Currency-Hedged Index vs Unhedged: What the Difference Means for Returns

A currency-hedged index strips out foreign-exchange movements, locking returns to the underlying stocks alone. An unhedged index includes currency swings as part of total return. For a US investor, the choice between them determines whether rising or falling dollars amplify gains or create losses — and costs real money in fees and trading. Understanding the gap requires working through how currency risk translates into performance differences.

The Core Difference: One Index, Two Currencies

Suppose a US investor buys an international stock index that holds companies in Europe, Japan, Australia, and other countries. Those stocks trade in euros, yen, Australian dollars, and so on.

An unhedged index simply adds up the returns in US dollars. If a Japanese stock rises 10% in yen, and the yen strengthens 5% against the dollar, the unhedged investor sees a total return of roughly 15.5%. If the yen weakens 5%, the total return is closer to 4.5%. The currency swing is baked into the final number.

A hedged index uses currency forwards or currency swaps to lock in the exchange rate at the time of investment. The manager agrees to exchange yen back into dollars at a fixed rate in the future, regardless of where the spot rate moves. This removes currency uncertainty. A 10% stock gain stays a 10% gain, unaffected by yen movement.

The catch: hedging is not free. The manager must execute forward contracts, which carry a bid-ask spread, and the cost of those contracts — determined by interest rate differentials between the US and foreign countries — typically runs 0.1% to 0.5% per year. Over a decade, that gap compounds.

Worked Example: The Dollar’s Strength Matters

Let’s say on January 1, a US investor can buy a Japanese stock for ¥10,000, which costs $100 (a 100:1 rate).

Scenario A: Unhedged, Weak Dollar

• Stock rises to ¥11,000 (10% gain in yen).
• Over the year, the yen strengthens; the rate moves to 95:1 (dollar weakens).
• In US dollars, the stock is now worth $115.79 (11,000 ÷ 95).
• Total return: 15.79% (stock gain plus currency tailwind).

Scenario B: Unhedged, Strong Dollar

• Stock rises to ¥11,000 (10% gain in yen).
• Over the year, the yen weakens; the rate moves to 105:1 (dollar strengthens).
• In US dollars, the stock is now worth $104.76 (11,000 ÷ 105).
• Total return: 4.76% (stock gain partially offset by currency headwind).

Scenario C: Hedged

• Stock rises to ¥11,000.
• Manager locked in the 100:1 rate at the start via a forward contract.
• Investor receives $110, plus or minus the hedging cost (say, –$0.25).
• Net return: roughly 9.75% (the stock gain minus the small hedge fee).

Notice the spread: Scenario A (unhedged, weak dollar) delivered 15.79%, while Scenario C (hedged) delivered 9.75%. The difference is entirely currency movement. Scenario B shows the opposite: the unhedged investor lagged because the dollar strengthened.

Over many years, the cumulative effect of currency movements can dwarf stock selection differences between indices.

Why the Choice Matters for Returns

From a US-based investor’s perspective:

If you are unhedged: you are making a currency bet in addition to your stock bet. You are betting that foreign currencies will strengthen relative to the dollar (or at least not weaken much). This is a second bet hidden inside the index. Many investors do not realize they are taking it.

If you are hedged: you are removing that bet and paying a small fee to do so. Your returns will track the foreign stock performance alone, minus the hedge cost. You are not positioning on currency risk.

A crucial insight: neither choice is “better” in the abstract. Over certain periods, the dollar strengthens (unhedged underperforms), and over others, the dollar weakens (unhedged outperforms). If you believe the dollar will weaken over your holding period, unhedged offers free optionality. If you believe the dollar will strengthen, hedged protects you but costs 0.15–0.4% annually in fees.

The Historical Record

From 2010 to 2021, the US dollar was generally strong. Investors in unhedged international indices faced a sustained headwind. A US investor in unhedged European or Japanese equities would have seen returns diminished by the strong dollar, even as local stocks performed decently.

From 2001 to 2008, the opposite occurred: the dollar weakened sharply, and unhedged international indices got a boost from currency tailwinds on top of solid stock returns.

The implication: over a full market cycle, currency effects can add or subtract 2–4 percentage points annually from returns, depending on the direction and volatility of the dollar.

Hedging Costs in Detail

The explicit cost of a currency-hedged index fund is typically:

• Management fee: 0.15% to 0.40% per year (slightly higher than unhedged, which might be 0.08% to 0.15%).
• Implicit hedging cost: 0.05% to 0.25% per year, reflecting the interest rate differential between US and foreign yields and the bid-ask spread on forwards.

In a low-interest-rate environment (like 2010–2020), the implicit cost was minimal because US and foreign rates were similar. When the Federal Reserve raises rates and the spread between US and foreign yields widens, hedging becomes more expensive.

Over 10 years, a 0.3% annual hedge cost compounds to a 3% cumulative drag, which is material.

Who Should Hedge?

Unhedged makes sense if:

• You have a long time horizon (10+ years) and can tolerate volatility.
• You believe foreign currencies will appreciate (or at least not depreciate significantly).
• The index or fund is a small portion of your portfolio; currency diversification is a feature, not a bug.
• You want to minimize explicit costs.

Hedged makes sense if:

• You want predictable, currency-neutral returns from your international allocation.
• You are primarily interested in stock selection, not currency betting.
• Currency volatility unsettles you.
• Your home currency is weakening, and you want exposure to foreign currency as a hedge elsewhere in your portfolio.

Currency-Hedged Index Funds

Many providers offer currency-hedged versions of popular indices:

• Hedged versions of MSCI EAFE (Europe, Australia, Far East) or MSCI World.
• ETFs and mutual funds tracking these hedged benchmarks.

The hedged version will typically trade at a slightly higher expense ratio than the unhedged, and performance relative to unhedged will depend entirely on currency movement. In years when the dollar strengthens, hedged outperforms. In years of dollar weakness, unhedged wins.

See also