How hedging works, what it costs, and why hedging often suits foreign bonds more than long-horizon equities.
A hedged fund uses derivatives to reduce exchange-rate movement, at a cost tied to interest-rate differences; hedging is often more compelling for lower-volatility foreign bonds than for long-horizon equities, where many investors keep currency diversification.
An unhedged foreign fund gives you the asset plus the exchange rate. A currency-hedged fund uses forward contracts or similar arrangements to offset most of the exchange-rate movement, so your yen return more closely reflects the asset’s performance in its own currency. The hedge is never perfect and it is not permanent — it is rolled over periodically.
Crucially, hedging has a cost that is not a fixed fee. It depends significantly on the interest-rate differential between the yen and the foreign currency: when foreign short-term rates are much higher than Japan’s, hedging that currency tends to be more expensive. This cost is separate from, and additional to, the fund’s expense ratio.
The case for hedging is strongest where currency swings can overwhelm the asset’s own return. Foreign bonds are the classic example: their expected returns are modest, so a large exchange-rate move can dominate the result. If your reason for holding foreign bonds is yen stability, an unhedged version can defeat the purpose, and a hedged version is often more consistent with the goal.
For equities held over decades, the picture differs. Equity returns are large and volatile enough that currency is a smaller share of total risk, and many long-horizon investors deliberately retain unhedged foreign currency as diversification — a hedge against the yen itself weakening over their lifetime. Neither choice is universally right.
Many fund families offer both a hedged (為替ヘッジあり) and an unhedged (為替ヘッジなし) version of the same strategy under nearly identical names. Before buying, confirm which version you are holding, read the stated hedging policy in the prospectus, and note that the hedge ratio and cost can change.
A simple yen-return illustration: if a foreign bond returns 3% in its currency and the yen weakens 5%, the unhedged yen return is roughly 8%, while a hedged version aims for about 3% minus hedging cost; if the yen strengthens 5% instead, unhedged is roughly −2% while hedged still targets about 3% minus cost. Same asset, very different yen outcomes.
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.