A foreign stock’s return in your home currency depends on both the stock’s local-market performance and the foreign currency’s movement against your home currency. For a U.S. investor, a weaker foreign currency can reduce or erase local stock gains; a stronger one can add to them. Currency shifts can also affect a company’s business and share price, so the two effects are related but not identical.
How currency translation changes your return
When you invest in a stock priced in another currency, its local-market return is only part of the result. The value of that investment must also be translated back into the currency in which you measure your wealth. The SEC explains that an exchange-rate change can increase or reduce an international investment’s return (Investor.gov: International Investing).
The exact compounded-return formula is:
Home-currency return = (1 + local stock return) × (1 + foreign-currency return) − 1
Here, “foreign-currency return” means the change in the foreign currency’s value measured in your home currency. For a U.S. investor, it is the change in how many U.S. dollars that foreign currency is worth. Naming both currencies avoids ambiguity: saying “the exchange rate rose” is not enough, because the direction depends on which currency the quote measures.
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Hypothetical example for a U.S. investor
Suppose a foreign stock rises 10% in its local market while that market’s currency loses 5% of its value against the U.S. dollar. The translated result is (1.10 × 0.95) − 1 = 4.5%, before fees, taxes, or tracking differences. If instead the foreign currency gains 5% against the dollar, the result is (1.10 × 1.05) − 1 = 15.5%. These are arithmetic illustrations, not historical performance or forecasts.
Adding the two percentages gives a rough approximation, but it omits the product of the returns. That difference matters more as either movement grows; the full calculation includes the stock return, currency return, and their product (S&P Dow Jones Indices, 2020).
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Why currency and stock prices can move together
Translation is a separate accounting effect from what happens to a company’s business. Currency movements can also change the value of overseas sales, imported inputs, foreign-currency debt, and a company’s competitive position. Investors’ risk appetite may shift at the same time. Those channels can affect the share price before the investment is translated into your home currency.
A Federal Reserve Board discussion paper reports that, in its studied sample, a 1% appreciation of the dollar was associated with a 0.13% decrease in the average industry’s return. That is a sample-specific estimate, not a rule for every market or a current forecast (Federal Reserve Board).
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A 2022 study in Oxford Open Economics also finds an association between a weaker broad dollar and higher local-currency stock returns in the markets and periods it examined. The authors discuss the dollar as a global factor consistent with a financial channel; the finding does not mean every foreign market rises whenever the dollar falls (Oxford Open Economics, “Dollar beta and stock returns”).
What currency hedging changes—and what it does not
A currency hedge uses financial positions to offset some or all of a portfolio’s exchange-rate exposure. A fund can hedge at the portfolio level; investors may also choose a hedged share class or use a separate overlay. Professional tools include forwards, options, and FX swaps. The objective is to change currency exposure, not to guarantee a better return or eliminate equity-market risk. The CFA Institute’s 2026 educational reading notes that currency can materially affect investment returns and risks, particularly over short and medium periods (CFA Institute, “Currency Management: An Introduction”).
Unhedged, partially hedged, and fully hedged investments differ in how much currency movement remains. “Hedged” does not mean perfectly or costlessly protected: implementation, fees, hedge frequency, roll effects, and tracking differences matter. A fund’s prospectus and hedging methodology are the place to check its actual approach.
- Exposure target: Determine how much currency movement the strategy seeks to offset.
- Risk objective: Decide whether reducing home-currency volatility matters more than retaining currency exposure as part of diversification.
- Horizon and spending currency: Consider the currency in which you expect to spend or meet future liabilities; the effect can vary with the time horizon.
- Portfolio composition: Countries, industries, and companies have different currency exposures and sensitivities.
Historical studies do not point to one universally superior choice. An IMF working paper examining German, Japanese, British, and U.S. investor perspectives over 1975–2009 reports that hedging substantially reduced foreign-investment volatility at a quarterly horizon, with risk reduction remaining relevant at horizons up to five years. It also finds economically meaningful return effects in some cases; the paper’s author’s views are not necessarily IMF policy (IMF Working Paper 10/151, 2010).
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A separate INSEAD working-paper summary, “Currency Risk Hedging: No Free Lunch,” reports that in its out-of-sample analysis hedging lowered volatility but also lowered average returns; Sharpe ratios often deteriorated, and skewness and tail characteristics changed. This is a finding from that analysis, not a universal outcome for every investor or period (INSEAD).
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Other risks beyond exchange-rate moves
Currency is one source of uncertainty, not the only one. A foreign investment remains exposed to share-price changes and country-specific conditions. The SEC also warns that some countries impose currency controls that can restrict or delay moving capital, affecting liquidity or value (SEC Investor Bulletin).
Historical evidence should be read in context. For example, an IMF working paper published in 2006 examined 33 industry portfolios across seven major stock markets and reported that exchange-rate risk was priced in many markets, with variation by currency-specific shocks. It does not establish a current currency risk premium or a universal effect (IMF Working Paper 06/194).
How to assess the currency effect on an investment
- Identify your reporting currency. The relevant comparison is between the currency in which you measure wealth and the currency in which the investment’s return is reported.
- Separate the two return components. Find the local-currency stock return and the foreign currency’s change in value against your reporting currency.
- Combine them multiplicatively. Use (1 + stock return) × (1 + currency return) − 1 rather than treating the percentages as exact simple additions.
- Check for operating exposure. A company’s revenues, costs, debt, and competitive position may respond to currency changes, affecting its share price as well as the translated value.
- If comparing hedged options, read the fund documents. Check the intended hedge level, implementation, fees, and tracking approach rather than relying on the word “hedged” alone.
There is no current exchange-rate forecast, universally appropriate hedge ratio, or best fund established by the evidence cited here. Tax treatment, fees, and product terms depend on the specific investment and investor, so check current fund documents and consult a qualified tax or financial professional where appropriate.
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