Currency-hedged ETFs: how they work and when the hedge is worth paying for

A currency-hedged ETF holds the same underlying assets as its unhedged equivalent but uses currency forward contracts to neutralise the FX return component. For an investor based in euros holding a US equity ETF, the ETF's return in euros consists of two parts: the return of US equities in US dollars and the change in the EUR/USD exchange rate. A hedged version removes the second component, leaving only the US equity return expressed in euros. Whether this is worth paying for depends on the investor's horizon, home currency, and view on currency volatility.

What currency-hedged ETFs are

When an investor in one country buys an ETF that holds assets denominated in a foreign currency, they take on two separate sources of return and risk: the performance of the underlying assets in their local currency, and the change in the exchange rate between the two currencies. Over short periods, currency movements can dominate equity returns—a 10% rise in a foreign equity market can be fully offset by a 10% depreciation of that market's currency against the investor's home currency.

Currency-hedged ETFs address this by embedding an FX hedge directly within the fund. The fund enters into a series of short-dated currency forward contracts—typically rolling monthly—that lock in the exchange rate at which the fund's foreign currency assets will be converted back to the investor's home currency. The result is that the investor captures the return of the underlying assets denominated in the foreign currency, without bearing the risk of exchange rate movements between the two currencies.

How it works

The hedge is implemented using currency forward contracts. A forward is an agreement to exchange two currencies at a specified rate on a specified future date. The ETF sells a notional amount of the foreign currency (say, USD) forward in exchange for the home currency (say, EUR) at the current forward rate. When the forward matures—typically after one month—the fund settles the contract and rolls it to the next period.

The cost of this hedge is determined by the interest rate differential between the two currencies, as implied in the forward rate. When the foreign currency has a higher interest rate than the home currency, the forward rate implies the foreign currency will depreciate—the investor pays for the hedge. When the foreign currency has a lower interest rate, the hedge generates a positive carry for the investor. In practice, for euro-based investors hedging US dollar exposure, the hedge cost has varied from approximately −0.5% to +2.5% per year over the past decade, reflecting changes in USD/EUR interest rate differentials.

The hedge ratio—how much of the currency exposure is covered—is typically set at 100% for most standard currency-hedged ETFs, meaning the full currency exposure is removed. Some ETFs offer partial hedges (50% or 75%) for investors who want to reduce but not eliminate currency exposure.

What the evidence shows

Academic evidence on the long-run value of currency hedging for equity portfolios is mixed. Over very long periods (20 years or more), currency movements tend to mean-revert, and the expected contribution of FX returns to a diversified equity portfolio is close to zero. In this view, the hedging cost is a certain payment in exchange for removing a risk that washes out over the long run.

Over shorter periods, currency movements can be a significant source of portfolio volatility and can materially affect realised returns. Research covering the period 1995–2020 has found that currency-hedged international equity portfolios consistently exhibited lower volatility than unhedged equivalents for investors based in major currencies, with no systematic difference in average returns. The reduction in volatility was most pronounced for euro-based investors holding US equity ETFs during periods of elevated EUR/USD volatility.

Limitations and trade-offs

The hedge cost is real and recurring. In periods when the foreign currency has higher interest rates than the home currency—as has been the case for USD relative to EUR for much of the post-2015 period—currency-hedged ETFs systematically underperform their unhedged equivalents by the cost of the hedge, typically 1–2% per year. This is not a management failure; it is the explicit cost of removing FX volatility.

The hedge is never perfect. Monthly rolling hedges leave a residual currency exposure for one month at a time, and in periods of extreme currency movement within a single month, the hedge may not fully neutralise the FX impact. Additionally, the hedge ratio is calculated based on the ETF's current asset value, but the value fluctuates between roll dates. If equity markets fall significantly within the hedging period, the fund may be over-hedged—holding forward contracts that exceed the current value of the assets they are meant to cover.

For investors with very long time horizons and low sensitivity to short-term volatility, the recurring hedge cost may not be justified. For investors who need to manage short-term portfolio volatility—those near retirement, or those whose liabilities are denominated in the home currency—hedging international equity exposure reduces an avoidable source of return variability.

Currency-hedged ETFs in pfolio

pfolio's investable universe includes both hedged and unhedged share classes for many international ETFs. The currency denomination and hedge status are visible in the Assets section for each fund. When building a portfolio, selecting between hedged and unhedged versions of the same ETF affects both the expected return and the volatility contribution of the position. Currency exposure and its impact on portfolio metrics are tracked in pfolio Insights.

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