Currency Risk for a Swiss Investor: What Hedging Does and What It Costs

Key Takeaways

Two bets in one: when a Swiss investor buys a foreign asset, the return in francs is the asset's return plus the move in the foreign currency against the franc. Every unhedged foreign holding is, quietly, also a currency position.
The franc's twist: the Swiss franc has tended, over the long run, to be a strong currency, and it tends to appreciate in crises. For a Swiss investor that means foreign losses and a rising franc often arrive together – a double blow exactly when it hurts.
What hedging does: a currency hedge sells the foreign currency forward, locking in a future exchange rate. It removes the currency swing in both directions – giving up the upside as well as the downside – leaving only the underlying asset's return.
The economics of hedging: a hedge's carry – the forward points – is roughly the short-term interest-rate differential between the two currencies. But under interest-rate parity a higher-yielding currency is expected to depreciate by about the same amount, so hedging is close to return-neutral in expectation: it mainly removes volatility, not expected return.
Bonds versus equities: for foreign bonds, currency swings usually dwarf the bond's own return, so hedging is close to standard practice. For foreign equities, currency is a smaller share of total risk, and whether to hedge is a genuine judgment call.
Key reflex: decide the currency exposure on purpose, not by accident. Separate the asset decision from the currency decision, and size any hedge to the risk it removes rather than a return it will earn.

Introduction

A Swiss investor buys a fund of US equities. Over the year, those equities rise 8% in dollars – a good result. Yet the investor's account, measured in francs, shows far less, because over the same year the dollar fell against the franc. The asset did its job; the currency undid part of it. Had the investor bought a foreign bond instead, the currency move could easily have swamped the entire interest earned.

This is the quiet second bet inside every foreign investment. Buying an asset priced in another currency means holding two positions at once: the asset itself, and the foreign currency it is denominated in. For a Swiss investor the point is sharper than for most, because the franc is not an ordinary currency – it has been, over decades, a structurally strong one, and it has a habit of rising precisely when markets fall.

This article separates the asset bet from the currency bet, explains what a hedge does and what it costs, and looks at why the answer differs for bonds and equities. The mechanics are general and timeless; the Swiss angle is what makes them concrete. It builds on our article on what risk actually means – currency risk is a textbook case of a risk that can be temporary noise or a permanent drag depending on the holding – and on our article on diversification, since foreign currency is itself a diversifying exposure with a cost.

Two Returns in One

The return a Swiss investor actually earns on a foreign asset has two parts that multiply together: the asset's return in its own currency, and the change in that currency against the franc. Roughly, the return in francs is the sum of the two.

If a US asset returns +8% in dollars and the dollar falls 5% against the franc, the Swiss investor keeps only about +2.6% in francs. If instead the dollar had risen 5%, the same asset would have delivered around +13.4%. The asset was identical in both cases; the currency alone opened an eleven-point gap. This is why two Swiss investors can hold the very same foreign fund and record very different results: they made the same asset bet but were, without necessarily intending it, running different currency bets alongside it.

The size of that currency bet is not small. Major exchange rates commonly swing on the order of eight to twelve percent a year – well above the volatility of high-quality bonds, and a large fraction of the volatility of equities, which runs closer to fifteen to twenty percent. For a bond earning low single digits, the currency is the dominant source of risk; for an equity, it is a meaningful minority of it. Either way, the currency is not a rounding error to be ignored.

The Franc's Special Problem

For most investors, foreign-currency exposure is roughly a wash over the long run – currencies fluctuate around fair value and the noise partly averages out. The Swiss franc has behaved differently in two ways that matter.

First, it has tended, over the long run, to appreciate against most currencies – the mark of a low-inflation, high-surplus economy. A rising home currency is a persistent headwind on unhedged foreign holdings: even a foreign asset that does well in its own currency can translate into a mediocre result in francs. Second, and more sharply, the franc is a safe-haven currency: in periods of market stress, capital flows toward it and it strengthens. That timing is the problem. When global equities fall, the franc tends to rise, so a Swiss investor's unhedged foreign losses are amplified in francs at the worst possible moment. The currency that should cushion the fall instead deepens it. This is the specific reason currency risk deserves deliberate attention from a Swiss base rather than the shrug it can afford elsewhere.

What a Hedge Is, and What It Costs

Hedging currency risk means neutralizing the foreign-currency position while keeping the asset. In practice it is done by selling the foreign currency forward: the investor agrees today to convert the future foreign proceeds back into francs at a rate fixed now. Whatever the exchange rate does in the meantime, the conversion rate is locked. The currency swing – in both directions – is removed, and what remains is the asset's own return.

The hedge has a price, and it follows directly from covered interest parity: the forward exchange rate must reflect the interest-rate difference between the two currencies, or arbitrage would be possible. The practical consequence is that a continuously rolled hedge earns the home short-term rate and gives up the foreign one – its carry is roughly the interest-rate differential. For a Swiss investor, whose home rate has usually been among the lowest in the developed world, hedging a higher-yielding foreign currency does mean giving up that yield pickup on the currency overlay.

But this is not a dead-weight cost, and here the intuition misleads. Under interest-rate parity, a higher-yielding currency is expected to depreciate against the franc by roughly that same differential – so the yield the hedger forgoes is the yield the unhedged investor is expected to lose back through depreciation. In expectation the two roughly cancel: hedging is close to return-neutral, exchanging currency volatility for the certainty of the home rate rather than systematically raising or lowering return. Whether it helps or hurts in any given year depends on how the currency actually moves relative to the forward rate. This is why the classic study on the question calls currency hedging a near-"free lunch": it cuts risk without a clear cost to long-run expected return.

The Same Asset, Hedged and Unhedged

The trade-off is clearest in a single scenario: a US asset returning 8% in dollars, the dollar falling 5% against the franc, with an illustrative forward-points carry of about 1.5% (a stand-in for the rate differential given up on the overlay).

Component	Return
Asset return (in USD)	+8.0%
Currency move (USD vs CHF)	−5.0%
Unhedged return (in CHF)	+2.6%
Hedged return (in CHF, less the ~1.5% forward-points carry)	+6.4%

Here the hedge clearly helped: it converted a currency-battered +2.6% into +6.4%. But the table would tell the opposite story in a year the dollar rose – the hedge would have stripped away that gain, leaving the same +6.4% while the unhedged investor pocketed +13.4%. That symmetry is the whole point about hedging: it does not improve the expected currency outcome, it removes the currency outcome, upside and downside alike, in exchange for the certainty of the home rate. Hedging buys lower volatility and predictability, not higher returns.

What to Hedge, and What Not To

Because currency risk is a different fraction of total risk for different assets, the sensible policy differs too.

Foreign bonds are usually hedged. A high-quality bond might yield low single digits with modest volatility, while the currency swings eight to twelve percent a year. Left unhedged, such a bond is mostly a currency bet wearing a fixed-income label. Hedging strips the currency noise and lets the bond be a bond – which is why hedging foreign bonds back to the base currency is close to standard institutional practice.
Foreign equities are a judgment call. Currency is a smaller share of an equity's total risk, hedging costs money and cash flow to maintain, and foreign-currency exposure adds some diversification. Some argue for hedging equities too, to avoid the franc's safe-haven double blow; others leave equity currency exposure unhedged over long horizons and accept the noise. Both are defensible; what is not defensible is holding the exposure by accident and calling the result an asset decision.

The point is not that one policy is correct for everyone – that would depend on circumstances this article cannot and should not judge. The point is that the currency decision is separate from the asset decision, and deserves to be made as deliberately, weighing what a hedge removes against what it costs.

In Practice

Three reflexes keep the currency bet under control.

Decompose the return. For any foreign holding, look at the asset return and the currency move separately. If most of the result came from the currency, you were running a currency position, whatever the label on the fund said.
Match the hedge to the asset. Currency swings overwhelm bond returns and merely dent equity returns; a hedging policy that treats the two alike is ignoring where the risk actually is.
Weigh the hedge before placing it. A hedge's carry is roughly the interest-rate differential, and it removes the upside as well as the downside – but in expectation it is close to return-neutral, so treat it as a way to cut volatility, not as a premium paid or a route to higher returns. Size it to the risk you actually want to remove.

Conclusion

Every foreign investment made from a Swiss base carries two returns bundled into one: the asset's, and the franc's move against the currency it is priced in. For most of the world the second is background noise; for the franc, a strong and safe-haven currency, it is a persistent headwind that turns hostile in exactly the crises when foreign assets are already falling. Ignoring it does not make the bet go away – it just makes it an accidental one.

Hedging is the tool that separates the two bets. It removes the currency swing in both directions – its carry roughly the interest-rate differential, its expected effect on return close to neutral – buying lower volatility rather than performance. Used well, it is applied where the currency dominates the risk – foreign bonds above all – and considered deliberately where it does not. The discipline is simple to state and easy to neglect: decide the currency exposure on purpose, price what a hedge costs against what it removes, and never let the second bet be one you did not know you had made.