A domestic payment - say, a UK bank transfer between two UK accounts - is simple. Both banks participate in the same payment network (Faster Payments, BACS, or CHAPS). Instructions pass almost instantly, settlement is near-immediate, and costs are minimal.
An international payment is fundamentally different. There is no single global network connecting all the world's banks. Instead, payments travel through a patchwork of bilateral relationships, messaging standards, and country-specific settlement systems.
SWIFT - the Society for Worldwide Interbank Financial Telecommunication - is a messaging network, not a payment network. This distinction matters. SWIFT does not move money. It transmits standardised messages between banks telling them to move money through their own accounts.
Founded in 1973, SWIFT connects over 11,000 financial institutions in more than 200 countries. It is the backbone of international banking communication. But because it is a messaging layer, not a settlement layer, the actual movement of funds depends on what happens at each institution receiving the message.
"SWIFT is like the postal service of international banking - it delivers the message reliably, but the money still has to physically move through a chain of accounts."
SWIFT Global Payments Innovation (GPI), introduced in 2017, added a tracking layer to SWIFT payments, giving banks and their customers visibility of where a payment is in the chain. GPI has significantly improved transparency and reduced the time for SWIFT payments to arrive - most now settle within 24 hours, though many still take 2-5 days.
Your UK bank almost certainly does not have a direct account at every bank in every country in the world. It maintains accounts at a smaller number of large "correspondent banks" in each currency - typically major global institutions like Citibank, Deutsche Bank, or JP Morgan.
When you send money to a recipient whose bank is not directly connected to yours, the payment hops through one or more correspondent banks until it reaches one with a direct relationship with the recipient's bank. Each hop requires the correspondent to debit one nostro account (an account it holds at another bank) and credit another.
A "nostro" account is an account a bank holds at a foreign bank, denominated in that foreign bank's currency. "Vostro" is the same account from the foreign bank's perspective. These pre-funded accounts are the mechanism by which correspondent banks actually move value across borders without needing a real-time global settlement system.
Settlement is the moment when a payment is considered final - when the recipient's bank account is credited and the funds are available. This is distinct from the payment instruction being sent.
Most domestic payment systems offer same-day or near-instant settlement. International SWIFT payments typically settle within 1-5 business days, depending on the currencies involved, the number of correspondent banks, and whether compliance checks trigger any holds.
In foreign exchange, a "spot" trade conventionally settles two business days after the trade date (T+2). This is the standard settlement period in the interbank FX market. Same-day (T+0) and next-day (T+1) settlement are possible in many currency pairs at a slightly adjusted rate.
An alternative to SWIFT for many international payments is using local payment infrastructure. Rather than sending a SWIFT wire that passes through multiple correspondent banks, specialist providers like Stately FX hold accounts in multiple countries and can settle using each country's domestic payment network.
| Network | Region | Settlement | Typical cost |
|---|---|---|---|
| Faster Payments | United Kingdom | Seconds | Free/minimal |
| SEPA Credit Transfer | Eurozone | Same day | Very low |
| ACH | United States | 1-2 days | Low |
| Faster Payment Service | Singapore | Near-instant | Low |
| NPP / PayID | Australia | Near-instant | Low |
| SWIFT | Global | 1-5 days | High |
Using local rails rather than SWIFT eliminates most correspondent bank fees and typically reduces settlement time from days to hours or seconds. This is one of the core advantages of using a specialist payment provider over a traditional bank.
Any bank in the correspondent chain can hold a payment for compliance review - AML screening, sanctions checking, or simply because the transaction pattern looks unusual. These holds can last hours or days, with no notification to the sender.
If account details are wrong - incorrect IBAN, wrong BIC/SWIFT code, or mismatched name - the payment may be returned, held, or in worst cases sent to the wrong account. Recovering misdirected international payments can take weeks.
On SHA (shared charges) instructions, correspondent banks can deduct their fees from the payment amount itself. The recipient receives less than was sent, often without any notification of what was deducted or by whom.