You have just looked up a SWIFT code, double-checked the bank name, and filled in every field on the transfer form. You press Send. The screen confirms your instruction, a reference number appears, and then — silence. Your money has entered a system that moves trillions of dollars every day, yet most people have no idea what happens inside it. This article walks you through every stage of an international wire transfer, from the moment you authorise it to the moment it lands in the recipient’s account.
Step 1 — Your Bank Creates an MT103 Message
Within minutes of your confirmation, your bank’s payment engine generates a structured electronic message known as an MT103. The “MT” stands for Message Type, and 103 is the specific format reserved for single customer credit transfers — in plain language, one person or company sending money to another.
An MT103 is not a free-form note. It follows a rigid template defined by the SWIFT organisation, with numbered fields that every participating bank in the world understands the same way. The most important fields include:
- Field 20 (Transaction Reference): Your bank’s internal identifier for the payment.
- Field 32A (Value Date, Currency, Amount): The date on which the money should settle, the currency, and the exact amount.
- Field 50 (Ordering Customer): Your name, address, and account number as the sender.
- Field 57 (Account With Institution): The beneficiary’s bank, identified by its SWIFT/BIC code.
- Field 59 (Beneficiary): The person or company receiving the funds, along with their account number or IBAN.
- Field 71A (Charges): Who pays the transfer fees — sender (OUR), receiver (BEN), or shared (SHA).
- Field 121 (UETR): A Unique End-to-End Transaction Reference, a 36-character tracking code assigned to every SWIFT payment since late 2018.
Think of the MT103 as a highly standardised shipping label. It tells every bank along the route exactly where the money needs to go, how much it is, and who is responsible for the costs. Your bank checks the message for compliance with local regulations, screens it against sanctions lists, and then transmits it into the SWIFT network.
Step 2 — The Message Enters the SWIFT Network
Here is the single most misunderstood fact about international transfers: SWIFT does not move money. It moves messages. The Society for Worldwide Interbank Financial Telecommunication, headquartered in La Hulpe, Belgium, operates a secure messaging network that connects more than 11,000 financial institutions across 200 countries. When your bank sends the MT103, SWIFT acts as a trusted postal service — it encrypts the message, validates its format, routes it to the correct recipient bank, and confirms delivery.
The network itself runs on redundant data centres spread across multiple continents, designed to guarantee delivery even during regional outages. Messages are encrypted using SWIFT’s proprietary protocols, and every institution on the network must pass rigorous security audits to maintain access. This is why SWIFT has remained the backbone of international finance for over five decades: not because it is the fastest option, but because it is the most universally trusted.
Once the MT103 reaches the receiving bank’s SWIFT interface, the bank’s systems parse the message and determine whether it can process the payment directly or whether it needs help from an intermediary. In most cases, it needs help.
Step 3 — Correspondent Banks
Unless your bank and the recipient’s bank have a direct relationship — meaning they hold accounts with each other — the payment must travel through one or more correspondent banks. These are large institutions, typically major global banks, that maintain vast networks of accounts with banks around the world. They serve as bridges between institutions that do not deal with each other directly.
Why Intermediaries Are Needed
There are roughly 11,000 banks on the SWIFT network. For every pair of banks to hold accounts with each other, there would need to be tens of millions of bilateral relationships. That is simply not practical. Instead, the system relies on a hub-and-spoke model. A regional bank in Southeast Asia might hold a USD account at a major New York bank, which in turn has relationships with thousands of other institutions. When money needs to flow between two banks that have never interacted, the correspondent bank in the middle makes it possible.
Most cross-border payments pass through one or two intermediaries. A transfer from a small bank in Brazil to a community bank in Japan, for example, might route through a large bank in New York (for the USD leg) and then through a major bank in Tokyo (for the JPY conversion and final delivery). Each intermediary along the chain receives its own SWIFT message — typically an MT202 COV, which is the bank-to-bank equivalent of the MT103 — instructing it to move funds onward.
How Correspondent Banks Are Selected
Banks choose their correspondents based on the currencies they need to handle, the geographic corridors they serve most frequently, the fees charged, and the speed of processing. A bank that handles a large volume of EUR payments will typically have a correspondent relationship with a major European bank that participates directly in the TARGET2 clearing system. If you want to understand which intermediary banks are likely to handle your specific transfer, you can look up the correspondent banking chain for any SWIFT code at ohmyfin.ai/correspondent-banks, which maps out the typical intermediary relationships for each institution.
Where the Money Actually Moves
This is where the transfer becomes tangible. Correspondent banks settle payments through nostro and vostro accounts. A nostro account (from the Latin “ours”) is an account that your bank holds at the correspondent bank, denominated in the correspondent’s local currency. From the correspondent’s perspective, the same account is a vostro account (“yours”). When the correspondent bank receives the MT103 or MT202 COV instruction, it debits the sending bank’s nostro account and credits the next bank in the chain. No physical cash crosses a border — the balances in these pre-funded accounts are simply adjusted.
Each intermediary is entitled to deduct a processing fee from the payment, which is why the amount that arrives at the destination can be slightly less than the amount you sent, especially if you chose the SHA (shared charges) option. These fees typically range from 10 to 30 USD per intermediary, though they vary by bank and corridor.
Step 4 — Settlement and Credit
Once the payment reaches the final correspondent or the beneficiary’s bank directly, it needs to be settled through a local clearing system. This is where the actual ledger entries are made in the domestic banking infrastructure of the destination country.
Major Clearing Systems by Currency
Each major currency has its own high-value payment system, and the choice of system affects both speed and operating hours:
- EUR — TARGET2: The Trans-European Automated Real-time Gross settlement Express Transfer system is operated by the Eurosystem (the ECB and national central banks). It processes payments in real time during European business hours and is the primary channel for high-value euro transfers. Its successor, T2, launched in March 2023, consolidates multiple services into a single platform.
- USD — Fedwire and CHIPS: Fedwire, operated by the Federal Reserve, provides real-time gross settlement for domestic and international USD payments. CHIPS (Clearing House Interbank Payments System) is a private-sector alternative that nets payments throughout the day and settles them in batches, handling roughly 95 percent of international USD transfers. Both operate during US business hours, which is why USD payments from other time zones often face a natural delay.
- GBP — CHAPS: The Clearing House Automated Payment System provides same-day sterling settlement through the Bank of England. Payments must be submitted during UK business hours to settle on the same day.
- JPY — BOJ-NET: The Bank of Japan Financial Network System handles high-value yen settlements in real time.
- Other currencies: Most countries operate their own real-time gross settlement systems. Examples include RTGS in India, SAMOS in South Africa, and SPEI in Mexico. Payments in less commonly traded currencies may require additional conversion steps, adding time and cost.
The Settlement Window Matters
Clearing systems do not run around the clock. Each has defined operating hours tied to its domestic business day. A USD payment initiated from Singapore at 3 PM local time arrives at the New York correspondent when Fedwire has already closed for the day, meaning it will not settle until the next US business morning. These time zone gaps are one of the most common reasons international transfers take longer than expected.
Step 5 — Your Money Arrives
Once settlement is complete, the beneficiary’s bank credits the recipient’s account. Depending on the bank’s internal processes, the funds may be available immediately or may be held briefly for additional compliance checks. In most cases, the recipient sees the credit within a few hours of settlement.
Typical Timelines by Corridor
Transfer times vary significantly depending on the currencies involved, the number of intermediaries, and the time zones in play. Here are realistic expectations for common corridors:
- United States to Europe (USD to EUR): 1–2 business days. This is one of the most liquid corridors in the world, with well-established correspondent relationships and overlapping business hours.
- Europe to Europe (EUR to EUR within SEPA): Often same-day or next business day, since both banks may settle directly through TARGET2 without needing a correspondent.
- Europe to Asia (EUR or USD to JPY, SGD, HKD): 2–3 business days. The time zone difference means at least one overnight gap, and an additional intermediary is often required for the currency conversion.
- United States to Latin America: 2–3 business days for major currencies (BRL, MXN), potentially longer for smaller markets.
- Complex corridors (involving exotic currencies or sanctioned regions): 3–5 business days or more. Payments involving currencies with limited convertibility or countries subject to heightened due diligence undergo additional scrutiny at each stage.
These timelines assume everything goes smoothly. In practice, various factors can add delays.
When Things Go Wrong
International payments are remarkably reliable given their complexity, but delays do happen. Understanding the most common causes can help you avoid them or at least anticipate them.
Compliance Holds
Every bank in the payment chain is legally required to screen transactions against sanctions lists, anti-money laundering rules, and counter-terrorism financing regulations. If the sender’s name, the beneficiary’s name, or any field in the MT103 triggers a match — even a partial or false match — the payment is flagged and held for manual review. This process can take anywhere from a few hours to several days, depending on the bank’s compliance team workload and the complexity of the case. Names that are common in certain regions or that resemble entries on sanctions lists are frequent sources of false positives.
Incorrect or Incomplete Details
An incorrect SWIFT code, a mistyped IBAN, a missing address field, or a name that does not match the account holder exactly can all cause a payment to be rejected or returned. Some banks are stricter than others — a minor discrepancy that one institution overlooks may cause another to bounce the payment back. When a payment is returned, the fees already deducted by intermediaries are typically not refunded, meaning you lose money on the round trip. Double-checking every detail before you send is the single most effective way to avoid problems.
Time Zone Gaps
As discussed in the settlement section, clearing systems operate during local business hours. A payment that misses the cut-off time for the destination’s clearing system must wait until the next business day. If you initiate a transfer on a Friday afternoon in a time zone that is ahead of the destination, the payment may not settle until the following Monday or even Tuesday, depending on local holidays.
Public Holidays
Banks observe national holidays, and these do not align across countries. A payment sent on a day that is a business day in your country but a holiday in the correspondent’s country (or the destination country) will be queued until the next working day. During periods like the end of Ramadan, Chinese New Year, or the Christmas-to-New-Year window, multiple banking centres may be closed simultaneously, creating extended delays.
Currency Conversion Delays
If the payment involves a currency exchange, the conversion typically happens at the correspondent bank. During periods of high volatility or low liquidity (early morning hours, weekends approaching), the bank may hold the payment briefly to obtain a favourable rate or wait for the relevant FX market to open.
The Role of UETR
Before November 2018, tracking an international wire transfer was largely a matter of calling your bank and asking them to send a status inquiry (an MT199 message) to the next bank in the chain, which would in turn query the next, and so on. It was slow, opaque, and frustrating.
That changed with the introduction of the UETR — Unique End-to-End Transaction Reference. As part of SWIFT’s Global Payments Innovation (gpi) initiative, every MT103 message now carries a mandatory 36-character identifier in UUID v4 format (for example, eb6305c2-60ed-4a9d-b836-7d82820b37b1). This UETR follows the payment through every bank in the chain, and each institution is required to update the payment’s status in SWIFT’s gpi Tracker database when it processes the transaction.
What UETR Tracking Tells You
With a UETR, you can see:
- Whether the payment has been accepted by the next bank in the chain.
- Whether it is being held for compliance review.
- Whether it has been forwarded to the next intermediary.
- Whether it has been credited to the beneficiary’s account.
- The fees deducted at each stage.
- The FX rate applied if a currency conversion occurred.
Your bank should be able to provide you with the UETR from your MT103 confirmation. If your bank’s online platform does not display tracking information directly, services such as Ohmyfin allow you to look up the status of your transfer using the UETR code, giving you visibility into where your payment is at any given moment without having to call your bank and wait on hold.
The Impact of gpi on Transfer Speed
The gpi initiative has done more than just add transparency. By requiring banks to update the tracker and by publishing performance data, SWIFT has created competitive pressure for faster processing. According to SWIFT’s own data, nearly 50 percent of gpi payments are credited to the beneficiary within 30 minutes, and the vast majority are completed within 24 hours. Banks that consistently lag behind risk losing correspondent banking business to faster competitors.
What You Can Do to Help Your Payment Arrive Faster
While much of the process is outside your control, a few practical steps can reduce the risk of delays:
- Verify the SWIFT code carefully. An incorrect BIC is the most common cause of returned payments. Use a trusted lookup service to confirm the code before you enter it.
- Provide complete beneficiary details. Include the full legal name as it appears on the recipient’s bank account, the complete IBAN or account number, and the beneficiary’s address if your bank requires it.
- Send early in the business day. Payments initiated in the morning have a better chance of catching same-day cut-off times at correspondent banks and clearing systems.
- Avoid sending on Fridays or before holidays. Payments initiated late in the week may not settle until the following week, especially in corridors with significant time zone differences.
- Choose OUR for charges if speed matters. When the sender pays all fees, intermediary banks are less likely to hold the payment while calculating deductions.
- Ask for the UETR. Request the tracking reference from your bank as soon as the transfer is confirmed. This gives you the ability to monitor progress independently.
International wire transfers remain one of the most reliable ways to move money across borders. The process involves multiple institutions, messaging networks, clearing systems, and compliance checkpoints, but each component exists for a reason — to ensure that your funds arrive securely, to the right person, in the right currency, at the right bank. Understanding what happens behind the scenes will not make the wait shorter, but it will make it far less mysterious.