Currency Risk in International Investing: What It Means and How to Manage It

Most ETF providers offer both hedged and unhedged versions of major index funds. For example, iShares offers CSPX (unhedged S&P 500, in USD) and IGUS (GBP-hedged S&P 500). The hedged version typically costs 0.05–0.15% more per year in expense ratio, and the hedging itself has a cost related to the interest rate differential between the two currencies.

Academic evidence suggests that for long-term investors (10+ year horizon), currency risk tends to diversify away and hedging the equity exposure in developed-market portfolios adds more cost than it saves. For shorter horizons or portfolios where currency volatility materially affects spending needs, hedged products are worth considering.

To make currency risk concrete, here are real historical scenarios for GBP-based investors in US equity:

• 2007–2008 (GBP/USD: 2.10 → 1.40): sterling fell 33% against USD. A UK investor in S&P 500 saw the index fall 50% in USD terms but 'only' ~33% in GBP terms — currency risk actually softened the blow in this case.
• 2014–2016 (GBP/USD: 1.71 → 1.22): sterling fell 28% post-Brexit referendum. UK investors holding unhedged US equities received a 28% windfall return in GBP on top of USD equity returns.
• 2022 (USD strengthening): USD strengthened against most currencies. UK investors in unhedged US equities saw GBP returns approximately 14% higher than USD returns.
• The pattern: currency risk is unpredictable, but over long periods tends to fluctuate around a range. Short-term hedging locks in rates but has costs. Long-term, currency risk in developed market equities is generally accepted rather than hedged.

Currency risk in emerging markets is more severe than in developed markets. EM currencies are more volatile and tend to depreciate against the dollar over long periods:

• Indian Rupee: has depreciated from INR 45/USD (2005) to approximately INR 83/USD (2025). This ~2% annual depreciation erodes USD-denominated returns for INR investors.
• Brazilian Real: extreme volatility. BRL/USD has moved from 3.5 to 6.0 and back to 4.5 over the past 5 years. EM-currency hedging is expensive and usually impractical.
• South African Rand: significant long-term depreciation. ZAR/USD moved from 6 (2010) to 18 (2025).
• Implication for Indian investors in US ETFs: when INR depreciates, your USD assets gain value in INR terms automatically — this is a natural currency hedge for INR investors, not a risk.

• For long-term investors (10+ year horizon): don't hedge. The cost of FX hedging (interest rate differential between currencies) erodes returns, and the currency risk tends to diversify over long periods.
• For medium-term goals (3–7 years): consider partially hedged positions. GBP-hedged ETF versions (e.g., IGUS for UK investors) may be appropriate for money needed within 5 years.
• For Indian investors in US assets: INR depreciation actually works in your favour (USD assets appreciate in INR terms). Accept the currency exposure.
• For goal-based matching: if your goal is denominated in a specific currency (paying for Indian property), keep that portion of savings in the same currency (INR). Avoid FX risk on dedicated goal savings.
• Simplest approach: invest in the currency of your future expenses. If you'll spend in GBP, hold GBP-denominated assets or unhedged international assets with a long horizon.

Currency-hedged ETFs eliminate exchange rate fluctuations by using rolling forward contracts to lock in today's exchange rate. The cost of this hedge equals approximately the interest rate differential between the two currencies. In periods of high US interest rates, hedging USD exposure can be expensive for GBP or EUR-based investors.

• Hedging cost formula: roughly equal to (USD rate − local rate). In 2024–2026, with USD rates at 4–5% and EUR rates at 2–3%, hedging EUR/USD costs approximately 1.5–2.5%/year. This is a significant drag.
• Example: IWDA (unhedged) vs IWDA hedged to GBP. If USD appreciates 3% but hedging costs 2%, the hedged version gives approximately 1% better net return from currency. If USD depreciates 3%, unhedged loses 3% more but saved 2% in hedging cost — net −1% better.
• Equities over 10+ year horizon: academic consensus is that equity currency risk largely cancels out over long periods. Currency exposure for equity holdings is generally not worth hedging for long-term investors.
• Fixed income: currency-hedged bond funds ARE worth considering. Bond returns are smaller (3–5%/year) and currency swings can dominate returns. Hedging is more commonly justified for international bond holdings.
• Short-term (< 3 years): if you'll need the money within 3 years in a specific currency, hedging reduces risk even if it costs 1–2%/year — the certainty is worth the cost.

Rather than paying for explicit hedging via derivatives, many investors can structure their portfolios to achieve a natural currency hedge — where currency gains and losses in one part of the portfolio offset those in another.

• Match assets to liabilities: if you plan to retire in India and your future expenses will be in INR, hold more INR-denominated assets (Indian equity, NRE FDs). Your investment currency matches your future spending currency.
• Diversify across currencies: holding assets in USD, GBP, EUR, and INR means no single currency move dominates your portfolio. This isn't perfect hedging but reduces concentration risk.
• Real estate as currency hedge: property in your country of retirement provides both a natural INR hedge (if India) and direct cost-of-living protection. Not a liquid hedge but reduces long-term currency mismatch.
• Income currency matching: if your future salary or business income will be in INR (e.g., you plan to return to India), it's less important to hedge — your income naturally offsets INR-denominated expenses.
• Rebalancing as hedge: if USD strengthens 20%, your USD portfolio grows in local currency terms. Rebalancing (selling some USD assets, buying local assets) naturally monetizes this without explicit hedging.

• NRI with long-term India retirement plan: hold 30–50% in INR assets (NRE FDs, India equity). Let the rest stay unhedged in USD/GBP — the diversification benefit outweighs hedging cost.
• UK-based investor with 20+ year horizon: hold global equities unhedged (VWRA or IWDA). No hedging needed for long-horizon equity. If you hold international bonds, consider GBP-hedged versions.
• EU-based investor: EUR-denominated UCITS ETFs are available for most major indices. For equity, unhedged is fine. For bonds (AGGH etc.), EUR-hedged version often available and worth using.
• Investor within 5 years of a large expense in specific currency: hedge that specific portion. If you're buying a house in UK in 3 years with USD savings, convert USD to GBP forward or use GBP cash savings for that bucket.

• Q: Should I hedge my global equity portfolio against currency risk? A: For long-term equity investors (10+ year horizon), the academic consensus is no. Currency fluctuations largely cancel out over long periods. Hedging adds 0.5–2.5%/year in cost depending on interest rate differentials. The cost exceeds the benefit for most equity investors.
• Q: INR has depreciated 3–5%/year against USD. Does this help or hurt NRI investors? A: It helps NRI investors with USD assets. If USD assets appreciate 8% and INR depreciates 4%, the INR value of your USD portfolio increases by ~12%. Long-term, INR depreciation is a tailwind for NRI investors with USD investments.
• Q: What is the 'carry trade' and does it affect my ETF returns? A: The carry trade is borrowing in low-interest currencies and investing in high-interest ones. Currency-hedged ETFs use a similar mechanism — the hedging cost (or gain) equals approximately the interest rate differential. When USD rates are higher than GBP rates, hedging USD exposure costs GBP investors money.
• Q: How does a strong dollar affect my UCITS ETF returns? A: If you're a GBP investor holding VWRA (denominated in USD), a stronger dollar increases the GBP value of your holding — a currency gain. A weaker dollar reduces your GBP return. Over 20 years, these effects average out substantially.
• Q: Should I hold cash in multiple currencies? A: Holding an emergency fund in your primary spending currency makes sense. Beyond that, currency diversification across USD, GBP, and EUR provides some natural hedge. Holding 6+ currencies in cash creates unnecessary complexity for marginal benefit.