How to Start Investing in Japan: NISA for Beginners

Quick Answer: For most people in Japan, the best first investment is a NISA — a tax-free account where investment gains that would normally be taxed at 20.315% are tax-free instead. To start, you need to be a resident aged 18+ with a My Number, open a NISA with one broker (online brokers are the usual choice), and set up a monthly automatic purchase of a low-cost global index fund inside the tsumitate (accumulation) quota. You can invest up to ¥3.6 million a year, and withdraw anytime.

Once you've handled your set-up admin and can read your payslip, the single highest-value money habit in Japan is simple: start investing tax-free, early, and automatically. This guide shows a beginner exactly how to do that with a NISA — the why, the how, and what to actually buy.

This is educational information, not financial or investment advice. Investing carries risk, including loss of principal. Brokers and funds are named factually for orientation only — not recommendations. Confirm details with the FSA or a qualified professional, and do your own research.

Part of our First Year in Japan: Money Starter Kit — the 30/60/90-day path for newcomers.

Why should NISA be your first investment in Japan?

Because it removes tax from your returns. Outside a NISA, investment gains and dividends in Japan are taxed at about 20.315%. Inside a NISA, they're tax-free, with no time limit on the exemption.

Two things make it the right first account rather than iDeCo:

A common sequence for foreign residents is NISA first, then add iDeCo once your stay is stable and the upfront tax deduction is worth the lock-in.

How do you open a NISA account?

The requirements are straightforward:

  1. Be eligible. You must be a resident of Japan aged 18 or over with a My Number. You can hold one NISA account at a time.
  2. Choose one broker. Most beginners use an online broker for the lowest fees and widest fund choice. You open a regular brokerage account and a NISA account together.
  3. Submit your documents. Typically your My Number and an ID/residence card. The broker verifies your details with the tax office, which can take a couple of weeks. Some brokers ask that your residence card have a certain validity period remaining, so it's worth starting while your card is well within its term.
  4. Fund it and automate. Link a bank account and set up a monthly automatic purchase so investing happens without you thinking about it.

Which broker should you choose?

Platforms differ mainly on fees, fund selection, and how much English they offer. Named factually, not as recommendations — compare current terms yourself:

Whichever you pick, the account mechanics and NISA tax treatment are the same — the differences are service and selection, not the tax break.

What do beginners actually buy inside a NISA?

A NISA is the account; you still choose investments to hold in it. The beginner-friendly path uses the tsumitate (accumulation) quota (up to ¥1.2 million a year), which is limited to a government-screened list of low-cost, long-term funds.

Most beginners choose a broadly diversified, low-cost index fund and buy it automatically every month — a strategy that spreads your purchases across market ups and downs. Two of the most widely held low-cost index-fund families in Japan (named factually, not recommended) are the eMAXIS Slim series — e.g. its "All Country" (global) and "S&P 500" (US) funds — which track large baskets of companies at very low annual cost. The point isn't the specific fund; it's broad, cheap, and automatic.

You also have the growth quota (up to ¥2.4 million a year) for individual stocks and ETFs, but most beginners don't need it on day one. Together the quotas allow up to ¥3.6 million a year, under an ¥18 million lifetime tax-free cap. For what's expanding in the system next, see NISA changes in 2026–2027.

What happens to your NISA if you leave Japan?

This is the question every foreigner should ask before opening one. Because NISA's tax-free status is tied to Japanese tax residency, leaving permanently generally means you can no longer contribute, and the account is typically closed or converted to a taxable account — you may have to sell your holdings before you depart.

Handling varies by broker and can change, so confirm with your provider well ahead of any move. It doesn't make NISA a bad first step — the tax-free growth while you're here is real — but it's why you invest in a globally diversified way you could rebuild elsewhere, rather than something Japan-locked.

How this fits your bigger plan

NISA turns your monthly surplus into tax-free compounding — and your savings rate is the single biggest lever on how fast you reach financial independence. Work out that surplus from your take-home pay with the free Japan Salary Tax Calculator, then see what consistent investing does to your timeline with the PlanTogetherFI calculator.

PlanTogetherFI is for educational planning only. It is not financial, tax, legal, or investment advice. Investing involves risk, including possible loss of principal. Brokers and funds are named factually, not recommended — confirm current terms with the provider, the FSA, or a qualified professional and do your own research.

Frequently Asked Questions

Can a foreigner open a NISA in Japan?

Generally yes. If you're a tax resident of Japan aged 18 or over with a My Number, you can usually open and use a NISA on the same terms as Japanese nationals. It's often the most accessible tax-free investing route for medium-to-long-term residents.

How much can I invest in a NISA each year?

Up to ¥1.2 million in the tsumitate (accumulation) quota and ¥2.4 million in the growth quota — ¥3.6 million combined per year — under an ¥18 million lifetime tax-free holding cap. Selling holdings frees the lifetime cap back up for reuse in a later year.

What should a beginner buy in a NISA?

Most beginners use the tsumitate quota to buy a low-cost, broadly diversified index fund automatically each month. The specific fund matters less than the principle: broad, cheap, and consistent. Investing still carries risk, so choose based on your own research and risk tolerance.

Which broker is best for a NISA?

There's no single "best" — SBI Securities, Rakuten Securities, and Interactive Brokers Japan are common choices that differ on fees, fund selection, and English support. The NISA tax treatment is identical across brokers, so compare service and selection.

Is NISA better than iDeCo for a beginner?

For most first-time investors, NISA comes first because it's flexible and easier to unwind if you leave Japan, though it gives no upfront tax deduction. iDeCo offers a bigger upfront deduction but locks money until your 60s. Many residents start with NISA and add iDeCo once settled.

Sources and further reading

Figures reflect the NISA system as of 2026 and may change. Always confirm your own limits and your broker's rules against the official sources or a qualified professional.