Currency Hedging in Global Portfolios

Managing Currency Exposure in International Portfolios

For investors with global allocations, foreign exchange movements can significantly impact portfolio returns. Understanding when and how to hedge currency exposure is an important consideration in portfolio construction.

The Nature of Currency Risk

How Currency Exposure Arises

International investments create automatic currency exposure:

• Purchasing foreign assets requires converting to local currency
• Returns are earned in local currency terms
• Converting back to home currency introduces FX gains or losses
• Currency movements can overwhelm underlying asset returns

Magnitude of Impact

Currency effects can be substantial:

• Major currency pairs can move 10-20% in a single year
• Over shorter periods, volatility can be even more extreme
• Currency losses can offset strong local market returns
• Currency gains can enhance otherwise modest returns

Arguments for Hedging

Reducing Volatility

Hedging typically reduces overall portfolio volatility:

• Removes an additional source of return variation
• Allows clearer assessment of underlying investment merit
• May improve risk-adjusted returns
• Provides more predictable outcomes

When Hedging Makes Sense

Situations favouring currency hedging:

• Fixed income investments where yields are modest relative to FX volatility
• Shorter investment horizons where mean reversion has less time to work
• Concentrated currency exposures that dominate portfolio risk
• Specific liability matching requirements in home currency

Arguments Against Hedging

Diversification Benefits

Unhedged currency exposure may provide portfolio benefits:

• Currencies often move inversely to local equity markets
• During crises, developed market currencies often strengthen
• Long-term currency movements may reflect economic fundamentals
• Over very long horizons, currencies may mean-revert

Cost Considerations

Hedging involves direct and indirect costs:

• Forward contract costs based on interest rate differentials
• Transaction costs for implementing and rolling hedges
• Opportunity costs if unhedged returns would have been higher
• Complexity and operational requirements

Strategic Approaches

Full Hedging

Eliminating all currency exposure:

• Provides purest exposure to underlying assets
• Highest certainty but also highest cost
• May sacrifice diversification benefits
• Most appropriate for fixed income

Partial Hedging

Hedging a portion of currency exposure:

• Balances volatility reduction with diversification
• Common approach: hedge 50% of foreign exposure
• Reduces regret from extreme outcomes either way
• Lower cost than full hedging

Strategic or Selective Hedging

Tailoring hedge ratios by currency or asset class:

• Hedge fixed income more heavily than equities
• Hedge volatile emerging market currencies more than stable developed currencies
• Adjust based on valuation signals if currency views are incorporated
• Requires more active management

Implementation Considerations

Hedging Instruments

Common tools for currency hedging:

• Forward contracts: most common for institutional portfolios
• Currency ETFs and futures: accessible for individual investors
• Options: provide asymmetric protection but at higher cost
• Currency-hedged share classes: convenience for fund investors

Practical Challenges

• Matching hedge tenor to investment horizon
• Managing hedge ratio as portfolio values change
• Coordinating across multiple currencies
• Balancing precision against operational complexity

A Pragmatic Framework

For most investors, a balanced approach works well:

Fully hedge foreign fixed income exposures

Partially hedge foreign equity exposures (25-50%)

Accept unhedged exposure to diversifying currencies

Review periodically but avoid tactical currency speculation

Conclusion

Currency hedging involves trade-offs between volatility reduction, diversification benefits, and costs. There is no universally optimal approach—the right answer depends on investment horizon, risk tolerance, and portfolio composition. A considered, consistent policy is more important than finding the theoretically perfect hedge ratio.