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You've signed the contract on a flat in Porto and the notary wants €40,000 in escrow by Friday. Or a supplier in Ho Chi Minh City has emailed an invoice with a bank name you've never heard of. Either way, you're about to make an international wire transfer, and the numbers on the screen don't fully explain what happens next.
Here's the honest version of the plumbing: how it works, what it costs, and when you should walk away and use something else.
A wire transfer crosses borders through the SWIFT network, which is not a payment system at all. It's a messaging cooperative owned by member banks, connecting more than 11,000 institutions in over 200 countries. Your bank doesn't push euros into a Spanish account directly. It sends an instruction, and the money moves through accounts that banks hold with each other.
If your bank and the recipient's bank have a direct relationship, that's one hop. Often it isn't direct. A payment from a small regional bank in Kansas to a credit union in rural Poland might pass through two or three intermediary institutions, each of which takes a small bite.
App-based providers usually don't wire anything. They collect your pounds in London, pay out of a local account in Poland, and never touch SWIFT. That's why a transfer can arrive in minutes for a fraction of the cost. It's also why they cap how much you can send, and why the money sometimes arrives from a company name rather than yours, which matters if a landlord or a lawyer needs to see a bank-to-bank trail.
That last point is where most of the money disappears. The fee your bank quotes you is visible. The markup on the exchange rate is not.
Send £20,000 from the UK to Spain and you might see a flat fee of £25 and assume that's it. In practice you're paying several things at once:
On £20,000, a 2.5% margin is £500. The £25 fee is a rounding error next to it. If your bank can't tell you the mid-market rate at the moment of the transfer, you can't see what you're paying, which is rather the point. There's a detailed walkthrough of how currencies are priced and where the spread actually goes if you want the mechanics.
Some wires land in hours. Others sit in limbo for a week. The difference usually comes down to cut-off times, time zones, and the currencies involved.
Miss a 3pm cut-off on a Thursday and your payment may not leave until Friday, then hit a weekend, then arrive Monday, minus a local holiday you didn't know about. Payments in major currencies clear faster than ones in, say, Kenyan shillings or Peruvian soles.
One quirk catches people out constantly: US dollars sent between two countries that aren't the United States usually travel through a US correspondent bank, because dollars ultimately clear in New York. A payment from Brazil to Japan in USD can pass through New York and pick up two sets of charges on the way. Sending in a different currency sometimes costs less.
Wires are slow and expensive, and for plenty of situations they're still correct:
For a €200 payment to a friend in Italy, or a monthly remittance you send every four weeks, wiring is the wrong instrument. The breakdown of online transfer fees, speed and safety is a better starting point for those.
Banks increasingly require the account holder name to match the payment exactly. "Dave Chen" versus "David Chen" can trigger a rejection and a £25 return fee. Copy the name from the recipient's own bank statement, not from their email signature.
Europe, the UK, and much of the Middle East use IBANs. The US, Canada, and Australia use routing and account numbers. Sending an IBAN to a US bank will fail. Check which country the receiving account actually sits in, not where the person lives.
Many wire forms ask you to choose SHA, BEN, or OUR. OUR means you pay all charges, including the receiving bank's. SHA splits them, so deductions come out of the amount the recipient gets. If a supplier expects exactly €15,000 against an invoice, choose OUR or the shortfall becomes your problem.
An invoice number in the reference gets your payment matched to your order. An empty field gets it sitting in a suspense account while someone tries to work out who sent it.
For anything over about $10,000, it's worth talking to a foreign exchange broker rather than accepting your bank's retail rate. Brokers buy currency in bulk and often quote a margin of 0.3% to 0.8%, and on larger sums that margin is negotiable. A £150,000 property deposit at 0.5% instead of 3% keeps £3,750 in your pocket, which is not an insignificant slice of a renovation budget.
There are legitimate ways to move money across borders without handing over a 3% premium, mostly involving getting a quote in advance and comparing it against the mid-market rate rather than against your bank's own published rate.
Batch payments where you can. If you're paying three suppliers in the same currency this month, consolidate into one transfer and save two sets of fixed fees. And if you send money to the same country regularly, setting up a cheaper repeat route beats re-learning the whole process every quarter.
Wire fraud rarely involves hacking. It involves a convincing email. A supplier's address is spoofed, or their inbox is compromised, and an "updated banking details" message arrives two days before an invoice falls due. The invoice looks normal. Only the account number changed.
Wire transfers are close to irreversible. Once funds are credited, a recall depends on the recipient bank's cooperation and the money still being there. It usually isn't. Firms have lost six-figure sums this way, and courts have generally been reluctant to hold banks liable when the customer authorised the payment themselves.
One control prevents almost all of it. Call the recipient on a number you already have, from a previous contract or their own website, and read the account details back to them. Not the number in the email.
Send it on a Tuesday morning rather than a Friday afternoon and you've already removed two days from the wait.
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