rakuten points and Rakuten Bank.
Fees: Many domestic funds and trades are low- or no-commission — verify current fee schedule.
Brokerage (NISA/iDeCo) · SBI Securities
Japan’s largest online brokerage by accounts, with a very broad low-cost fund lineup and full NISA/iDeCo support.
Fees: Many trades and funds are low- or no-commission — verify current fee schedule.
Brokerage (NISA/iDeCo) · Monex
An established online brokerage often chosen for US-stock access and research tools, with NISA and iDeCo support.
Fees: Commissions vary by product; some funds/trades are low-cost — verify current schedule.
NISA is a benefit for residents. When you lose Japanese tax residency you generally cannot keep contributing, and brokerages differ on whether the account is closed, frozen, or must be sold — some allow a temporary overseas-resident continuation for limited periods. Because the tax treatment of unwinding matters, plan your exit before building a large balance and ask your brokerage about their specific offshore policy.
Generally yes, if you are a tax resident of Japan (with a My Number) and at least 18. NISA is tied to residency, not citizenship, so most foreign residents qualify — with two big cautions: US citizens and green-card holders face US tax complications with Japanese funds, and NISA generally cannot continue after you leave Japan. Confirm eligibility and the current rules on the FSA site and with your chosen brokerage.