Currency exposure as a portfolio decision, not a trade
Most investors hold currency risk without ever having chosen to. It arrives as a by-product of where assets are listed.
Key takeaways
- Unhedged foreign assets contain two decisions; only one is usually intentional.
- The right hedge ratio depends on the currency of future liabilities, not on a forecast.
- Hedging is a cost-and-cashflow commitment, not a free reduction of risk.
When an investor buys a foreign-listed asset they take two positions: one in the asset, one in the currency it is denominated in. The first is deliberate and researched. The second is frequently inherited, unsized and unreviewed — and over long horizons it can dominate the outcome measured in the investor's own spending currency.
Start from liabilities, not views
The relevant question is not where a currency pair is headed. It is which currency the investor's future obligations are denominated in — school fees, property, retirement spending, business costs. Currency risk is the mismatch between the denomination of assets and the denomination of intended use. Framed that way, the hedging decision becomes an accounting exercise before it becomes a market one.
- Map obligations by currency and horizon, separating committed spending from discretionary.
- Measure the existing mismatch across the whole balance sheet, including property and business interests.
- Choose a policy hedge ratio for that mismatch, and treat deviations from it as explicit, sized decisions.
- Account for the carry, margin and operational cost of maintaining hedges before committing to a ratio.
Why timing FX rarely helps a portfolio
Currencies are relative prices set by policy, flows and expectations simultaneously; they can trend for years and reverse without a change in fundamentals. Layering a discretionary currency view on top of an equity or credit portfolio typically adds volatility that is uncorrelated to the investor's edge and correlated to their attention.
A currency position taken to improve returns is a second portfolio. It should be judged as one.
Hedging has a bill
A hedge does not remove risk; it exchanges one exposure for another, and charges a running cost determined by the interest rate differential. It also creates cashflow obligations: hedges lose money precisely when the hedged asset gains, and those losses settle in cash. Any hedging policy must therefore be paired with a liquidity reserve sized to fund it through an adverse move.
A workable default
For investors whose spending is concentrated in one currency, a substantial policy hedge on defensive assets and a lighter hedge on long-horizon growth assets is a defensible starting point — the former exist to be spent, the latter to compound. The specific ratios matter less than the fact that they were chosen, documented and reviewed on a schedule rather than during a move.