Routing numbers are not the same across all banks, and they are not the same for every branch of the same bank
A routing number is specific to the bank and often to the branch where you opened your account. Two people with accounts at the same bank may have different routing numbers if their accounts are held at different branches or if the bank has merged with another bank in the past. The routing number tells the Federal Reserve and other financial institutions exactly where to send money — not just which bank, but which processing center handles your account.
This matters when you set up direct deposit, arrange wire transfers, or receive ACH payments. Using the wrong routing number can delay a refund or payment by days, or send it to the wrong account entirely. The routing number printed on your checks is the one tied to your specific branch, and that is the one you should use for incoming money.
Key Takeaways
- Each bank branch has its own routing number, so two accounts at the same bank may use different routing numbers depending on which branch holds the account.
- The routing number on your checks is the correct one for your account and should be used for direct deposit and incoming payments.
- Merged banks often keep multiple routing numbers active for years after the merger, so an older account may use a different routing number than a newer one at the same bank name.
- You can find your routing number on the first line of your checks, on your bank's website, or by calling your branch directly.
- Using the wrong routing number for a refund or payment can cause delays of several business days or route the money to an unintended account.
How banks assign routing numbers to branches
The Federal Reserve assigns routing numbers to banks and their branches as part of the payment system infrastructure. When a bank opens a new branch or acquires another bank, the Federal Reserve may assign a new routing number or allow the branch to use an existing one. Large banks with hundreds of branches may have anywhere from one routing number for the entire network to dozens of different routing numbers depending on how their processing centers are organized.
Some banks consolidate all branches under a single routing number for simplicity. Others maintain separate routing numbers for different regions or for accounts opened before and after a merger. There is no single rule — it depends on how the bank structured its operations and what the Federal Reserve approved when the bank was chartered or expanded.
Why merged banks keep multiple routing numbers
When one bank acquires another, the Federal Reserve does not immediately retire the old routing number. Instead, both routing numbers often remain active for years. This protects customers who have set up automatic payments or direct deposits using the old number — their payments keep flowing without interruption. Gradually, the bank may migrate accounts to a single routing number, but this can take five years or longer.
If you have an older account at a bank that has gone through mergers, your routing number may be different from someone who opened an account at the same bank name last year. Both numbers work, but they route to different processing centers. This is why the routing number on your checks is always the authoritative one for your account.
Finding the correct routing number for your account
The easiest way to find your routing number is to look at the bottom left corner of any check you have written from that account. The first nine-digit number is your routing number. If you do not have checks, log into your bank's website or mobile app — most banks display the routing number in the account details section, often labeled "Routing Number," "ABA Number," or "Transit Number."
You can also call your bank's customer service line or visit your branch in person. Have your account number ready, and ask specifically for the routing number associated with your account. Do not assume that a routing number you find online for your bank is correct for your account — always verify it against your checks or your account details in the bank's system.
What happens when you use the wrong routing number
If you provide the wrong routing number for an incoming payment like a tax refund or insurance refund, the payment may be delayed by three to five business days while the Federal Reserve tries to locate the correct account. In some cases, the payment goes to a different account at the same bank, and you will need to contact both the sender and your bank to recover it. In rare cases, the payment is rejected entirely and sent back to the sender, who then has to resubmit it.
For outgoing payments like bill payments or transfers you initiate, using the wrong routing number is less likely to cause problems because your bank usually catches the error before the transaction processes. However, it is still worth double-checking before you confirm any payment, especially for large amounts or time-sensitive refunds.
Routing numbers for online banks and credit unions
Online banks and credit unions also have routing numbers assigned by the Federal Reserve. Online banks typically have a single routing number for all customers, since they do not have physical branches. Credit unions may have one routing number for the entire credit union network or separate numbers for different branches, depending on how they are organized.
If you bank with an online institution, the routing number is usually displayed prominently on the website or in the account settings. Credit union members should check their account statements or contact their branch to confirm the correct routing number, especially if the credit union has merged with another in recent years.
Routing numbers and tax refunds
When you file your tax return and request direct deposit of your refund, the IRS uses your routing number and account number to deposit the money into your account. If you provide the wrong routing number, the IRS will attempt to deposit the refund, but it may end up in the wrong account or be returned to the IRS. The IRS then has to reprocess the refund, which can add two to four weeks to the timeline.
Before you file, verify your routing number against your checks or your bank's website. If you are unsure, call your bank and confirm the routing number associated with the specific account where you want the refund deposited. This one step prevents most direct deposit delays.
Frequently Asked Questions
Can I use any routing number for my bank, or does it have to be the one on my checks?
You should use the routing number on your checks or in your account details. While some banks may have multiple routing numbers that technically work, using the wrong one can cause delays or route money to the wrong account. Always verify against your checks or your bank's system before providing it for a refund or payment.
My bank merged with another bank last year. Should I use the old routing number or the new one?
Use the routing number on your current checks or in your account details. After a merger, both routing numbers may remain active, but your account is tied to a specific one. Check your most recent statement or log into your account to confirm which routing number is correct for you.
If I use the wrong routing number for a tax refund, how long does it take to fix?
If the refund goes to the wrong account, the IRS will eventually recover it and reprocess it to the correct account. This can add two to four weeks to the overall timeline. Contact the IRS as soon as you realize the error so they can prioritize the correction.
Do credit unions have different routing numbers than banks?
Credit unions have their own routing numbers assigned by the Federal Reserve, separate from bank routing numbers. If you have an account at a credit union, use the routing number provided by your credit union, not a bank routing number. The format is the same — nine digits — but the numbers are different.
Where do I find the routing number if I bank online and do not have checks?
Log into your online banking account and look for account details or settings. Most online banks display the routing number there. You can also call customer service or check your account statements. Do not rely on a routing number you find through a general web search — always verify it in your account or by calling your bank directly.