A step-by-step order of operations: build a financial base, open the right account, choose one low-cost fund, and automate it.
Build an emergency fund and clear expensive debt first, then open a NISA at a low-cost broker, buy one diversified low-cost index fund, and automate a monthly amount you can sustain.
Before buying anything, secure enough liquid cash for foreseeable expenses and emergencies, and repay expensive consumer debt such as card revolving balances. A market decline should never force you to sell investments to pay ordinary bills. A simple completion test: could you cover several months of essential spending without touching a brokerage account?
Next, check whether your employer offers matching contributions or an unusually attractive corporate pension. Employer money you would otherwise forfeit generally beats starting your own account first. Only then move to your own tax-advantaged account.
For most residents the first account is NISA, Japan’s tax-free investment wrapper: qualifying gains and dividends are exempt from Japanese tax, with a ¥1.2m recurring allowance plus a ¥2.4m growth allowance each year and an ¥18m lifetime limit. iDeCo suits money you can lock until retirement in exchange for an up-front income-tax deduction. A taxable "specified account" holds anything beyond those limits.
Choose a broker on total cost, product range, tax-account support, language, and departure policy — not on the lowest headline commission or a temporary point rate. SBI, Rakuten, Monex, and Matsui are common first comparisons for a self-directed resident; Interactive Brokers Japan has the clearest verified end-to-end English.
A strong default for a long horizon is a single broadly diversified, low-cost global-equity index fund, optionally combined with cash or bonds according to how much loss you can tolerate. This is not because global equities are guaranteed to win, but because one fund spreads across many countries and companies with little maintenance.
Place a modest first purchase so you understand how fund orders, net asset value, and settlement work, then enable a recurring monthly purchase. Recurring investing is a budgeting and behavioural tool — it does not prevent loss, but it removes the monthly decision and reduces the temptation to time the market.
Review the whole portfolio once or twice a year and after major life events, not after every headline. Rebalance toward your target weights using new contributions where possible, keep annual transaction reports for tax, and revisit the plan when income, family, or residency changes. The aim is a plan you can hold through a severe decline, not one you constantly adjust.
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.
This is education, not a recommendation. Most beginners research low-cost, broadly diversified index funds — for example all-country (全世界株式) or S&P 500 trackers — rather than picking individual stocks, because low fees and diversification are within your control while returns are not. Understand that values fall as well as rise, match the risk to your time horizon, and never invest money you may need soon.
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.