ETF Investing in Japan
Japan's revamped NISA made tax-free investing dramatically more generous in 2024. Pair it with iDeCo and you have two powerful wrappers — here's how to use both.
Don't have time? Here's what you need to know:
- 1The 2024 NISA overhaul made the tax-free allowance permanent and raised limits — fill it before any taxable account, where income is taxed at 20.315%.
- 2iDeCo adds an upfront income-tax deduction and tax-free growth, but locks money until age 60; many investors use both wrappers.
- 3Japanese investors can buy US ETFs (unlike EU retail), but cheap NISA-eligible index funds like eMaxis Slim are often the simplest core.
- 4Yen currency risk cuts both ways — recent foreign-fund gains owe much to yen weakness that can reverse.
The New NISA: Japan's Tax-Free Investing Wrapper
Japan overhauled its NISA (Nippon Individual Savings Account) in 2024, and it's now the single most important account for Japanese retail investors. Inside a NISA, gains and dividends are entirely tax-free — no 20.315% levy on what you earn. The revamped system made the tax-free allowance permanent (no longer time-limited), raised the annual and lifetime contribution limits substantially, and split contributions into a 'tsumitate' (regular accumulation) portion for eligible funds and a 'growth' portion with broader investment choice.
For a long-term investor the logic is simple: fill your NISA first. Outside it, investment income is taxed at 20.315% (15% income tax, 0.315% reconstruction surtax, and 5% local tax), so sheltering as much as possible inside the NISA is the highest-value move. Verify the current contribution limits, as they're set by policy and the system is still relatively new.
Tip: Prioritize the NISA before any taxable account. Tax-free compounding on a permanent allowance is worth far more over decades than the same money in a 20.315%-taxed account.
iDeCo: Retirement Investing With a Deduction
iDeCo (the individual-type Defined Contribution pension) is Japan's other major tax-advantaged wrapper, aimed at retirement. Contributions are deductible from your taxable income, investments grow tax-free inside the account, and withdrawals — available from age 60 — receive favourable retirement-income tax treatment. The annual contribution cap depends on your employment status and existing pension coverage.
The trade-off versus NISA is access: NISA money can be withdrawn anytime, while iDeCo locks funds until 60. A common Japanese approach is to use iDeCo for genuinely long-term retirement money (capturing the upfront income-tax deduction) and NISA for tax-free investing you might want more flexibility around. Many investors contribute to both, filling iDeCo to its cap and then using the larger NISA allowance.
| Feature | NISA | iDeCo |
|---|---|---|
| Tax on gains | Tax-free | Tax-free inside account |
| Contribution deduction | No | Yes (income deductible) |
| Withdrawals | Anytime | From age 60 |
| Best for | Flexible tax-free investing | Locked-in retirement money |
Tokyo-Listed ETFs, Mutual Funds, and US Access
Japanese investors have several routes to global exposure. Tokyo Stock Exchange-listed ETFs cover domestic and international indexes. Hugely popular, though, are low-cost index mutual funds — the eMaxis Slim series (such as 'All Country' and 'S&P 500') became default choices precisely because they're cheap, NISA-eligible, and let you accumulate small monthly amounts without trading on an exchange.
Japanese brokers can also offer access to US-listed ETFs like VTI and VOO — unlike EU retail investors, Japanese investors are not blocked by PRIIPs, so US funds are a genuine option here. The catch is US dividend withholding (typically 30%, or 10% under the US-Japan treaty if correctly documented) and, for a NISA, the fact that foreign tax credits don't fully work inside a tax-free wrapper. For many Japanese investors the simplest, cheapest path is a NISA-eligible eMaxis Slim global or S&P 500 fund.
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The Yen Question: Currency Risk for Japanese Investors
If you invest globally from Japan, currency matters enormously. A US or world equity fund is effectively a bet on foreign assets plus the dollar (or other currencies) against the yen. When the yen weakens, your foreign holdings rise in yen terms — a major tailwind in recent years — but a strengthening yen would work the other way. This currency risk cuts both directions.
Some Japanese funds offer yen-hedged share classes that strip out the currency move, leaving you with the underlying market return; others are unhedged. There's no universally right answer — hedging removes a source of both gains and losses, and costs a little. Many long-term investors hold unhedged global funds for simplicity and accept yen volatility, while keeping any shorter-term money in yen. Decide deliberately rather than by accident, and automate contributions into your NISA either way.
Important: Don't confuse a weak-yen tailwind with fund skill. Much of a Japanese investor's recent gains on US funds came from yen depreciation, which can reverse. Size your foreign exposure for a world where the yen strengthens too.
Frequently Asked Questions
What is the new NISA and how is it different?
NISA is Japan's tax-free investment account. The 2024 overhaul made the tax-free allowance permanent rather than time-limited, raised the annual and lifetime contribution limits substantially, and split it into a tsumitate (accumulation) portion and a growth portion. Inside a NISA, gains and dividends escape the 20.315% tax that applies to a normal taxable account, so most Japanese investors fill it first.
Should I use NISA or iDeCo?
Both, ideally. iDeCo gives an upfront income-tax deduction and tax-free growth but locks money until age 60. NISA offers tax-free gains with anytime access but no contribution deduction. A common approach is to fund iDeCo for retirement money (capturing the deduction) and use the larger NISA allowance for more flexible tax-free investing. Contribution caps depend on your employment and pension situation.
Can Japanese investors buy US ETFs like VOO?
Yes. Unlike EU retail investors, Japanese investors aren't blocked by PRIIPs rules, so brokers can offer US-listed ETFs like VOO and VTI. Be aware of US dividend withholding (10% under the US-Japan treaty if documented, otherwise 30%) and that foreign tax credits don't fully apply inside a tax-free NISA. Many investors instead choose cheap, NISA-eligible domestic index funds like the eMaxis Slim series.
How much does yen currency risk matter for Japanese investors?
A lot. Global equity funds are effectively a bet on foreign assets plus foreign currencies against the yen. A weakening yen has boosted Japanese investors' foreign returns recently, but a strengthening yen would reduce them. You can choose yen-hedged share classes to remove the currency effect or hold unhedged funds for simplicity. Either way, decide deliberately and don't mistake a weak-yen tailwind for permanent gains.
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Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.