Rakuten Securities
楽天証券Brokerage (NISA/iDeCo) · Rakuten Securities
- Fees
- Varies
- English
- Partial
A leading low-cost brokerage for NISA and index-fund investing, integrated with Rakuten points and Rakuten Bank.
Currency-hedged vs unhedged funds
How hedging works, what it costs, and why hedging often suits foreign bonds more than long-horizon equities.
Direct answers
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.
Key points
- Hedging aims to strip out exchange-rate movement so returns track the asset in yen terms.
- Hedging is not free: its cost depends largely on interest-rate differentials and implementation.
- For foreign bonds, currency swings can dominate returns, so hedging often makes sense.
- For long-horizon equities, some investors deliberately keep unhedged currency diversification.
- Read the fund name and policy carefully — hedged and unhedged versions often share a brand.
How hedging works
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.
Bonds vs equities
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.
Reading a fund’s hedging policy
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.
Who this is for
- Investors choosing between hedged and unhedged versions
- People buying foreign bond funds
What this is not
- Anyone expecting hedging to remove all risk
- Readers seeking a currency forecast
Important cautions
- Hedging reduces some currency movement but costs money and is imperfect; it is not a guarantee of yen stability.
Related products & services
SBI Securities
SBI証券Brokerage (NISA/iDeCo) · SBI Securities
- Fees
- Varies
- English
- Partial
Japan’s largest online brokerage by accounts, with a very broad low-cost fund lineup and full NISA/iDeCo support.
Monex Securities
マネックス証券Brokerage (NISA/iDeCo) · Monex
- Fees
- Varies
- English
- Partial
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Frequently asked questions
What should a beginner invest in inside NISA?
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.