Currency Overlay: What It Is, How It Works

Currency overlay is a strategy that fund managers and institutions use to manage currency risk independently from their main investment decisions. In this article, we’ll explore what is currency overlay, how it works, the difference between active and passive approaches, and who uses it.

What Is Currency Overlay?

A currency overlay is a specialized risk management approach where the responsibility for handling currency exposure is separated from core investment management. Rather than having the portfolio manager handle both stock/bond selection and currency hedging, a separate overlay manager is tasked solely with managing the portfolio’s currency risks.

The main purpose is to treat currency risk as a standalone factor, so it can be addressed systematically. This is especially important for international portfolios that deal with multiple foreign currencies, each of which can influence returns in unpredictable ways.

For example, if a UK-based pension fund invests in U.S. equities, it will earn returns in U.S. dollars. But when those returns are converted back to British pounds, fluctuations in the USD/GBP exchange rate could significantly affect performance. A currency overlay strategy helps control that variable without changing the actual stock holdings.

How Currency Overlay Works

At its core, a currency overlay strategy involves measuring the portfolio’s currency exposure and using hedging instruments to offset unwanted risks.

Here’s a simplified breakdown of the process:

1. Measure Exposure – The overlay manager calculates how much of the portfolio is exposed to different currencies. This could be a currency basket containing multiple exchange rates.
2. Set Hedge Ratios – A hedge ratio (e.g., 50% or 100%) determines how much of the exposure will be covered.
3. Execute Hedges – Using derivatives like forwards or options, the manager locks in future exchange rates to reduce risk.
4. Adjust as Needed – Depending on the strategy, the overlay may remain static or be actively adjusted based on market forecasts.

The key advantage is that currency risk is managed separately, allowing asset managers to focus solely on picking the best investments.

Types of Currency Overlay Strategies

Currency overlay strategies generally fall into two categories: passive and active.

Passive Currency Overlay

A passive currency overlay is rules-based and typically aims to maintain a fixed hedge ratio, regardless of market conditions. For example, a fund might decide to hedge 100% of its currency exposure at all times or maintain a steady 50% hedge.

The benefits include simplicity, predictability, and reduced active risk. Costs are also relatively lower since fewer trading decisions are made. However, the downside is that it may miss opportunities when markets shift in favorable directions.

Active Currency Overlay

An active currency overlay takes a more dynamic approach. Managers actively adjust hedge ratios based on forecasts, economic indicators, or technical analysis. If they expect a foreign currency to strengthen, they might reduce the hedge to benefit from potential gains. Conversely, if they anticipate weakness, they might increase the hedge.

The appeal of active strategies lies in the potential to generate alpha by making correct calls on currency movements. However, this comes with higher risk, increased transaction costs, and greater dependence on manager skill or sophisticated models.

Benefits of Using Currency Overlay

Implementing a currency overlay program can offer several advantages:

• Reduced Foreign Exchange Risk: Protects global investments from adverse currency moves.
• Better Control Over Portfolio Volatility: Smooths out returns and avoids large swings caused by exchange rate fluctuations.
• Flexibility: Allows outsourcing currency management to specialists, freeing up internal resources.
• Potential Return Enhancement: In active overlays, skilled managers can add extra performance through strategic positioning.

Risks and Considerations

While beneficial, currency overlay is not without drawbacks:

• Costs: Overlay strategies incur management fees and hedging transaction costs.
• Forecast Risk: In active overlays, incorrect predictions can lead to losses.
• Operational Complexity: Managing multiple currency exposures and derivative contracts requires strong infrastructure.
• Counterparty & Liquidity Risk: Derivative contracts depend on counterparties who must meet their obligations.

Who Uses Currency Overlay and Why

Currency overlay is most common among large, globally diversified investors:

• Institutional Investors – Pension funds and sovereign wealth funds often have exposure to dozens of currencies and want a centralized approach to managing FX risk.
• Global Mutual Funds or ETFs – Fund managers can offer hedged and unhedged share classes to cater to different investor preferences.
• Corporations – Multinational companies use overlay strategies to manage treasury operations across multiple regions.

Currency Overlay vs. Traditional Hedging

Traditional currency hedging is often handled internally by the portfolio manager or treasury team on an ad hoc basis. It may not be systematically measured or reported as a separate performance component.

Currency overlay, in contrast, is a standalone systematic process with its own managers, benchmarks, and cost tracking. This clear separation makes it easier to measure effectiveness and adjust the approach without interfering with core investment strategies.

Real-World Examples of Currency Overlay

Here are a few ways currency overlay is used in practice:

1. Pension Fund – A European pension fund invests heavily in U.S. and Japanese markets. To protect returns from EUR/USD and EUR/JPY fluctuations, it hires a specialist overlay manager to maintain a 75% hedge on both exposures.
2. Global Bond Fund – A fund with holdings in multiple countries uses a passive overlay to keep a 50% hedge ratio, regardless of market sentiment.
3. Active Strategy – An overlay manager expects the U.S. dollar to strengthen based on employment and inflation data, so they increase USD exposure by reducing hedges against it..

How to Implement a Currency Overlay Program

Setting up a currency overlay program involves several key steps:

1. Assess Currency Exposure: Identify how much of the portfolio is exposed to each currency.
2. Define Objectives: Decide whether the goal is to reduce volatility, enhance returns, or both.
3. Choose Strategy Type: Select between passive or active overlay based on risk tolerance and market view.
4. Select Instruments: Decide which hedging tools (forwards, futures, options) are most appropriate.
5. Pick Counterparties: Choose reliable financial institutions for derivative contracts.
6. Monitor & Report: Track performance separately from core assets to evaluate the overlay’s effectiveness.

Currency overlay is a practical tool that helps investors and companies navigate the unpredictable world of foreign exchange. It provides a structured way to address currency risk without distracting from the main investment focus.

In a world where investing is increasingly common and tools like peer to peer currency exchange and every foreign exchange service are more accessible than ever, professional currency management has become a vital skill. Done well, currency overlay can protect returns, reduce volatility, and even open the door to new profit opportunities.

Frequently Asked Questions (FAQs)

What is currency overlay used for?

It’s used to manage currency risk in international investment portfolios without changing the underlying assets.

Is currency overlay only for large institutions?

While mostly used by institutions, some large mutual funds and advanced private investors also apply it.

What’s the difference between active and passive currency overlay?

Passive overlay follows a fixed rule; active overlay relies on forecasts and manager discretion.

Does currency overlay eliminate FX risk completely?

No, it reduces or controls risk, but cannot eliminate it, especially in active approaches.

Can currency overlay increase returns?

Active overlays may improve returns, but results depend on accurate predictions and execution.

References

Marquette Associates. (2010). Understanding currency overlay [PDF]. Marquette Associates. https://www.marquetteassociates.com/wp-content/uploads/2017/02/CurrencyOverlayFINAL.pdf 

Mesirow Currency Management. (2024). Currency for institutional investors [PDF]. Mesirow. https://www.mesirow.com/sites/default/files/PDFs/Currency/Currency-for-Institutional-Investors.pdf CFA Institute. (2022). Guidance statement on overlay strategies [PDF]. CFA Institute. https://www.gipsstandards.org/wp-content/uploads/2022/01/gs_overlay_2022.pdf