An ABA routing number is a nine-digit identifier used to identify a US financial institution in supported payment and check-processing contexts. It helps route the instruction to the correct institution. It does not identify the customer’s individual account and may differ by payment type or processing location.
Where is an ABA routing number used?
- ACH credits and debits
- Domestic wire instructions when the bank specifies it
- Paper and electronic check processing
- Direct deposit and eligible bill-payment instructions
How is it different from an account number?
The routing number identifies the financial institution or processing endpoint. The account number identifies the customer account within that institution. Both may be required, together with the account-holder name and account type.
ABA routing number vs. SWIFT code
An ABA routing number is used in US domestic contexts. A BIC or SWIFT code identifies an institution in international financial messaging. An international payment can require correspondent or beneficiary information beyond either identifier.
What should be verified?
Use the instructions supplied by the beneficiary or institution for the exact payment type. Do not assume a routing number printed on a check is valid for every wire or ACH use. Verify changes through an approved contact channel before releasing funds.
