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Stock index ETF

Rules, protection and tax below are for Japan.

What it is

An ETF that holds every company in an index, in the same proportions, and trades on the exchange like a share. There is no manager choosing stocks, just a rule, which is why the ongoing charge can be a tenth of an active fund's.

This is the instrument behind most of the honest advice you will ever read: buy the whole market cheaply, add to it regularly, and hold for decades. It captures the long-run growth of business without betting on which businesses.

It is still shares. A world index has fallen by half in a bad crash and taken years to recover. The reason it works is that people who kept adding through those years ended up well ahead; the reason it fails is that people sell at the bottom.

How it works

  1. The fund buys the index's constituents and issues shares that trade on the exchange all day.
  2. Large investors keep the price close to the holdings' value by creating or redeeming blocks of shares.
  3. The ongoing charge, typically 0.05 to 0.3 percent a year, is taken from the fund's assets.
  4. Dividends from the companies are paid out or reinvested, depending on the share class.

The honest pros and cons

For

  • The cheapest way to own hundreds or thousands of companies at once.
  • No manager risk: you get the market's return minus a tiny fee.
  • Trades any time the exchange is open, with a small spread.
  • Ideal for regular monthly investing.

Against

  • Falls as hard as the market it copies; a 30 to 50 percent drawdown is normal once a decade.
  • Which index matters: a home-country index is far less spread than a world one.
  • Foreign-listed funds can bring currency risk and withholding tax.
  • Some ETFs use derivatives to copy the index; check it holds the real shares if that matters to you.

Getting it in Japan

Stock index ETF available

Online brokers run tsumitate NISA plans that buy a chosen fund every month, and the funds eligible for the quota must be low cost by rule. Tokyo-listed ETFs are the alternative for the growth quota. Outside NISA a designated account withholds the 20.315 percent tax so no return is needed.

  • Account type: NISA (Nippon Individual Savings Account) (dividends, distributions and gains inside are tax free for as long as you hold)
  • Account type: iDeCo (individual defined contribution pension) (contributions are deducted from taxable income, growth is tax free, and payouts after 60 get pension tax treatment)
  • Account type: Ordinary or designated (tokutei) brokerage account (interest, dividends and gains are taxed at a flat 20.315 percent, withheld at source in a designated account)
  • Your protection: fund assets are held by a trust bank separate from the seller; the Japan Investor Protection Fund covers up to 10 million yen per customer if a broker fails, never market falls (source, checked 2026-09-17)
  • Tax here: inside NISA distributions and gains are tax free; outside they are taxed at a flat 20.315 percent (source, checked 2026-09-17)

How to start

  1. Open a NISA at an online broker and choose the tsumitate quota.
  2. Pick a world index fund from the eligible list, the one with the lowest ongoing fee.
  3. Set the monthly amount and the debit date; the plan buys on its own from then on.

Wherever you are

  1. Pick the index first: world or global funds spread furthest; single-country funds bet on one economy.
  2. Compare the ongoing charge and the fund's size; large, cheap and physically backed is the usual choice.
  3. Buy through your broker inside a tax shelter, set up a monthly purchase, and stop checking the price.

Try it

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Getting it from another country

Via United States allowed· available there

Open the foreign shares service at a Japanese online broker; the W-8BEN form it files for you sets US dividend withholding at 10 percent under the treaty. Inside NISA the Japanese side of the tax disappears but the US 10 percent stays.

What you gain

  • A far bigger menu of companies and funds than the Tokyo exchange.
  • US-listed funds are cheap, and NISA's growth quota can hold them.
  • The same broker, the same app, in most cases.

What you give up

  • Currency risk: a rising yen shrinks dollar gains when you convert back.
  • Currency conversion spreads at each step.
  • The 10 percent US withholding tax on dividends is not refunded inside NISA.
  • Tax: US dividends carry 10 percent withholding under the treaty; Japan taxes the rest at 20.315 percent outside NISA with a foreign tax credit (source, checked 2026-09-17)

Currency reality check

The same JPY 1,000 left for 10 years, at each country's savings rate:

Kept in JPY at about 0.1% a year

JPY 1,008

Sent to USD at about 2.5% a year, the account would show

USD 11 the tempting number

Brought back to JPY after the exchange rate moved 35.8%

JPY 1,735 what you can actually spend

Before tax, before fees, and before the risk that the exchange rate does something quite different next time. A higher rate abroad is only a higher return once it has survived the conversion back.

Go deeper

Also called

index tracker, tracker fund, world ETF, S&P 500 ETF, passive fund

Often confused with

  • Domestic shares: Part ownership of a company listed in your own country.
  • Mutual fund: A pool of many investors' money run by a manager who buys a basket of assets for a yearly fee.
  • Leveraged or inverse ETF: A fund that multiplies or reverses an index's daily move; over time the multiplication compounds losses fast.

Learn more, for free

Stock index ETF in Japan · wealth-coop