An investor based in London who buys a US equity ETF is making two bets simultaneously: a bet on US equity markets, and a bet on the US dollar. If the dollar rises against sterling, they gain. If it falls, they lose — even if the underlying equity market performs well.
Currency-hedged ETFs remove the second bet. They invest in the same underlying assets but use forward currency contracts to neutralise exchange rate movements, delivering the performance of the underlying market in the investor's home currency.
The question of whether to use a currency-hedged ETF or an unhedged one is one of the more nuanced decisions in portfolio construction. The right answer depends on your investment horizon, which currencies are involved, the cost of hedging, and what you actually need the portfolio to do.
What Is a Currency-Hedged ETF?
A currency-hedged ETF tracks the same index as its unhedged equivalent but adds a layer of foreign exchange contracts — typically rolling monthly forward contracts — that offset the currency return.
Example: An unhedged UCITS ETF tracking the S&P 500 holds US shares in USD. When you buy the ETF in GBP, your return in GBP comprises the US equity market return plus (or minus) the USD/GBP exchange rate movement.
A GBP-hedged version of the same ETF holds the same US shares but additionally enters into a monthly forward contract to sell USD and buy GBP at the forward rate. This offsets the currency exposure, delivering the USD equity return (approximately) in GBP terms.
Most major UCITS ETF providers offer currency-hedged share classes alongside unhedged versions. Examples include:
- iShares Core S&P 500 UCITS ETF (GBP Hedged)
- Vanguard S&P 500 UCITS ETF (GBP Hedged)
- iShares MSCI World UCITS ETF (GBP Hedged)
- Amundi MSCI World UCITS ETF (GBP Hedged)
Hedged share classes are typically designated with the suffix "(GBP Hedged)", "(EUR Hedged)", or similar.
The Cost of Currency Hedging
Currency hedging is not free. The cost derives from the interest rate differential between the two currencies.
Under covered interest rate parity, the forward exchange rate between two currencies reflects their interest rate differential. If interest rates in the US are higher than in the UK, the USD will trade at a forward discount to GBP — meaning USD forward contracts cost money for a UK investor hedging USD exposure back to GBP.
As of 2026, US interest rates remain above UK rates. This means UK investors hedging USD exposure to GBP pay a positive hedging cost — approximately the interest rate differential, which in recent years has been 1–2% per annum.
This hedging cost is a genuine drag on returns. If US equities return 8% in USD terms and you pay 1.5% to hedge the USD/GBP exposure, your GBP-hedged return is approximately 6.5%, not 8%.
The unhedged investor might receive the full 8% USD return — but also bears the risk that GBP/USD moves unfavourably.
When interest rates in the investment currency (USD, EUR) are higher than in the hedging currency (GBP, for example), unhedged ETFs have a return advantage all else being equal. When rates are lower (the situation that prevailed from 2010 to 2022, when US rates were near zero), hedged ETFs were relatively cheap to run.
When Currency Hedging Makes Sense
Short-Term Fixed Income
For bond investors, currency hedging is almost always appropriate.
Bond returns are lower than equity returns (by design — bonds are less risky). A 4% return on a global government bond fund can be wiped out entirely by a 4% adverse currency movement. Since bonds are held partly to reduce portfolio volatility, allowing currency risk to swamp the underlying fixed income return defeats the purpose.
Currency-hedged bond ETFs make the bond portfolio behave as intended — providing stable returns with low correlation to equities — without importing currency volatility.
This applies to:
- Global government bond ETFs
- Global investment-grade corporate bond ETFs
- Emerging market local currency debt (although here the currency exposure may be a deliberate part of the strategy)
Shorter Investment Horizons
Over shorter time periods (one to five years), currency movements can be very large relative to equity returns. An investor who may need to access their portfolio within three years and cannot afford currency volatility may prefer hedged equity exposure.
Investors With Specific Liability Matching Needs
If your liabilities are in a specific currency — you are saving to buy a property in GBP, fund GBP-denominated school fees, or retire in the UK — then hedging your assets back to GBP reduces the risk that currency movements disrupt your planning.
Concentrations in Single Currencies
An investor who already has significant USD exposure through their employer (paid in USD), their property (US real estate), or their savings (US bank accounts) may find unhedged USD equity exposure adds to existing concentration. Hedging back to GBP or EUR can provide more genuine diversification.
When Currency Hedging Does Not Make Sense
Long-Term Equity Investors
For long-term equity investors with a 10-year or longer horizon, the evidence for hedging is mixed. Over long periods, currency movements tend to mean-revert — the short-term volatility is real, but the long-run impact on total returns is typically modest compared to the compounding cost of paying 1–2% per year for hedging.
Research by Vanguard and others suggests that for very long-term buy-and-hold equity investors, the cost of hedging tends to outweigh the volatility reduction benefit over complete market cycles. The exception is in markets with persistent interest rate differentials that maintain high hedging costs.
When Hedging Costs Are High
When the interest rate differential between currencies is large, hedging is expensive. A UK investor hedging EUR exposure (where ECB rates are below Bank of England rates) might currently pay 0.5–1.0% per year. Hedging JPY exposure (where Bank of Japan rates, though rising, remain well below US rates) can still cost a USD-based investor several per cent per year.
A 4% annual hedging cost is a significant drag on long-term equity returns. It might be justified for bond holdings where currency risk is proportionally large, but for equity investments where returns are expected to be 5–9% annually, paying 4% for hedging consumes a very large share of expected returns.
Investors Who Are Already Currency Diversified
If you hold assets in multiple currencies — GBP for UK expenses, USD for US travel, EUR for European property — your overall currency position is already diversified. Adding hedging may reduce diversification rather than adding to it.
Emerging Market Equities
Currency-hedging emerging market equity ETFs is generally not advisable. Emerging market currencies often move for fundamental economic reasons closely tied to the equity market itself. Hedging away the currency removes part of the economic signal the market price is expressing. Hedging costs for some emerging market currencies are also prohibitive (Brazilian real, Indian rupee hedging is expensive), and forward currency markets may be illiquid.
The Mechanics of Hedging: Imperfect Protection
Currency hedging via forward contracts is imperfect for several reasons:
Rebalancing lag: Hedges are typically rolled monthly. Between roll dates, market movements in the underlying equities change the size of the position, creating a temporary mismatch between the hedge and the portfolio value.
Transaction costs: Rolling forward contracts has a cost beyond the interest rate differential. For large, liquid ETFs this is minimal; for smaller or less liquid funds, it can add up.
Residual tracking error: The combination of rolling cost, rebalancing lag, and bid-ask spreads on forward contracts means hedged ETFs have slightly higher tracking error than their unhedged equivalents.
Cross-hedging: A GBP-hedged global equity ETF hedges all non-GBP currencies back to GBP. But a global equity portfolio contains USD, EUR, JPY, CHF, and other currencies in varying proportions. Rolling all of them monthly creates complexity and multiple layers of cost.
A Practical Framework for International Investors
For internationally mobile investors, the currency question is more complex because their "base currency" may change over time — living in Dubai with GBP expenses becoming EUR expenses after a move to Spain.
A practical framework:
For bonds: Hedge to the currency of your primary ongoing expenses (your functional currency). If you spend in GBP, hold GBP-hedged global bonds.
For equities (10+ year horizon): Consider accepting currency risk as part of a diversified global portfolio. The diversification benefits of holding multiple currencies may outweigh the cost of hedging.
For equities (3–7 year horizon): Partial hedging — perhaps hedging 50% of the currency exposure — can reduce volatility without paying the full cost of complete hedging.
When your base currency is unclear: If you genuinely do not know where you will retire or what currency your major expenses will be in, holding a mix of hedged and unhedged equity exposure provides flexibility.
Review periodically: Interest rate differentials change, as does the cost of hedging. A strategy that made sense with near-zero interest rate differentials may need revisiting as rates shift.
Compliance Caveats
All investments can fall in value as well as rise. Currency movements can amplify or reduce investment returns. Currency hedging reduces, but does not eliminate, risk. The cost of hedging can vary significantly over time and may erode investment returns. This article is for informational purposes and does not constitute personal financial advice. The appropriate hedging strategy depends on your individual circumstances, investment horizon, and currency obligations.
How Global Investments Can Help
At Global Investments, we consider currency dynamics carefully when constructing portfolios for internationally mobile clients. Whether you need to hedge bond exposure, manage a multi-currency asset base, or think about which currency your retirement will ultimately be denominated in, our advisers can provide a structured framework. Contact us to arrange a consultation.
This article is for general information only and does not constitute financial, legal or tax advice. Rules, prices and regulations change; verify current requirements with a qualified adviser before acting.