The short answer

A spot foreign exchange transaction is an agreement to buy one currency and sell another at today's rate, with the money settled straight away — by market convention within two business days. It's the right tool when a payment is due now or today's rate is good enough. The rate you get depends on who you trade with: a UK bank typically adds 1% to 3.55%, while an FX specialist such as Vita Capital, our FX partner, offers spot trades at competitive rates for transfers of all sizes, with a specialist to talk you through it.

What a spot trade actually is

A spot trade has three parts: two currencies (pounds and baht, for most readers), an agreed rate (the spot rate), and a settlement date (the day the money changes hands). In the professional market, the standard settlement date is two business days after the deal is booked — written as T+2, where T is the trade date.

For you, it works more simply. You agree a rate with your provider, you send your pounds, and the provider pays out the baht. Once you've booked, the rate is fixed — if the pound rises or falls an hour later, your deal doesn't change.

That's the key difference from three other ways of converting:

• A forward contract fixes today's rate for a payment on a future date — weeks or months away.
• A limit order waits and converts only if the market reaches a target rate you set.
• A stop-loss order converts automatically if the rate falls to a floor you set.
• A card payment or ATM withdrawal converts at the card network's or bank's rate at the time — a kind of spot conversion, but you don't agree the rate in advance.

How a spot trade works, step by step

1. Open an account with the provider — online, with identity and source-of-funds checks.
2. Ask for a quote — say how many pounds you're selling or how many baht you need.
3. Check the rate against the mid-market rate at that moment, and confirm the baht you'll receive.
4. Book the trade. The rate is now fixed and the deal is binding.
5. Send your pounds to the provider's client account by the deadline they give you.
6. The baht are paid to your Thai account — or a seller's, developer's or school's — with a confirmation.

With Vita Capital, you can do all of this with a dedicated FX specialist on the phone, who'll confirm the rate, the amount and the timing before anything is booked. Ask through our team and we'll arrange the introduction.

Spot, forward or limit order?

The four tools an FX specialist can offer, side by side.

General description. Terms vary by provider; Vita Capital's services from its private clients page (October 2026).

Where to book a spot trade

Our number one for larger spot trades, and the best options for everyday conversions.

How a spot rate is priced

Behind every spot quote are three rates:

On a spot trade, the margin is the cost. A UK bank's margin is reported at about 1% to 3.55%. An FX specialist prices larger trades more keenly, and the difference grows with the amount. On £100,000, every 1% is £1,000.

Settlement and value dates

The "value date" is when the currencies actually change hands. Here's what the terms mean.

Standard market conventions; AIB FX Centre defines spot settlement as "within two business days from the date of booking (known as T + 2)". Your provider confirms exact dates when you book.

Holidays: the hidden delay

A spot trade needs both countries' banking systems to be open. Thailand has more public holidays than the UK, and some fall in long runs — Songkran in April and the New Year period especially. A trade booked the day before a Thai holiday may not arrive until the banks reopen.

• Check both calendars before a payment with a deadline — a condo completion, a visa deposit or a school's due date.
• Book early in the week when you can, so a delay doesn't run into a weekend.
• Ask your provider for the value date when you book, in writing.
• Leave a buffer of several working days before anything that can't be moved.

When a spot trade is the right choice

When something else may be better

Vita Capital offers all of these alongside spot trades, so one specialist can help you choose — or split a large sum between them.

Spot trades in practice

Four illustrations at the mid-market rate of ฿44.38 = £1, comparing a UK bank's 3% margin with the mid-market value.

Illustrations only; amounts rounded to the nearest baht. A 3% margin is within the 1%–3.55% Wise reports for UK banks (August 2026). Fees and receiving charges not included. Get a Vita Capital quote to see what a specialist rate would deliver.

What to have ready before you book

• The exact amount — in pounds to sell, or baht you need to arrive.
• The recipient's details — account name, number, bank and SWIFT code. Thai accounts don't use IBANs.
• The purpose of the payment — living costs, property, school fees, a car.
• When it must arrive, allowing for holidays in both countries.
• Proof of where the money came from for larger sums — a sale completion statement, savings statements or a pension letter.
• Foreign currency or baht? For a condo, the money usually needs to arrive in foreign currency so your Thai bank can issue the FET form — check with your lawyer.
• Funds ready in your UK account, so you can pay the provider promptly once you book.
• The mid-market rate open on your phone, to check the quote.

How long is a spot quote held?

Because the market moves every second, a spot quote doesn't last long. In an app, the rate is usually guaranteed for a short window once you start a transfer. With a dealer on the phone, the rate is live — they'll quote it, and if you say yes, it's booked there and then. If you hesitate for ten minutes, expect a fresh quote that may be better or worse.

That's normal, and it's why preparation matters. Have the amount, the recipient and the funds ready before you ask, so you can decide while the quote is live. A good specialist will also tell you how the rate has moved recently and whether a limit order — leaving an instruction to convert at a target rate — might suit you better than booking on the spot.

Once booked, a spot trade is binding

When you agree a spot rate, the provider buys the currency in the market on your behalf. That's why the rate is fixed — and why the deal can't simply be cancelled. If you don't send your pounds, or you change your mind, the provider usually has to reverse the trade at whatever the rate is then, and you may have to cover any loss.

So before you say "yes" on the phone or click "book":

• Be sure of the amount and that the money is available.
• Be sure of the recipient and their bank details.
• Know the deadline for sending your pounds.
• Read the confirmation as soon as it arrives, and query anything that looks wrong straight away.

Mistakes that cost money

1. Accepting your bank's rate without a comparison. On larger sums, the margin is the biggest cost.
2. Checking the rate in the morning and booking in the afternoon — spot rates move all day.
3. Booking before the money is ready, then missing the funding deadline.
4. Forgetting Thai holidays before a fixed completion or visa date.
5. Converting everything at spot when part could go on a forward or limit order.
6. Trusting bank details in an email without confirming them by phone.

Booking safely from Thailand

Most spot trades are booked by phone or online — often from a condo, café or hotel in Thailand. A few habits keep your money safe:

• Confirm the recipient's bank details by phone, on a number you already have.
• Only pay into the client account named in your provider's own confirmation.
• Use a private connection for banking and trading apps, not open public Wi-Fi.
• Turn on two-factor sign-in on your bank and provider accounts.

How we researched this guide

We used AIB's FX Centre definition of a spot foreign exchange transaction and its standard T+2 settlement, Vita Capital's own published information on its private client services (October 2026), Wise's August 2026 comparison of UK banks' exchange-rate margins, and Thai banks' published SWIFT receiving tariffs. Worked examples use the mid-market rate of ฿44.38 = £1 (Wise, 12 October 2026). Vita Capital is JLIT's FX and escrow partner; we arrange introductions and may receive a fee, which never changes the rate you're quoted. Checked 13 October 2026. This guide is general information, not financial advice.