The short answer

When you save across currencies, match each goal to the currency you'll spend it in: pounds for a UK university or retirement, baht for a Thai condo or school fees, a mix for a retirement that could be anywhere. Convert as few times as possible — ideally once, from the currency you earn into the currency of the goal — and never at a high-street bank's rate on regular contributions. For larger or regular amounts, a specialist can cut the margin and even fix the rate. Accept that currencies move: regular monthly saving smooths exchange rates just as it smooths markets, and long-term global investments are spread across many currencies anyway. Lawrence can help you set up savings in the right currencies from the start.

The three currencies in every expat's savings

It helps to recognise that every pound or baht you save passes through up to three currencies, and each is a separate decision.

1. The currency you earn in

Your income: a Thai salary in baht, a UK pension in pounds, an international salary in dollars, rent from a UK flat in pounds. You don't usually choose this one — but you need to know it, because it's where every contribution starts.

2. The currency you save and invest in

The currency your savings plan, platform account or fund is held in. You do choose this one. International savings plans typically offer several major currencies — one widely used plan offers seven, from pounds and dollars to Swiss francs and yen — but usually not baht. Platforms often let you hold several currencies side by side.

3. The currency you'll spend it in

Where the money will finally be used: UK university fees in pounds, a Thai condo in baht, retirement spending in whatever country you end up in. This is the currency that matters most, because it decides what your savings are actually worth to you.

The goal is to line those three up as closely as you can — and, where they can't line up, to convert as cheaply and as few times as possible.

Match each goal to its currency

The single most useful rule is simple: save in the currency you'll spend the money in. If your son will go to university in Manchester, the fees will be in pounds — so save in pounds, and a fall in the baht or dollar won't change what the fees cost you. If you're saving for a condo in Hua Hin, the price is in baht, so the money should move into baht before you buy, ideally at a rate you've fixed in advance.

For goals that are uncertain — a retirement that might be in Thailand, the UK or somewhere else entirely — a mix is often sensible. A diversified global portfolio is spread across dozens of currencies already, which reduces your dependence on any one of them.

Which currency for which goal

A simple guide to the currency each common goal is usually best saved in. Your own answer depends on where you'll actually spend the money.

Long-term money can stay international; money needed within a couple of years should be in the currency you'll spend.

The hidden cost of converting contributions

Every time money moves between currencies, the provider takes a margin — the difference between the real (mid-market) exchange rate and the rate they give you. High-street banks are the most expensive: reported UK bank margins run from about 1% to 3.55%, often on top of a transfer fee. Because the margin is built into the rate, most people never see it.

On a one-off transfer, that's an annoyance. On a monthly savings contribution, it compounds. Every month, part of your saving disappears before it's invested — and so does all the growth it would have earned.

The chart at the top of this page shows the scale. Converting £1,000 a month for twenty years at a 3% margin costs £30 a month — £7,200 in margins over the period. But because that money would otherwise have been invested, the real cost after twenty years of 8% growth is about £17,700. At a 1% margin it's about £5,900, and at 0.5% about £2,900.

How to cut the cost

• Never use a high-street bank's standard rate for regular conversions.
• For smaller monthly amounts, a low-cost online provider converting at the mid-market rate with a clear fee is usually best.
• For larger or regular amounts, a specialist can offer better rates and automated regular payments.
• Convert fewer, larger amounts where your plan allows — quarterly rather than monthly can cut fixed fees.
• Avoid double conversions — baht to pounds to dollars — by choosing your savings currency carefully.
• Check what your plan or platform charges to convert, if it does the conversion for you.

Where to start

A plan that puts each goal in the right currency, a specialist for regular and larger conversions, and a cheap route for smaller monthly amounts.

Living with currency swings

Currencies move — sometimes a lot. Over the twelve months to October 2026, the pound moved between about ฿42.22 and ฿44.82 at month-ends, a swing of more than 6% in a fairly calm year. Over longer periods, much bigger moves are normal.

For someone saving in pounds from a baht salary, that matters. ฿20,000 a month buys about £474 when the rate is ฿42.22, but only about £446 at ฿44.82 — the same effort, 6% less saved. The good news is that regular saving smooths currency swings in exactly the way it smooths markets: some months you convert at a good rate, some at a poor one, and over years the average evens out. That's currency averaging, and it happens automatically when you save every month.

When swings really matter

Currency swings matter most at two moments: when you convert a large lump sum, and when you need money in a particular currency on a particular date. Both are worth planning for:

• Phase a large conversion over several months, or set a target rate with a limit order.
• Fix the rate in advance with a forward contract for a known cost on a known date.
• Move money into the spending currency early — a year or two ahead for school fees, at agreement for a condo.
• Don't try to predict the market — nobody does it reliably, any more than with shares.

Hedging: when it makes sense

Some funds come in "hedged" versions, which use financial contracts to remove most of the effect of currency movements against a chosen currency. A pound-hedged global bond fund, for example, aims to give you the bonds' returns without the swings of the dollar, euro and yen against the pound.

Hedging tends to make most sense for bonds and cautious investments, where currency swings could otherwise overwhelm the steady returns you're buying them for. For long-term share investments, many investors don't hedge, accepting currency movements as part of a diversified portfolio that will even out over decades.

Hedging isn't free. Its cost roughly reflects the gap between the interest rates of the two currencies, and it adds complexity. In autumn 2026, with the Bank of England's rate at 3.75% and the Bank of Thailand's at 1.00%, hedging between pounds and baht in particular isn't straightforward — and few funds offer a baht-hedged version at all. For most expats in Thailand, the simpler approach is to hold near-term money in baht and leave long-term money diversified.

Education savings: the clearest case for getting currency right

Education is where the currency decision is clearest and the stakes highest. A child at a Thai international school costs baht; a child at a UK university costs pounds. Getting the currency wrong can add thousands to the bill in a single year.

For UK university, save in pounds from the start and you're protected from currency swings at the moment you need the money. For Thai school fees, money for each school year can be moved into baht as that year approaches — or the rate fixed in advance. And because education is usually years away, it's also one of the best goals to invest for growth.

Retirement savings when you don't know where you'll retire

Many expats in their thirties and forties genuinely don't know whether they'll retire in Thailand, return to the UK or move somewhere else. That uncertainty is a reason to keep retirement savings diversified across currencies rather than betting on one. A global portfolio does much of this for you.

As retirement gets closer and the picture becomes clearer, the currency mix can shift towards where you'll actually live — perhaps a growing share in baht if you settle here, or in pounds if you're heading home. The State Pension, if you have one, is paid in pounds and is frozen if you live in Thailand, so your other savings may need to do more of the work over time.

Multi-currency accounts and platforms

One of the simplest ways to keep conversions under control is to hold money in more than one currency at once, and convert only when it suits you. There are three common tools for this.

Multi-currency accounts

Online multi-currency accounts let you hold pounds, dollars, euros and baht side by side, convert between them at or close to the mid-market rate, and pay out in any of them. They're ideal for receiving income in one currency and holding it until you need it in another — for example, keeping pension income in pounds until the month you need baht.

Multi-currency investment platforms

Many international platforms let you hold cash and investments in several currencies within the same account. That means you can invest dollar savings in dollar-priced funds without converting, and pound savings in pound-priced funds, rather than forcing everything through one currency.

Plans with a choice of currency

International savings plans let you choose the plan currency at the start — and sometimes change it later. Choosing well at the outset avoids a lifetime of unnecessary conversions.

Our guide to multi-currency bank accounts for expats compares the account options in more detail.

Currency, tax and the money you bring into Thailand

For a Thai tax resident, where and when money is converted can matter for tax as well as for cost. Since 2024, foreign income earned from 2024 onwards that you bring into Thailand can be taxable here, while savings from before 2024 are treated differently. Converting money abroad and holding it there, or converting it as it arrives in Thailand, can change what counts as income brought in during a particular year.

A few practical habits help keep things clear:

• Keep pre-2024 savings in their own account, separate from newer income.
• Keep investment contributions and investment income apart, so you can show what each transfer was.
• Log every transfer into Thailand — date, amount, currency and what the money was.
• Take advice before moving large sums into Thailand once you're tax resident.

Our guide to receiving overseas income in Thailand explains the rules.

Couples who earn in different currencies

Many households in Thailand have two incomes in two currencies — a British partner's pension in pounds and a Thai partner's salary in baht, or a dollar salary alongside a baht business. That can be a strength: the household is naturally diversified, and a fall in one currency is partly offset by the other.

The practical trick is to let each income do the job it's best suited to. Baht income can cover day-to-day Thai spending without any conversion at all. Pound or dollar income can be saved in its own currency for goals in that currency — a UK university, a retirement fund — again without conversion. Only the gaps need converting. Done this way, a two-currency household can cut its conversion costs dramatically compared with putting everything through one account.

Setting it up in practice

1. List your goals and the currency each will be spent in.
2. Choose a savings currency for each — matching where you can, diversified where you can't.
3. Decide where each conversion will happen — once, at the start, at the lowest cost.
4. Set up a regular transfer through a low-cost provider or specialist, on a fixed date each month.
5. Keep near-term money in the spending currency — one to two years ahead of when it's needed.
6. Review once a year, and whenever your plans for where you'll live change.

Three worked examples

Tom: paid in baht, saving for UK university

Tom works for a Thai company in Bangkok and earns baht. His daughter, five, will probably go to university in the UK. He saves ฿25,000 a month into a plan held in pounds, converting through a low-cost provider rather than his Thai bank. The conversion happens once, every month, and the money stays in pounds — the currency of the fees — for thirteen years. Currency swings average out month to month, and when the fees fall due there's no conversion left to worry about.

Sue and Mark: UK pensions, retiring in Thailand

Sue and Mark receive pensions in pounds and live in Chiang Mai. Their long-term savings stay in a diversified global portfolio. Each year, they move the next year's spending into baht through a specialist, and keep a year's buffer in a Thai account. When they agreed to buy a condo, they fixed the rate for the ฿4.5 million price on the day they signed.

James: paid in dollars, unsure where he'll retire

James, 38, works for an international company in Bangkok and is paid in US dollars. He doesn't know where he'll retire. He saves in dollars into a globally diversified plan — avoiding any conversion at all — and keeps three months of spending in baht for everyday life. He'll revisit the currency mix at 50, when his plans are clearer.

The mistakes we see most often

1. Converting contributions at a high-street bank's rate every month for years.
2. Saving in the wrong currency for the goal — dollars for UK fees, pounds for a Thai condo.
3. Double conversions — baht to pounds to dollars — each with its own margin.
4. Converting a large sum on one day without phasing or a target rate.
5. Leaving a known baht cost unfixed until the week it's due.
6. Trying to time currency markets instead of averaging.
7. Ignoring the currency of fund charges and plan fees.
8. Never revisiting the currency mix when plans change.

Questions to ask yourself

• Which currency do I earn in — and does that change?
• Which currency will each goal be spent in?
• How many times is my money converted before it's invested?
• What margin am I paying on each conversion?
• Do I have any big, known costs whose rate I could fix?
• Would I be better off saving in a different currency?

Keeping transfers secure

Regular transfers between countries mean regular log-ins, often from a phone on shared Wi-Fi. A few habits keep them safe:

• Use a password manager and a different strong password for every account.
• Turn on two-factor sign-in on every bank, transfer and investment account.
• Use a private, protected connection on hotel, café and condo Wi-Fi.
• Confirm any change of payment details by phone before sending money.

How we researched this guide

We used Wise's August 2026 review of UK bank exchange margins (about 1% to 3.55%); OFX's GBP/THB month-end rates for the twelve months to October 2026 (฿42.22 to ฿44.82); Wise's mid-market rate of ฿44.38 = £1 on 12 October 2026; RL360's January 2024 Regular Savings Plan brochure for the currencies offered by one widely used plan; and the Bank of England's September 2026 and Bank of Thailand's August 2026 rate decisions. The conversion-cost and education figures are illustrations at 8% a year, not forecasts. Checked 13 October 2026. Investment growth isn't guaranteed and values can fall as well as rise. This guide is general information, not personal financial advice.