ABA is your bank's routing number in a different form

ABA stands for American Bankers Association, the organization that created the routing number system. When someone asks for your ABA number, they are asking for your bank's routing number — a nine-digit code that tells the financial system which bank holds your account. The ABA number and the routing number are the same thing; ABA is just the older name for it.

You will see ABA numbers on the bottom left of your checks, in your bank's online portal, or by calling your bank's customer service line. The number looks like this: 021000021 (that is the routing number for Chase Bank in New York). Every bank has its own ABA number, and some large banks have multiple numbers depending on which branch or region processes your transfer.

The ABA number matters because it is how banks route money to the right place. When you send money to someone else's account — whether through a wire transfer, ACH transfer, or direct deposit — the sending bank uses the ABA number to find the receiving bank and deposit the money in the correct account.

Key Takeaways

  • ABA is the abbreviation for American Bankers Association, and the ABA number is the same as your bank's routing number.
  • You need your ABA number whenever you set up direct deposit, receive a wire transfer, or send money to another bank account.
  • The ABA number appears on the bottom left of your checks and in your bank's online banking portal or mobile app.
  • Each bank has its own ABA number, and some large banks have multiple numbers for different regions or processing centers.

Where to find your ABA number

The easiest place to find your ABA number is on a check from your account. Look at the bottom left corner of the check. You will see nine digits printed there — that is your ABA number. The middle eight digits after that are your account number, and the last set of digits is the check number.

If you do not have checks or prefer not to look at them, log into your bank's online portal or mobile app. Most banks display the routing number (ABA number) in the account details section, often under "Account Information" or "Transfer Details." You can also call your bank's customer service number on the back of your debit card and ask for your routing number.

Some banks also print the ABA number on statements or deposit slips. If you cannot find it anywhere, your bank's website usually has a routing number lookup tool where you can enter your city or branch location and get the correct number.

When you need to provide your ABA number

You will need your ABA number in several common situations. If your employer sets up direct deposit, they will ask for your ABA number along with your account number. If you are receiving a wire transfer from someone else, you will give them your ABA number so their bank knows where to send the money.

You also need your ABA number when you set up automatic bill payments through your bank, transfer money between your own accounts at different banks, or receive a tax refund or government payment by direct deposit. Insurance companies, investment firms, and payroll processors all use the ABA number to route money to the right account.

Some online payment services and peer-to-peer apps (like Venmo or PayPal) do not ask for your ABA number because they use different routing methods. But traditional bank-to-bank transfers almost always require it.

How ABA numbers work in the transfer process

When you send money from your bank to someone else's account, your bank reads the ABA number to locate the receiving bank in the Federal Reserve's system. The Federal Reserve maintains a database of all ABA numbers and which banks they belong to. Your bank then sends the transfer instructions to the receiving bank using that ABA number as the address.

The receiving bank uses the account number (the second set of digits you provide) to deposit the money into the correct account within their system. This process happens automatically for ACH transfers (which take one to three business days) and instantly for wire transfers, though wire transfers usually cost a fee.

If you provide the wrong ABA number, the money will go to the wrong bank. Some transfers will bounce back to you, but others may take days to reverse. This is why it is important to double-check the ABA number before you send money, especially for large amounts.

ABA numbers versus account numbers and SWIFT codes

Your ABA number, account number, and SWIFT code are three different pieces of information that work together. The ABA number identifies your bank within the United States. Your account number identifies your specific account within that bank. Together, they tell the financial system exactly where your money should go.

A SWIFT code is different — it is used for international transfers and identifies banks outside the United States. If you are sending money to someone in another country, you will need their bank's SWIFT code instead of (or in addition to) their ABA number. SWIFT codes are longer and include letters, like CHAUSUSXX for Chase Bank.

Some banks also use an IBAN (International Bank Account Number) for international transfers. The IBAN includes the ABA number but adds country and account information in a standardized format. For transfers within the United States, you only need the ABA number and account number.

What to do if you have the wrong ABA number

If you realize you provided the wrong ABA number before the transfer goes through, contact your bank immediately and cancel the transfer. Most banks can stop a transfer if it has not yet been processed, which is usually within a few hours of when you initiated it.

If the transfer has already been sent to the wrong bank, contact your bank and ask them to file a recall request. The receiving bank is not required to return the money, but most will if the sending bank requests it formally. This process can take several business days.

For ACH transfers, you can file a dispute with your bank within a certain timeframe (usually 60 days). For wire transfers, the process is more difficult because wire transfers are generally considered final once sent. This is why it is worth taking 30 seconds to verify the ABA number before you hit send on any large transfer.

Frequently Asked Questions

Is the ABA number the same as the routing number?

Yes. ABA number and routing number are the same thing. ABA is the older term from the American Bankers Association, which created the system. Banks and financial institutions now use "routing number" more often, but they refer to the same nine-digit code.

Do I need an ABA number for transfers between accounts at the same bank?

No. If you are transferring money between two accounts you own at the same bank, you only need your account numbers. The bank already knows where both accounts are. You only need the ABA number when money is moving between different banks.

Can two banks have the same ABA number?

No. Each ABA number is unique to one bank or one processing center within a bank. Some large banks have multiple ABA numbers for different regions or departments, but no two banks share the same number.

What happens if I give someone my ABA number?

Giving out your ABA number alone is safe — it is public information printed on every check. However, do not give your ABA number and account number together to someone you do not trust, because that combination is all someone needs to set up unauthorized transfers from your account.

Do international banks have ABA numbers?

No. ABA numbers are only used by banks in the United States. International banks use SWIFT codes instead. If you are sending money to another country, you will need the receiving bank's SWIFT code, not an ABA number.