What is ABA Number?

Question

What is ABA Number?

Accepted Answer

The **ABA Number**, also known as the **ABA Routing Transit Number (RTN)**, is a unique nine-digit code assigned by the American Bankers Association (ABA) to identify specific financial institutions in the United States for the purpose of facilitating payment transactions, primarily through the Automated Clearing House (ACH) network and wire transfers.

ABA Number

What is ABA Number?

What is the specific nine-digit structure of an ABA Number and how is the final digit used for validation?

How do ABA Numbers differ when used for ACH transfers versus domestic wire transfers, and what are the implications for payment processing speed and cost?

Why is the ABA Number a critical component in the U.S. payments infrastructure, and what are the risks associated with using an incorrect or outdated number?

When was the ABA Number system established, and how has its role evolved with the rise of modern digital payment systems like real-time payments (RTP)?

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