Currency risk is an often overlooked but highly consequential driver of portfolio outcomes. For globally diversified investors, foreign exchange (FX) exposure is often a byproduct of investing abroad. But the decision to hedge it, partially or fully, is far from straightforward 鈥 particularly for those investors based in relatively low-yielding markets like Europe or Japan.

When building robust, globally diversified portfolios, strategic currency hedging is a key consideration that requires a nuanced, data-driven approach. Getting it right means balancing risk, return and diversification potential across multiple asset classes and market regimes. Like other core elements of strategic asset allocation (SAA), it is a foundational choice that can meaningfully shape portfolio outcomes over time.

Currency hedging is more about risk than return

Currencies are notoriously hard to forecast, and over the long term, their expected return is close to zero.1聽So, the purpose of a strategic hedging policy isn鈥檛 to generate alpha from currency views, it鈥檚 to reduce unintended risks in the portfolio and improve overall efficiency.

But reducing risk isn鈥檛 as simple as eliminating FX exposure. In fact, a fully hedged approach can sometimes increase overall portfolio volatility or dilute important diversification benefits. The optimal hedge ratio is rarely 0% or 100%. Instead, a thoughtful balance of asset class characteristics, correlation patterns, hedging costs and broader investment goals should be considered.

The right FX strategy hedging policy depends on what you鈥檙e investing in:

  • For lower-risk assets like fixed income, currency swings can dominate the volatility profile. Hedging FX exposure on bonds often works because the underlying asset returns are relatively stable 鈥 and FX fluctuations can introduce unwanted noise. This is not a hard rule, however, depending on the end portfolio objectives and liabilities, holding some foreign currency may be beneficial.
  • For higher-volatility assets like global equities, the story is different. FX tends to play a smaller role in total risk, and in some cases, foreign currency exposure can actually reduce risk. Currencies like the US dollar, Japanese yen, or Swiss franc often move in the opposite direction of equity markets during periods of stress. That means they can act as shock absorbers when volatility rises 鈥 offering natural diversification.

The critical question, therefore, is not whether currency risk matters, but what the optimal approach of managing it is?

Find out how the Partnership Solutions team is thinking about this question:

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