What Is SWIFT and How Does It Work?

Somewhere in the suburbs of Brussels, in a nondescript building in La Hulpe, sits the nerve centre of global finance. No trading floors. No vaults. No gold. Just servers, fibre-optic cables, and a messaging system that processes roughly 45 million messages per day.

This is SWIFT — the Society for Worldwide Interbank Financial Telecommunication. And if you’ve ever sent money abroad, received an international wire transfer, or watched the news during sanctions debates, you’ve encountered its shadow.

Yet for something so central to how the world’s money moves, remarkably few people understand what SWIFT actually is, how it works, or why disconnecting a country from it amounts to a form of financial warfare. In an era where the geopolitical order is fragmenting, understanding SWIFT isn’t optional — it’s essential.

The Birth of SWIFT: From Telex to Standardised Messaging

Before SWIFT existed, international banking communications relied on the telex network — essentially, banks sending each other typed messages over telephone lines. It was slow, error-prone, and wildly inconsistent. A transfer instruction from Citibank in New York to Deutsche Bank in Frankfurt might use completely different formatting than one from Barclays in London to Sumitomo in Tokyo.

By the early 1970s, the volume of international transactions had grown to the point where this ad hoc system was becoming untenable. Banks were processing thousands of cross-border payments daily, each requiring manual verification and interpretation. Errors were common. Fraud was easier than it should have been. Something had to change.

In 1973, 239 banks from 15 countries came together to form SWIFT as a cooperative society under Belgian law. The choice of Belgium was deliberate — a small, neutral European country that wouldn’t give any single nation’s banking system undue influence. SWIFT went live in 1977, replacing telex messages with a standardised, secure messaging format.

This distinction matters enormously, because it means SWIFT is both less and more powerful than most people assume. Less, because cutting a bank off from SWIFT doesn’t freeze its assets or seize its deposits. More, because without SWIFT, a bank essentially loses the ability to communicate reliably with the rest of the global financial system.

How SWIFT Actually Works

Every financial institution connected to SWIFT receives a unique identifier called a BIC (Bank Identifier Code), sometimes called a SWIFT code. This is the 8-to-11 character code you’ve probably seen on international wire transfer forms — something like DEUTDEFF (Deutsche Bank, Frankfurt) or CHASUS33 (JPMorgan Chase, New York).

When Bank A wants to send a payment instruction to Bank B, it composes a standardised message. SWIFT has developed an extensive library of message types, historically using the MT (Message Type) format and increasingly migrating to the newer ISO 20022-based MX format.

The Message Flow

Consider a simple example: a company in Amsterdam wants to pay a supplier in Seoul. Here’s what happens behind the scenes:

Step 1: The Dutch company instructs its bank (say, ING) to send €50,000 to the supplier’s account at KB Kookmin Bank in South Korea.

Step 2: ING composes a SWIFT MT103 message — the standard format for single customer credit transfers. This message contains the sender’s details, the beneficiary’s account information, the amount, the currency, and any special instructions.

Step 3: The message travels through SWIFT’s secure network to KB Kookmin Bank. But here’s the catch — ING probably doesn’t have a direct relationship with KB Kookmin. So the message routes through one or more correspondent banks that do.

Step 4: Each bank in the chain debits and credits its nostro/vostro accounts (accounts they hold with each other) to settle the actual funds. The SWIFT message is the instruction; the settlement happens through pre-existing banking relationships.

Step 5: KB Kookmin credits the supplier’s account, converts to Korean won if needed, and the transaction is complete.

The entire process might take anywhere from a few hours to several business days, depending on the currencies involved, the number of intermediary banks, and compliance checks along the way.

Scale and Scope

The numbers are staggering. As of 2025, SWIFT connects:

• 11,500+ financial institutions
• 200+ countries and territories
• 45+ million messages per day (peak days exceed 50 million)
• An estimated $5 trillion+ in daily transaction value passes through SWIFT-instructed transfers

SWIFT’s network effects are what make it so dominant. The more banks that use it, the more valuable it becomes for every participant. Building an alternative isn’t just about technology — it’s about convincing thousands of institutions across hundreds of jurisdictions to adopt a new standard simultaneously.

SWIFT’s Governance: Who Controls It?

On paper, SWIFT is a neutral cooperative. It’s incorporated under Belgian law, overseen by the National Bank of Belgium, and governed by a board of 25 directors drawn from its member institutions. The G10 central banks (including the Federal Reserve, ECB, Bank of England, and Bank of Japan) serve as overseers.

In practice, the picture is more complicated. The United States has historically exercised outsized influence over SWIFT, not through formal governance channels but through the centrality of the US dollar in international finance. Since roughly 40-50% of all SWIFT messages involve USD-denominated transactions, and since dollar clearing must ultimately pass through US correspondent banks, Washington has significant leverage.

This leverage became explicit after September 11, 2001, when the US Treasury’s Terrorist Finance Tracking Program (TFTP) gained access to SWIFT data to monitor terrorist financing. The programme was revealed by the New York Times in 2006, causing a major diplomatic incident with European governments who objected to US surveillance of what was supposed to be a neutral European system.

The Nuclear Option: SWIFT as a Weapon

For most of its history, SWIFT was a technocratic backwater — vital infrastructure that few outside banking circles thought about. That changed when policymakers discovered it could be weaponised.

Iran, 2012: The First Major Disconnection

In March 2012, under pressure from the European Union and the United States, SWIFT disconnected approximately 30 Iranian financial institutions, including the Central Bank of Iran. It was the first time SWIFT had been used as a sanctions enforcement tool at this scale.

The impact was immediate and severe. Iran’s oil exports — the lifeblood of its economy — plummeted because buyers couldn’t easily pay for Iranian crude. The country lost access to roughly $100 billion in foreign reserves held abroad. Inflation surged. The rial collapsed.

But Iran adapted. It shifted to bilateral payment arrangements with key trading partners, used intermediary banks in countries like Turkey and the UAE, and developed workarounds involving gold, barter, and informal money transfer networks (hawala). When sanctions were partially lifted under the 2015 JCPOA nuclear deal, Iranian banks were reconnected to SWIFT. When the US withdrew from the deal in 2018, they were disconnected again.

The Iranian experience demonstrated both SWIFT disconnection’s power and its limits. It inflicted enormous economic pain but didn’t achieve its ultimate political objective — Iran’s nuclear programme continued. And it taught every government watching that dependence on SWIFT was a strategic vulnerability. As we’ve documented, Iran eventually turned its geographic position into a currency negotiating tool, leveraging the Strait of Hormuz to extract concessions from both Western and Eastern powers.

Russia, 2022: The Biggest Test

When Russia invaded Ukraine in February 2022, Western nations announced that selected Russian banks would be cut off from SWIFT. The measure was described as a “nuclear option” in financial warfare — though in reality, it was more targeted than total. Major energy-related banks were initially exempted to keep European gas payments flowing.

The sanctions eventually expanded to cover more Russian institutions, but the results were mixed:

• Short-term shock: The ruble initially crashed 50%, Russian stock markets were shuttered for weeks, and capital flight accelerated
• Medium-term adaptation: Russia rerouted trade through countries like China, India, Turkey, and the UAE. Russian oil continued to flow, just through different channels and at discounted prices
• Long-term restructuring: Russia accelerated development of its SPFS alternative messaging system and deepened financial integration with China’s CIPS network

Perhaps most significantly, the Russia sanctions sent a clear signal to every non-aligned nation: your access to the global financial system is conditional on Western approval. This realisation has driven a wave of infrastructure development aimed at reducing SWIFT dependence.

The Alternatives: CIPS, SPFS, and the Fragmentation of Finance

The weaponisation of SWIFT has catalysed the most significant challenge to Western financial infrastructure dominance in decades. Several alternative systems are now operational or under development.

China’s CIPS (Cross-Border Interbank Payment System)

Launched in 2015, CIPS is the most serious challenger to SWIFT-mediated dollar dominance. Unlike SWIFT, CIPS is an actual payment system, not just a messaging network — it can both instruct and settle transactions in Chinese yuan.

Key facts about CIPS:

• 1,500+ participating institutions across 110+ countries (as of 2025)
• Processes approximately 26,000 transactions per day
• Annual transaction value exceeding ¥100 trillion (~$14 trillion)
• Offers 24-hour processing (vs. SWIFT’s business-hours constraints in some corridors)

CIPS still uses SWIFT messaging for many transactions — the two systems are currently more complementary than competitive. But China is steadily building the capability for CIPS to function independently, particularly for yuan-denominated trade with Belt and Road Initiative partner countries.

Russia’s SPFS (System for Transfer of Financial Messages)

Russia’s answer to SWIFT was developed after the 2014 Crimea sanctions, when the threat of disconnection first became real. SPFS went operational in 2017 and has grown significantly since 2022.

However, SPFS remains limited compared to SWIFT. It has roughly 500 participants, mostly Russian domestic banks plus some institutions in Belarus, Kazakhstan, Kyrgyzstan, Armenia, and a handful of other countries. Its message formats are not fully compatible with SWIFT standards, creating friction for international users.

India’s SFMS (Structured Financial Messaging System)

India operates its own domestic messaging system through the Reserve Bank of India. While primarily designed for domestic interbank communication, India has explored linking SFMS with other national systems to create bilateral or multilateral alternatives to SWIFT for specific trade corridors.

The mBridge Project

Perhaps the most ambitious alternative is the mBridge project, a multi-central bank initiative involving the BIS Innovation Hub, the People’s Bank of China, the Hong Kong Monetary Authority, the Bank of Thailand, the Central Bank of the UAE, and Saudi Arabia’s central bank. mBridge uses distributed ledger technology to enable real-time, multi-currency cross-border payments without relying on SWIFT or the correspondent banking system.

While still in pilot phase, mBridge represents a fundamentally different architecture for international payments — one that bypasses not just SWIFT but the entire correspondent banking model that has underpinned cross-border finance for decades.

De-Dollarisation and the Future of Financial Messaging

The story of SWIFT alternatives cannot be separated from the broader de-dollarisation movement. The two are intimately linked: SWIFT’s dominance reinforces dollar dominance (because most SWIFT messages involve USD), and dollar dominance reinforces SWIFT’s dominance (because institutions need SWIFT to clear dollar transactions).

Break one link in this chain, and the other weakens. This is precisely what China, Russia, and other BRICS+ nations are attempting.

The numbers tell a story of gradual but real change:

• The US dollar’s share of global reserves has fallen from ~72% in 2000 to ~58% in 2025
• The yuan’s share of SWIFT payments has grown from negligible to approximately 4.7% — still small, but a fivefold increase in five years
• Bilateral trade settlements in local currencies (bypassing the dollar and often SWIFT) have surged, particularly in Russia-China, Russia-India, and China-Middle East corridors
• Central bank digital currencies (CBDCs) in development across 130+ countries could eventually enable direct central bank-to-central bank settlement without any intermediary messaging system

The Fragmentation Scenario

The most likely near-term outcome is not that SWIFT collapses or that a single alternative replaces it. Instead, we’re heading toward a fragmented financial messaging landscape:

Zone 1 — The Western Bloc: SWIFT remains dominant for transactions involving US, EU, UK, Japan, Australia, and allied nations. Dollar clearing continues through New York-based correspondent banks.

Zone 2 — The China Sphere: CIPS handles an increasing share of yuan-denominated trade, particularly with Belt and Road countries, ASEAN, and parts of Africa and the Middle East.

Zone 3 — The Non-Aligned: Countries like India, Brazil, Saudi Arabia, and the UAE maintain access to multiple systems simultaneously, choosing which to use based on the specific transaction and counterparty.

Zone 4 — The Excluded: Countries under comprehensive sanctions (currently Iran, North Korea, parts of Russia) operate through workarounds, bilateral arrangements, and underground financial networks.

What SWIFT Means for Ordinary People

You might be thinking: this is all very interesting for geopolitical analysts, but why should I care? Several reasons.

Your international transfers depend on it. If you’ve ever sent money to family abroad, paid for an overseas purchase, or received payment from a foreign client, SWIFT was almost certainly involved. The fees you pay for international wire transfers (often $25-50 per transaction) are partly a reflection of the correspondent banking system that SWIFT coordinates.

Financial fragmentation could raise costs. If the global financial system fragments into competing messaging zones, cross-border transactions between zones could become slower and more expensive. A European company paying a Chinese supplier might need to navigate two different systems instead of one.

Your currency’s value is connected. The dollar’s role as the dominant SWIFT currency supports its value. If alternative systems grow and reduce dollar demand for international transactions, this could gradually affect dollar purchasing power — and by extension, the price of imports for Americans and anyone pegging to the dollar.

Sanctions affect global supply chains. When a major economy is disconnected from SWIFT, the disruption ripples through global supply chains. The energy price spikes of 2022-2023 were partly a consequence of the friction created by sanctioning Russia’s financial system while still needing its energy exports.

Financial privacy is at stake. SWIFT data reveals enormous amounts about global financial flows. Who has access to this data — and how they use it — is a question with implications for everything from counter-terrorism to corporate espionage to individual privacy.

The Technology Question: Can Blockchain Replace SWIFT?

Every discussion of SWIFT’s future eventually arrives at blockchain and distributed ledger technology (DLT). The pitch is appealing: instead of routing messages through a centralised cooperative, why not use a decentralised network that no single entity controls?

In theory, blockchain could eliminate the need for SWIFT entirely. Smart contracts could automate payment instructions. Settlement could be instantaneous rather than taking days. And no government could weaponise a system that no one controls.

In practice, the barriers are formidable:

• Regulatory compliance: Banks are legally required to perform KYC (Know Your Customer) and AML (Anti-Money Laundering) checks. Fully decentralised systems make this difficult
• Scalability: SWIFT processes 45+ million messages daily. No public blockchain can match this throughput
• Institutional inertia: 11,000+ financial institutions have invested decades in SWIFT integration. Migration costs would be enormous
• Governance: Ironically, the “no one controls it” feature that makes blockchain appealing is also what makes regulators and central banks wary

The more realistic path is hybrid: SWIFT itself has been experimenting with DLT integration, and projects like mBridge use distributed ledger technology within a controlled, central bank-governed framework. The future likely isn’t “blockchain vs. SWIFT” but “SWIFT incorporating blockchain elements while alternatives chip away at its monopoly.”

SWIFT’s own response has been to innovate. Its gpi (Global Payments Innovation) initiative, launched in 2017, has significantly improved payment speed and transparency within the existing system. SWIFT gpi now covers over 80% of cross-border payments on the network, with most reaching the beneficiary within 24 hours and many within minutes.

The Geopolitical Calculus: When to Pull the Trigger

For Western policymakers, the decision to disconnect a country from SWIFT involves a complex calculus:

Maximum impact scenarios: SWIFT disconnection is most effective against countries that are deeply integrated into the dollar-based financial system, have limited alternatives, and face a unified international front. Iran in 2012 was close to this ideal scenario.

Diminishing returns scenarios: Against large economies with significant commodity exports and willing alternative partners, SWIFT disconnection inflicts pain but doesn’t achieve capitulation. Russia in 2022 demonstrated this — the sanctions hurt, but Russia’s oil and gas revenues found alternative channels.

The deterrence paradox: The threat of SWIFT disconnection is often more powerful than its actual use. Once a country has been disconnected, it has every incentive to build alternatives and reduce future vulnerability. The threat only works as long as the target believes reconnection is possible and desirable.

Collateral damage: Disconnecting a major economy from SWIFT doesn’t just hurt the target — it disrupts every country and company that does business with it. European companies that depended on Russian gas faced enormous costs from the financial friction created by sanctions.

Looking Ahead: SWIFT in 2030

Several trends will shape the evolution of global financial messaging over the next five years:

1. ISO 20022 migration. SWIFT is transitioning from legacy MT messages to the richer ISO 20022 (MX) format. This standardisation could actually strengthen SWIFT’s position by making its messages more data-rich and compatible with modern systems — but it also makes it easier for alternatives to achieve interoperability.

2. CBDC interoperability. As central bank digital currencies roll out, the question of how they communicate across borders becomes critical. SWIFT is positioning itself as the interoperability layer for CBDCs, but projects like mBridge offer competing visions.

3. Geopolitical escalation or de-escalation. A resolution of the Russia-Ukraine conflict could lead to partial SWIFT reconnection, potentially slowing the development of alternatives. Conversely, new conflicts — particularly involving China — could accelerate fragmentation dramatically.

4. The Middle East pivot. Saudi Arabia’s participation in mBridge and its growing financial ties with China suggest that even traditional US allies are hedging their bets on financial infrastructure dependence.

5. African and Southeast Asian growth. The fastest-growing economies and populations are in regions that are increasingly unwilling to accept a financial system governed primarily by Western nations. Their infrastructure choices over the next decade will significantly influence the balance of power.