Finance glossary

How to check an account number? Account number verification

Bristol James
4 Min

Bank account number verification is an important part of fraud prevention. It also ensures the accuracy of financial transactions and, more broadly, protects the personal details of both individuals and businesses.

Here are some best practices on how to check (and verify) an account number.

What is an account number?

An account number is a unique identifier assigned to a specific bank account or financial institution. While some account numbers feature up to 17 digits, the typical length is between 8 and 12 digits.

The account number works with other identifiers to ensure funds are sent to the intended recipient.

These include:

  • The routing number – used in the United States to identify specific banks, and
  • The international bank account number (IBAN) – for international transfers.

How to find a bank account number

There are various ways to find a bank account number depending on the context and type of payment involved.

Bank statements

On a bank statement, the account number can be found at the top above the list of recent transactions.

Some statements will also have an “Account Details” section with important information (such as checking account number) in one place.

Checks

Account numbers also appear at the bottom of a paper check (usually between the routing number and the check number).

How to read a check

Online banking

Accessing your bank account online or via a mobile app will also reveal the account number.

Look under “Account Details” or “Account Summary” or “Profile Settings” on the home screen or dashboard.

Account number verification tools and services

In some cases, it is possible to utilise specialised tools and services to verify account numbers.

Customers of some banks can verify account numbers over the phone. However, it should be noted that these services do not provide the account holder’s name.

Other banks offer verification services to ensure that the account number entered for a payment matches the one held by an individual or business.

Commonwealth Bank’s NameCheck is one example. It searches available payment data for a match and is relevant to customers making a first-time payment in Netbank.

If no match is found, the customer is prompted to take additional steps to verify the intended recipient.

Banks also use third-party account verification services such as Plaid and Yodlee. These services offer APIs that connect to a bank’s platform and verify account ownership before payments are processed.

Despite banks offering these services, there is still a high risk for consumers and businesses to become victims of fraud or potential human error. It’s always important to verify account numbers, especially when it comes to paying invoices for suppliers. Many companies will lean into a payment verification technology, like Eftsure, to bring the risk of payment error down to a minimum.

ACH verification

Before a payment is approved on the Automated Clearing House (ACH) network in the United States, a zero-dollar test transaction is sent to verify that the bank account number, routing number and other details are correct.

ACH file validation is another verification process that checks for the accuracy and completeness of data in a payment before it is submitted.

This step ensures that the information provided (such as the bank account number, routing number, transaction amount and payment details) complies with the necessary formatting and structural rules set by NACHA – the overseer of the ACH network.

IBAN verification

For international transfers, several online tools can confirm whether the IBAN is valid. Since the IBAN is a relatively long string of letters and numbers, it is often entered incorrectly in the payment process.

How to read an IBAN number
The components of an IBAN that must be validated (Source: Genome)

The validation process for an IBAN comprises six steps:

  1. Data cleansing – where all non-alphanumeric characters are removed.
  2. Checksum verification – the primary integrity check for IBAN transactions which is performed by algorithms.
  3. Account number check – country-specific validation algorithms then verify account number details. At present, 116 countries are supported.
  4. IBAN length verification – the total length of the IBAN is checked based on the specific country standard.
  5. Format/structure – where the number’s components are checked to ensure they’re in the correct positions and format.
  6. Bank directory lookup – in the final step, the issuing bank and country are verified using the Bank Identifier Code (BIC) and Single Euro Payments Area (SEPA) standardised payment scheme.

Summary:

  • To check an account number, individuals can cross-reference data found on bank statements, checks and online banking platforms. Most account numbers are in the range of 8 to 12 digits, but some are longer.
  • Account number verification is the process of confirming that a particular account number is valid, active and correctly associated with a specified account holder.
  • Transactions on the ACH network are verified by test transactions and file validation, while international transfers that utilise IBANs are verified in a six-step process with specialised validation algorithm

 

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