How Does Currency Risk Affect UK Investors Buying Overseas Shares?
Currency risk is the chance that exchange rate moves change what your overseas shares are worth in pounds. If the pound strengthens against the dollar or euro, your gains shrink or losses grow. If it weakens, your returns rise. Over short periods, currency swings can matter as much as the share price itself.
- Currency risk means the value of your overseas shares in pounds depends on the exchange rate as well as the share price.
- A stronger pound reduces your returns on dollar or euro shares, while a weaker pound boosts them.
- Currency effects can be large over a year or two but often matter less over many years, and they can work in your favour.
- You can manage the risk through diversification, sensible position sizes, low conversion costs and, if you choose, currency-hedged funds.
- A stocks and shares ISA shelters gains and dividends from UK tax, but it does not protect you from exchange rate moves.
Currency risk is the chance that changes in exchange rates raise or reduce the value of your overseas investments once they are converted back into pounds. If you buy a US share, you are making two bets at once: one on the company and one on the dollar against the pound. Most beginners only think about the first.
This guide explains how the effect works, when it matters, and what you can sensibly do about it.
What is currency risk when you buy overseas shares?
Currency risk, also called exchange rate risk or FX risk, is the gap between how your shares perform in their home currency and how they perform in pounds. A US share is priced in dollars, a German one in euros. Your account balance, though, is in sterling.
So every overseas holding has a hidden second price: the exchange rate. Even if the company does everything right, a move in the pound can add to your result or take away from it.
This applies whether you buy directly through a platform, as covered in our guide on how to buy US shares from the UK, or through a fund that holds overseas companies.
How does a stronger or weaker pound change my returns?
A stronger pound lowers the sterling value of your overseas shares, and a weaker pound raises it. The reason is simple: when the pound buys more dollars, each dollar you hold is worth fewer pounds.
Here is a made-up example. Say you invest £800 in shares of Company A, a fictional US business, when £1 buys $1.25. That is $1,000. The shares then rise 10% to $1,100.
- If the pound strengthens to $1.35, your $1,100 converts to about £815. Your gain is under 2%, not 10%.
- If the pound weakens to $1.15, your $1,100 converts to about £957. Your gain is almost 20%.
The numbers are illustrative, but the pattern is real. The table sums it up.
| What the pound does | Effect on dollar shares in £ | Plain-English result |
|---|---|---|
| Strengthens | Reduces sterling value | Gains shrink, losses deepen |
| Stays flat | No currency effect | Share price drives the result |
| Weakens | Increases sterling value | Gains grow, losses soften |
Notice that currency can swing in both directions. It is a source of uncertainty, not a guaranteed drag.
Does currency risk matter for FTSE 100 shares too?
Yes, to a degree. Many large UK-listed companies earn a big share of their revenue overseas, so their profits are affected by exchange rates even though the shares trade in pounds.
When the pound weakens, overseas earnings are worth more once converted into sterling, which can help reported profits. When it strengthens, the opposite can happen. This is one reason the FTSE 100 and the S&P 500 can behave differently, a point we cover in FTSE 100 vs S&P 500: where should UK investors look?.
It also means a UK-only portfolio is not free of currency exposure. It is just less obvious.
Does currency risk matter more in the short term or the long term?
Currency moves tend to matter most over shorter periods, such as one to three years, because company growth has not yet had time to dominate. Over a decade or more, a strong business compounding its profits usually matters more than a few swings in the exchange rate.
That said, currencies can trend in one direction for years, so it is not safe to assume they will cancel out. A sensible approach is to accept that currency adds noise, and to avoid investing money you may need within a year or two.
This fits with the wider idea of picking quality companies and giving them time, rather than trying to forecast the pound.
What does it cost to convert pounds into dollars or euros?
Converting currency usually costs money, and the charge varies a lot between platforms. Some take a percentage on each conversion, others build a margin into the exchange rate, and a few offer cheaper rates on larger trades.
There are a few other costs worth knowing about:
- Conversion fee: often charged on the way in and again on the way out.
- Dividend withholding tax: US companies usually withhold tax on dividends paid to UK investors. Completing the right tax form with your platform typically reduces the rate, but check the current position with them.
- Dealing fees: separate from currency charges, so compare the total cost, not just one line.
A small fee looks harmless, but if you trade often it adds up. Checking the rate you actually receive, not just the headline fee, is worth five minutes.
Does a stocks and shares ISA protect me from currency risk?
No. A stocks and shares ISA shelters your gains and dividends from UK tax within the £20,000 annual allowance, but it does nothing about exchange rates. Your overseas shares inside an ISA still rise and fall in pounds with the currency.
An ISA is still a very good home for overseas shares because any profit is free of UK capital gains tax and dividend tax. Our stocks and shares ISA guide explains how to choose one and what to check on foreign share access.
How can UK investors manage currency risk?
You cannot remove currency risk entirely, but you can reduce how much it bothers you. Practical steps include:
- Spread across currencies. Holding UK, US and European companies means no single exchange rate decides your whole result. Our guide to quality European stocks is a useful starting point.
- Size positions sensibly. A modest holding in a dollar share limits the damage if the pound jumps.
- Keep conversion costs low. Compare platform rates and avoid converting back and forth.
- Invest regularly. Buying in stages averages out the exchange rate you get, much like averaging a share price.
- Consider hedged funds. Some funds offer a currency-hedged version that aims to cancel out most exchange rate effects, usually with a small extra cost.
- Match currency to purpose. If you will eventually spend in dollars, say on a US property or retirement abroad, holding dollar assets is a feature, not a flaw.
Should I hedge currency risk or just accept it?
For most long-term private investors, accepting some currency risk is reasonable, and hedging is an optional extra rather than a must. Hedging removes the exchange rate effect in both directions, so you give up currency gains as well as losses.
Trading instruments such as CFDs can technically be used to take currency positions, but they are complex and leveraged, and most retail accounts lose money. Our guides on what a CFD is and CFDs on US stocks and indices explain the risks honestly. For hedging purposes, a hedged fund is simpler and easier to understand.
Key points to remember
- Overseas shares carry two prices: the share and the exchange rate.
- A strong pound trims returns; a weak pound lifts them.
- Currency risk often fades in importance over long holding periods, but it never fully disappears.
- Conversion fees and dividend tax matter, so check them before you trade.
- An ISA gives tax protection, not currency protection.
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This is research and educational information, not personal financial advice. Capital is at risk.
Frequently asked questions
Can currency moves turn a profitable overseas share into a loss?
Yes. If a share rises in dollars but the pound strengthens by more, your sterling value can still fall. The reverse can also happen, where a falling share looks better in pounds because the pound weakened. Always check performance in your own currency.
Are UK-listed shares of overseas companies free of currency risk?
No. A company listed in London can still earn most of its profits in dollars or euros, so its results and share price respond to exchange rates. The listing currency only changes how the price is quoted, not the underlying exposure.
Do US dividends have extra tax for UK investors?
Usually, yes. US companies typically withhold tax at source on dividends paid to UK investors, and completing the right tax form with your platform normally lowers the rate. An ISA does not generally recover it, so check your platform's current guidance.
Is a currency-hedged fund better than an unhedged one?
Not necessarily. A hedged fund reduces exchange rate swings but usually costs slightly more and removes potential currency gains. An unhedged fund is simpler and cheaper. Which suits you depends on your time horizon and how much volatility you can tolerate.
Should I wait for a good exchange rate before investing overseas?
Trying to time the pound is very hard, even for professionals. Most investors do better by investing in stages and focusing on company quality and sensible prices. If you have a long horizon, a single exchange rate matters less than staying invested.
How can I see how much currency affected my returns?
Compare the share's performance in its home currency with your return in pounds. The difference is roughly the currency effect. Many platforms show your gain in sterling, so check the share chart in dollars or euros alongside it.
The research team behind Best Stocks to Buy Now. We screen global markets for quality companies using a five-question test covering growth, margins, balance sheet, cash flow and valuation. Our articles are educational and are not personal financial advice. Capital is at risk.