Analysis of IBAN and SWIFT Codes in the United States: Differences and Usage Guide

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Key Note: If you’re searching for a US bank’s IBAN number, you can stop looking. The US banking system does not use IBAN at all.

When making international transfers to the US, what you really need are the SWIFT code (also known as BIC) and the ABA Routing Number. Understanding these codes is the first step to a successful transfer. Our SWIFT code analysis will clear up any confusion, ensuring your funds reach their destination smoothly.

Key Points

• US banks do not use IBAN. You do not need an IBAN when transferring money to the US.
• Transfers to the US require a SWIFT code and an ABA Routing Number. The SWIFT code identifies the bank, while the ABA number guides funds within the US.
• The SWIFT code is a globally recognized bank identifier. It consists of 8 or 11 characters.
• The ABA Routing Number is used only in the US. It is a 9-digit number for domestic transfers.
• Before transferring, carefully verify the recipient’s name, address, bank name, SWIFT code, ABA number, and account number. Ensure all information is accurate.

Why Doesn’t the US Use IBAN?

You might wonder why a financial powerhouse like the US doesn’t use an internationally standardized system. The answer is simple: the US established a robust and efficient domestic clearing system long before IBAN was introduced.

IBAN Background and Standards

The International Bank Account Number (IBAN) was originally developed to standardize payment processes in the European Union. It follows the ISO 13616 standard, designed to provide each bank account with a unique, verifiable identifier to enable automated processing of cross-border payments and reduce errors. Today, over 80 countries have adopted IBAN, primarily in Europe, the Middle East, and parts of the Caribbean.

Fun Fact: IBAN was designed to facilitate automated data processing, but it does not handle the routing of transfer paths.

The US Domestic Clearing System

Unlike European countries, the US has two long-established payment networks:

• Fedwire: A real-time gross settlement system operated by the Federal Reserve, primarily handling large-value, time-sensitive payments.
• ACH (Automated Clearing House): Established in the 1970s to replace paper checks, efficiently processing batch payments like payroll and bill payments.

These two systems have been highly successful in the US, forming the backbone of its financial infrastructure. As a result, the US had little incentive to replace this mature system with the IBAN standard.

A Common Transfer Misconception

Many senders, accustomed to using IBAN for European transfers, mistakenly assume it’s a global standard. When transferring to the US, they often face issues such as:

• Feeling confused about what to enter in the IBAN field on transfer forms.
• Incorrectly entering the recipient’s account number or ABA number in the IBAN field.

Note: Providing incorrect or improperly formatted recipient information is the primary reason for delays or rejections of international transfers. Filling the IBAN field with a US bank’s account information will almost certainly cause your transfer to fail.

SWIFT Code Analysis: Definition, Structure, and Uses

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When transferring money to the US, the SWIFT code is an essential piece of information. It acts as the bank’s “international postal code,” ensuring your funds are accurately routed to the correct financial institution. This section’s SWIFT code analysis will help you fully understand its role.

SWIFT Code Definition and Function

The SWIFT code, officially known as the Bank Identifier Code (BIC), is interchangeable with BIC. It is not an account number but a standardized code used globally to identify a specific bank.

SWIFT itself is a vast financial messaging network that does not hold or transfer funds. Its core function is to securely transmit payment instructions. This network connects over 11,000 financial institutions across more than 200 countries and territories, processing tens of millions of financial messages daily, serving as the communication backbone of the international financial system. When you initiate an international transfer, your bank uses the SWIFT network to send payment instructions to the recipient bank.

SWIFT Code Structure Analysis

A standard SWIFT code consists of 8 or 11 characters, with each part having a specific meaning. Let’s analyze a Bank of America SWIFT code, BOFAUS3N, as an example:

• Bank Code (First 4 Characters): BOFA - Represents the unique code for the financial institution, here Bank of America.
• Country Code (Characters 5-6): US - Indicates the bank’s country, here the United States.
• Location Code (Characters 7-8): 3N - Identifies the city or region of the bank’s headquarters.

Tip: An 8-character SWIFT code typically points to the bank’s head office. To specify a particular branch, an 11-character code is used, with the last three characters being the branch code. For example, in BOFAUS3NXXX, XXX denotes the head office. Through this SWIFT code analysis, you can accurately identify the recipient bank.

How to Find a Bank’s SWIFT Code

Obtaining the correct SWIFT code is critical to ensuring a successful transfer. You can use the following reliable methods:

1. Ask the Recipient Directly: This is the most straightforward and accurate method. Ask your recipient to contact their bank to obtain the correct SWIFT code for international transfers.
2. Check Bank Documents: SWIFT codes are often printed on bank monthly statements.
3. Visit the Bank’s Website: Many banks list their SWIFT codes on their “International Transfers” or “FAQ” pages.
4. Use Online Tools: You can also use the BIC search tool provided by the SWIFT official website or reliable third-party financial service websites to look up and verify SWIFT codes.

Before transferring, always double-check the SWIFT code you’ve obtained to avoid unnecessary delays or extra fees.

SWIFT, IBAN, and ABA: Key Differences

Now that you understand the SWIFT code, to truly master international transfers, you need to distinguish it from IBAN and ABA numbers. While all three codes are used for transfers, their functions and use cases are entirely different. The following comparison provides a clear framework, forming the core of this SWIFT code analysis guide.

Functions and Identification Targets

Each code plays a unique role, identifying different financial entities.

• SWIFT Code (BIC): Its function is to identify financial institutions. Think of it as a bank’s “passport” in the international financial network, ensuring payment instructions reach the correct bank globally.
• IBAN: Its function is to identify individual bank accounts. It provides a unique, verifiable number for each account in Europe and other adopting countries, directly pointing to the recipient’s specific account.
• ABA Routing Number: Its function is to identify banks within the US. This nine-digit code is used for domestic fund clearing in the US, such as direct deposits and wire transfers, ensuring funds flow accurately within the US banking system.

Geographic Scope and Format

The geographic scope and formats of these codes are distinctly different.

• SWIFT Code: Globally used, consisting of 8 or 11 alphanumeric characters.
• IBAN: Used in over 80 countries, primarily in Europe, the Middle East, and parts of the Caribbean. It consists of up to 34 alphanumeric characters, including country code, check digits, and account information.
• ABA Routing Number: Used only in the US, with a fixed format of 9 digits.

Core Comparison of the Three Codes

To make it clearer, we’ve summarized their key differences in a table.

Special Note: IBAN’s Advantage IBAN’s format is highly structured, incorporating check digits. This allows transfer systems to validate an IBAN’s correctness before initiating a transaction. This mechanism greatly reduces the risk of transaction failures due to incorrect account details, making payment processing faster and safer.

Guide to Transferring Money to the US

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With the theoretical knowledge in hand, let’s move to practical steps. Follow this guide to prepare and execute transfers to the US like a pro, ensuring every step is accurate.

Required Information Checklist

When preparing to transfer money to the US, you need to obtain a complete and accurate information checklist from the recipient. Missing any item could lead to delays or transfer failures. Ensure you have the following information:

• Recipient’s Full Legal Name: Must match the name on the bank account exactly.
• Recipient’s Full Address: Including street, city, state, and ZIP code.
• Recipient’s Phone Number: Sometimes banks need to contact the recipient for verification.
• Recipient’s Bank Name: For example, Bank of America, Chase Bank, etc.
• Bank SWIFT Code (BIC): Used to identify the bank internationally.
• ABA Routing Number: Used for routing funds within the US.
• Recipient’s Account Number: Ensure it is accurate.

Special Note: When initiating a transfer from mainland China or Hong Kong banks, transfer forms typically require both the SWIFT Code and ABA Routing Number. Both pieces of information are critical for ensuring smooth fund clearing.

After you’ve validated the checklist, BiyaPay can help you execute the payment with fewer errors and clearer steps.

BiyaPay is a multi-asset wallet covering cross-border payments and asset management, and it offers practical, transfer-oriented tools: a SWIFT lookup to confirm the bank identifier, an IBAN lookup for countries that use IBAN, and a currency converter to estimate costs before you submit the payment. When you’re ready, follow the same fields outlined in this guide on BiyaPay’s Remittance page—recipient name, bank name, SWIFT, ABA routing number, and account number—so you don’t accidentally place the ABA number in the SWIFT field.

BiyaPay operates in multiple jurisdictions under relevant registrations (including US MSB and New Zealand FSP), and its flow emphasizes correctness and upfront validation, helping reduce returns or delays caused by formatting issues or missing details.

The Role of the ABA Number

You might wonder why an ABA Number is needed when you already have a SWIFT Code to identify the bank internationally.

The answer lies in the US’s unique payment system. Here’s how to understand it:

1. SWIFT Code’s Role: Guides your funds from the sending bank (e.g., a licensed Hong Kong bank) to the correct recipient bank in the US (e.g., JPMorgan Chase). Its job ends there.
2. ABA Number’s Role: Once the funds reach the US, the ABA Number takes over. It acts like a domestic postal code, directing funds within the US’s vast banking network to the specific branch or processing center where the recipient’s account is held.

Important Tip: Not All ABA Numbers Are Universal US banks may use different ABA Numbers for different types of transfers. For example, the number for ACH (Automated Clearing House) transfers may differ from the one for wire transfers. For international transfers, you must request the ABA Routing Number specifically for wire transfers, not for ACH or paper checks. The recipient can find this nine-digit number on their online banking, bank statements, or the bottom left of their checkbook.

Checklist for Requesting Information

To avoid back-and-forth communication, send your US recipient a clear checklist to gather all necessary information at once. You can copy the following questions:

• What is the full legal name used on your bank account?
• What is your complete residential address (including ZIP code)?
• What is the full name of your bank?
• What is the SWIFT Code for international wire transfers?
• What is the ABA Routing Number for wire transfers?
• What is your bank account number?

After receiving this information, double-check for spelling or numerical errors.

Common Mistakes When Filling Out Transfer Forms

Even with complete information, a small oversight when filling out forms can cause significant issues. Here are the most common mistakes to avoid:

• Recipient Name Mismatch: Minor spelling errors, such as writing “John Smith” as “Jonh Smith”, may sometimes succeed but are likely to trigger a bank’s security review, causing delays. If the name is completely incorrect, the bank will halt the transfer until resolved.
• Incorrect ABA Number or Account Number: This is the most dangerous mistake. If you enter a valid but incorrect account number belonging to someone else, funds may be deposited, and recovery can be extremely difficult, requiring the other party’s consent and potentially taking weeks. If the number is invalid, the transfer will be returned, but you may lose transaction fees, and funds may take 3 to 14 business days to return to your account. According to LexisNexis Risk Solutions, each failed payment incurs an average additional cost of about $12.00.
• Confusing SWIFT Code and ABA Number: Through our previous SWIFT code analysis, you know their differences. However, in practice, entering the 9-digit ABA Number in the SWIFT Code field is a common error. Always ensure the correct information is entered in the appropriate field.
• Missing Necessary Special Instructions: If you’re transferring money for tuition or a property deposit, failing to include a student ID, contract number, or payment purpose in the memo or reference field may prevent the recipient (e.g., a university or lawyer) from identifying the funds, causing significant delays.

Before clicking the “Confirm Transfer” button, take one minute to review all information again—it’s the simplest and most effective way to ensure your funds’ safety.

When transferring to the US, forget about IBAN. Your successful transfer depends on three key pieces of information: the correct SWIFT Code, ABA Routing Number, and recipient account number.

Verifying information is your most critical task. International wire transfers typically take 1-5 business days to arrive, and any minor error can cause delays or returns.

Safety Tip: Never accept changes to recipient information via email alone. Before transferring, always confirm all details directly with the recipient via phone or another secure method.

By following the steps in this guide, you can ensure your funds reach the recipient quickly and accurately.

FAQ

What should I fill in the IBAN field on a transfer form?

You should leave the IBAN field blank. US banks do not use IBAN. Entering an account number or ABA number in this field will almost certainly cause the transfer to fail or be delayed.

Can I provide only the SWIFT code without the ABA number?

No. When transferring from mainland China or Hong Kong, banks typically require both pieces of information. The SWIFT code directs funds to the US bank, while the ABA number ensures the funds reach the correct branch within the US.

What happens if I enter incorrect recipient information?

Your transfer may be returned, but you may lose transaction fees. It can take several business days for funds to return to your account. Industry reports indicate that each failed transaction incurs an average additional cost of about $12.00.