How Currency Risk Affects British Expats Investing Offshore

A question that comes up often among British expats who’ve settled in South Africa is some version of "should I be investing in pounds, dollars or rand?" It’s a fair question, and the honest answer is less satisfying than people want: there isn’t a single right currency, and anyone who tells you otherwise is guessing about exchange rates, which nobody does reliably, for very long.

The misconception buried in the question is that currency is a decision you make once, at the start, by picking a winner. It isn’t. Currency exposure is something you already have, whether you’ve thought about it or not, from the moment you hold assets in one country and pay your bills in another. The useful question isn’t "which currency should I pick?"; it’s "what currency will I actually be spending, and when?"

You already have currency exposure

If you moved from the UK to South Africa, your financial life is probably split across at least two currencies without you having chosen it. A pension or property left behind in the UK is a sterling asset. Your salary, your rent or bond, your school fees and your groceries are rand. Perhaps there’s a dollar-denominated investment somewhere in the middle.

That split is your currency position. Doing nothing doesn’t make it neutral; it just makes it accidental. When the rand moves against the pound, the purchasing power of your UK assets in Cape Town changes, and so does the sterling value of what you’re building in South Africa. Neither of those is a hypothetical risk you can opt into later; it’s the arrangement you’re already living in.

Recognising that is genuinely most of the work. Many people come at this question thinking they need to make a bold call on exchange rates, when what they actually need is to see clearly what they’re already holding.

The question that matters more: what will you spend it on?

Currency risk becomes concrete at the point of spending. Money you’ll spend in rand, in South Africa, in the next few years is exposed if it’s sitting entirely in another currency and the rate moves the wrong way before you need it. Money earmarked for something sterling-denominated a decade out (a UK retirement, university fees in Britain, supporting family there) is arguably more exposed if it’s held entirely in rand.

So the framing that tends to be more useful than "which currency is stronger" is: what are my future commitments, roughly when do they fall due, and what currency will they be denominated in? A portfolio that broadly reflects the shape of your future spending is doing something sensible about currency. One that ignores it is making a large, unexamined bet.

This is also why there’s rarely a clean answer for someone with genuinely split lives (family in both countries, an undecided retirement location, children who may study anywhere). In those cases spreading exposure across currencies is often less about optimising and more about not needing to be right about a decision you haven’t made yet.

Three things people tend to conflate

It helps to separate ideas that often get mashed together:

• The currency an investment is denominated in: what you’d see if you checked its value today.
• The currency of the underlying assets: a fund priced in dollars may hold companies earning in euros, yen and pounds. Its real exposure isn’t the label on the price.
• The jurisdiction the investment is held in: where it sits administratively. This is a separate question from currency altogether, and worth its own conversation about how different offshore centres are regulated.

Mixing these up leads to some odd conclusions: most commonly, someone believing they’re diversified because they hold several things all priced in the same currency, or believing they’ve taken on foreign exposure simply because a product is administered offshore.

What you can reasonably do about it

None of this points to a clever trick, and it’s less exciting than it sounds. In practice the levers are fairly ordinary:

• Look at the whole picture at once. Currency exposure only makes sense across everything you hold (UK pensions, local retirement savings, property, cash), not investment by investment.
• Match, roughly, rather than precisely. Aligning long-term money with the currency of long-term commitments is a directional exercise, not a spreadsheet you balance to the last unit.
• Think about timing of entry. Moving a large sum across currencies on a single day makes the outcome dependent on that day’s rate. Whether phasing makes sense depends on the situation; it’s the same trade-off that comes up in the lump-sum-versus-regular-savings question.
• Don’t confuse volatility with loss. A currency moving against you before you need the money is uncomfortable, but it’s only crystallised if you convert at that point. Timeframe matters more than the day’s headline.

There’s a tax dimension to holding assets across borders too, and it varies considerably with residency status and the type of asset. That’s genuinely outside what a blog post can settle. Speak to a tax adviser about your own position before making assumptions.

Questions worth answering first

• If you added everything up, what proportion of your assets is in each currency today?
• Over the next ten years, what are your largest expected costs, and what currency will they fall in?
• Is your answer to "where will I retire?" settled, or still open?
• Are you holding a currency position deliberately, or is it simply where things ended up?

Where this fits

Currency tends to be the part of offshore planning people either fixate on or ignore entirely, and neither serves them well. It sits alongside the broader questions covered on the offshore investing page: how offshore structures work, what to check before investing, and where assets are held. If a UK pension is part of your picture, the sterling-versus-rand tension is a live part of that too, and worth reading about what actually happens to a UK pension when you move to South Africa.

Working out your real currency exposure is mostly a matter of listing what you hold in each currency and what you’ll spend in each. If you’re not sure what your split currently looks like, an introductory call is a no-obligation way to talk through the general picture.

Frequently asked questions

Should I invest in pounds, dollars or rand?

There isn’t a single right currency, and no one can reliably guess exchange rate movements over time. The more useful question is what currency you’ll actually be spending in, and when. A portfolio that broadly reflects the shape of your future spending is doing something sensible about currency; one that ignores this entirely is making a large, unexamined bet.

Do I already have currency exposure without realising it?

Yes. If you’ve moved from the UK to South Africa, your financial life is likely split across currencies already: perhaps a UK pension or property in sterling, day-to-day costs in rand, and possibly a dollar-denominated investment too. Doing nothing about that split doesn’t make it neutral, it just makes it accidental. Recognising the exposure you already hold is genuinely most of the work.

How should I think about managing currency risk?

Look at everything you hold together rather than investment by investment, and aim to match, roughly, the currency of long-term money with the currency of long-term commitments. Think about timing when moving large sums between currencies, and remember that a currency moving against you is only a loss once you actually convert it. There is also a tax dimension to holding assets across borders, so speak to a tax adviser about your own position.

This article is for general information only and does not constitute financial, tax, or investment advice. Currency movements are unpredictable and can work for or against you. Any decisions about how your assets are held should be taken with regulated advice specific to your circumstances.