Currency Overlay Strategies for Global Investors
Buy a fund of European or Japanese stocks and you've quietly made a second bet on the euro or yen. A currency overlay lets you keep the stock exposure and decide separately what to do about the currency.
Don't have time? Here's what you need to know:
- 1Every unhedged foreign fund is two bets at once: the foreign assets and the foreign currency against the dollar.
- 2Hedging removes currency volatility but also removes the tailwind from a falling dollar, and it carries a cost from forwards and higher fees.
- 3The case for hedging is strongest for bonds, where currency swings can overwhelm the yield, which is why BNDX hedges by design.
- 4Many long-term investors hedge international bonds and leave international stocks like VXUS unhedged for the diversification benefit.
Hedged vs Unhedged ETFs: What You Are Actually Choosing
Most broad international funds available to U.S. investors, including VXUS, VEA, and IEFA, are unhedged. You get the local stock return plus or minus the currency move. Currency-hedged share classes use rolling forward contracts to strip out the currency component, so your return tracks the foreign stocks in dollar terms regardless of what the exchange rate does.
Neither is automatically better. Hedging removes a source of volatility and, importantly, removes the chance that a strengthening dollar erases years of foreign equity gains. Leaving exposure unhedged gives you diversification, because a falling dollar boosts your foreign holdings, and it avoids the modest ongoing cost of running the hedge. The right answer depends on your time horizon and on what you expect the dollar to do, which is itself notoriously hard to forecast.
| Unhedged international ETF | Currency-hedged international ETF | |
|---|---|---|
| Return drivers | Foreign stocks + currency move | Foreign stocks only (in USD terms) |
| If the dollar strengthens | Hurts your return | Largely protected |
| If the dollar weakens | Boosts your return | You miss the tailwind |
| Volatility | Higher (two sources) | Lower (currency stripped out) |
| Ongoing cost | Lower | Hedging cost + higher expense ratio |
| Examples | VXUS, VEA, IEFA | Currency-hedged share classes |
Hedging Is Not Free: The Carry Cost
Currency hedges are built from forward contracts, and the cost or benefit of rolling them depends on the interest-rate gap between the two countries. When U.S. short-term rates are higher than the foreign country's, a U.S. investor hedging that currency actually earns a small positive carry. When U.S. rates are lower, hedging costs money every time the contract rolls. This carry can swing from a tailwind to a headwind as central bank policies diverge.
On top of carry, hedged ETF share classes typically charge a higher expense ratio than their unhedged siblings to cover the operational work. None of this is large in any single year, but over a long holding period the drag from persistent negative carry plus higher fees can quietly offset the volatility reduction you were paying for.
Important: Hedging eliminates the currency tailwind as well as the headwind. If you hedge and the dollar then falls for a decade, you give up a meaningful boost that an unhedged investor would have captured.
Ready to invest? Open an IBKR account in 10 minutes and get free stock. $0 commissions on US ETFs • Fractional shares from $1 • 150+ global markets.
Why Bonds Are the Stronger Case for Hedging
The case for hedging is much stronger for international bonds than for international stocks. The whole point of holding bonds is stability, but unhedged foreign currency exposure can swamp the modest yield a foreign bond pays, turning a supposedly low-volatility asset into something almost as jumpy as equities. That is why a fund like BNDX hedges its currency exposure back to the dollar by design.
For equities the calculus is different. Stock returns are volatile enough on their own that currency moves are a smaller share of the total, and over long horizons currency swings have historically tended to wash out. Many long-term equity investors therefore leave international stocks unhedged for the diversification and accept the extra volatility, while hedging the bond sleeve where currency noise does the most damage.
Tip: A common compromise: hedge international bonds (as BNDX already does), but leave international stocks like VXUS unhedged. You quiet the volatility where it matters most and keep the diversification where it pays off.
Frequently Asked Questions
What is a currency overlay in plain terms?
It is a way to manage the currency exposure that comes bundled with foreign investments, separately from the investments themselves. Using forward contracts laid 'over' the portfolio, an overlay can neutralize (hedge) or adjust currency risk without selling the underlying stocks or bonds. For most retail investors the overlay choice is made simply by picking a hedged or unhedged version of an ETF.
Should I buy hedged or unhedged international ETFs?
For long-term stock holdings, many investors leave currency unhedged because it adds diversification and currency swings have historically tended to even out over long horizons. For bonds, hedging usually makes more sense because currency moves can overwhelm the modest yield. There is no universally correct answer; it depends on your horizon and your view on the dollar, which is hard to predict.
Does hedging cost money?
Yes, in two ways. Hedged ETF share classes generally carry a higher expense ratio, and the forward contracts that do the hedging have a carry cost that depends on the interest-rate difference between the two countries. When U.S. rates are higher, hedging can earn a small positive carry; when they are lower, it costs money on each roll.
Why is BNDX hedged but VXUS isn't?
BNDX holds international bonds, where unhedged currency swings can easily dwarf the bond yield and defeat the purpose of owning a stable asset, so it hedges by design. VXUS holds international stocks, which are volatile enough that currency is a smaller part of total return, and many long-term investors prefer the diversification of leaving it unhedged.
Further Reading
Free Tools
Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.