What happens when a country gets cut off from SWIFT

SWIFT does not move money. It carries messages. When a bank in Tokyo needs to pay a bank in London, SWIFT delivers the instruction: how much, from which account, to which account. The actual money moves separately, through accounts that banks keep with each other. In 2025, SWIFT's network connected more than 11,500 banks across more than 200 countries and handled about 60 million messages a day. Nearly every international wire transfer on Earth travels through it. The BIC code printed on an international wire transfer is a SWIFT address. Most people only hear the name when a country is about to be sanctioned, and since 2012, Western governments have twice used SWIFT access as a sanction: against Iran and then against Russia. Both times, the results were more complicated than the headlines suggested.

How a wire transfer works

When you send money from a bank in New York to a bank in Berlin, your bank does not send dollars across the Atlantic. It sends a SWIFT message to the German bank with the payment details: the amount, the accounts, the parties. The German bank reads the message and credits the recipient. The actual money settles later through correspondent accounts, dedicated accounts that banks keep with each other for exactly this purpose. Your bank adjusts its books on one side. The German bank adjusts its on the other. SWIFT carried the instructions. The banks moved the money.

None of this happens instantly. A simple transfer might settle within a day. A more complex one, involving multiple currencies and several correspondent banks in the chain, can take three to five business days. The messages are fast. The settlement follows later.

Before SWIFT existed, cross-border payment instructions traveled by Telex: free-form text that the receiving bank had to read, interpret, and act on by hand. It was slow, full of errors, and easy to forge. In 1973, 239 banks from 15 countries incorporated SWIFT as a cooperative in Brussels to replace it. The first message went through in 1977. SWIFT grew because the more banks that joined, the more useful it became to every other bank. By the time anyone considered building an alternative, SWIFT was the global standard.

European banks created SWIFT partly to escape the dominance of Citibank, which ran much of the world's cross-border payment messaging in the early 1970s. Decades later, SWIFT itself became an instrument of Western foreign policy. It is organized as a cooperative under Belgian law, and when it is used as a sanction, the decision is formally European. But Washington's influence over the process has been decisive both times.

What happened to Iran

The first use of SWIFT as a direct sanction came in March 2012, when the European Union ordered the network to disconnect roughly 30 Iranian banks, including the central bank. The goal was to force Tehran into negotiating over its nuclear program.

Iran could still pump oil. It could still find buyers, mostly in China, India, Turkey, and South Korea. What it could not do was collect payment through normal channels. Iranian banks could not send the messages that tell foreign banks where to route the money. Revenue piled up in accounts abroad that Iran struggled to access or redirect. Some buyers worked out barter deals or routed payments through intermediary banks in third countries, but those workarounds were slow, expensive, and legally risky for everyone involved.

The results showed up within months. Before the cutoff, Iran exported roughly 2.5 million barrels of oil a day. By 2013, that had fallen to about 1.1 million. Revenue dropped from $95 billion in 2011 to $69 billion in 2012 and kept falling. The rial, Iran's currency, lost roughly half its value against the dollar that year. The price of imported goods surged, and ordinary Iranians who had nothing to do with the nuclear program paid for it in rising grocery bills.

Most analysts consider the SWIFT disconnection one of the sanctions that brought Iran to the negotiating table. The 2015 nuclear deal included reconnecting Iranian banks. Three years later, when the United States withdrew from the agreement, the banks were cut off again. By then, Iran had already started building direct payment channels with China and India, channels that turned out to be useful to another sanctioned country a few years later.

What happened to Russia

The second and largest SWIFT disconnection came in March 2022, days after Russia invaded Ukraine. The EU, with support from the United States, the United Kingdom, and others, removed seven major Russian banks from the network, including VTB, Russia's second-largest lender. Over the following months, the list grew to more than 90 Russian institutions. Western officials called it the "financial nuclear option."

In the first weeks, there was widespread expectation that Russia's economy would seize up. It did not.

Russia had been preparing since 2014. After Western sanctions over Crimea, the Russian central bank built a domestic messaging system called SPFS. When the 2022 cutoff came, Russian banks could still communicate with each other through it. More importantly, Russia's biggest trading partners arranged bilateral payment channels outside the SWIFT network. China was the most significant. By 2025, more than 90 percent of Russia-China trade was being settled in rubles and yuan rather than dollars.

The damage was real, though. Russian traffic on SWIFT fell more than 90 percent between 2022 and mid-2025, from about 160 million messages a year to roughly 16 million. The workarounds are slower, more expensive, and limited to a handful of partner countries. A Russian manufacturer importing parts from South Korea might now route payment through a Turkish intermediary using yuan, a process that takes days instead of hours and costs several percent of the transaction in fees. The economy absorbed the blow. It is paying a higher cost on every international transaction for as long as the disconnection lasts.

The less obvious lesson is in the details. Europe did not cut all Russian banks from SWIFT. It left Gazprombank, the main channel for European natural gas payments, connected for more than two years, because European utilities needed it to keep paying for Russian gas. The "nuclear option" came with a built-in exemption for the countries that used it. That compromise told every watching government something important: SWIFT disconnections are not absolute, and the countries imposing them will carve out exceptions when their own interests demand it.

Why nobody has built a replacement

China launched CIPS, the Cross-Border Interbank Payment System, in 2015 to clear renminbi payments across borders. By the end of 2025, it had about 1,770 participants across 124 countries. Russia's SPFS had roughly 580 users in 24 countries. India, Iran, and others have experimented with bilateral channels that bypass SWIFT entirely.

None of these systems comes close to replacing it. CIPS still relies on SWIFT's messaging infrastructure for an estimated 80 percent of its traffic. SPFS handles mainly Russian domestic transactions and trade with a small circle of partners. SWIFT connects 11,500 institutions across more than 200 countries. The gap is the same kind of network effect that keeps the dollar dominant in global trade: banks use SWIFT because other banks use SWIFT, and switching any single piece is pointless unless everyone switches at once.

The numbers are growing, though. CIPS processed a record 42,000 transactions in a single day in early 2026. That is tiny next to SWIFT's 60 million daily messages, but CIPS volume grew more than 20 percent in 2025. Every time Western governments use SWIFT as a sanction, they strengthen the case inside non-aligned central banks for building a fallback before they need one.

Why each disconnection weakens the next

SWIFT's power as a sanction rests on the absence of an alternative. But the two major disconnections so far have shown the same pattern. The target suffers real economic damage. It adapts, slowly and at a cost. And the adaptation reduces the system's reach by exactly enough to make the next cutoff less effective.

Iran's experience taught Russia to build SPFS before 2022. Russia's experience pushed China to expand CIPS. Both have given every sanctions-wary country a reason to build redundancy into its banking connections. The Belgian cooperative in La Hulpe still carries nearly all of the world's cross-border banking messages. But the share of the world that treats that fact as a risk rather than a convenience is larger than it was five years ago, and it is growing.