Your account number is on the bottom left of the check, after the routing number
The bottom of every check shows three separate numbers in magnetic ink. Reading left to right, you see the routing number first (nine digits), then your account number (usually 10 to 12 digits), then the check number (three to four digits on the right). Your account number is the middle set of digits — the one that identifies your specific checking account at your bank.
The account number stays the same for every check you write from that account. If you switch banks or open a new account, you get a new account number. The routing number, by contrast, stays the same for all accounts at the same bank branch.
You can also find your account number on your bank statement, your debit card, your online banking login, or by calling your bank's customer service line. But the check itself is the fastest place to look if you have one in front of you.
Key Takeaways
- Your account number appears on the bottom of the check in the middle position, between the routing number and the check number.
- The account number is typically 10 to 12 digits long and identifies only your individual account.
- Every check from the same account carries the same account number, even though each check has its own unique check number.
- If you do not have a check available, your bank statement or online banking portal will show your account number.
How to read the numbers in order
The magnetic ink line at the bottom of a check always follows the same pattern. Start from the left side and move right. The first group of nine digits is your bank's routing number — this tells the Federal Reserve and other banks where to send the money. The second group, which comes immediately after, is your account number. The third group on the far right is the check number, which appears in two places on the check (also in the top right corner in regular print).
This order never changes, no matter which bank you use or what style of check you have. Personal checks, business checks, and cashier's checks all follow the same layout. The magnetic ink makes these numbers machine-readable so that check-processing equipment can sort and route them automatically.
Why you need to know where it is
You may need your account number to set up direct deposit for paychecks or government payments, to arrange automatic bill payments, or to give to someone who needs to send you money via bank transfer. Some employers ask for it on a form; some government agencies ask for it when you register for a payment program. Having it written down or knowing where to find it saves time.
You should never share your account number with someone you do not trust, since it can be used to set up unauthorized transfers or payments from your account. Your routing number is public information (it identifies the bank, not your account), but your account number is private. If you are giving your account number to a business or government agency, make sure you initiated the request and that you recognize the organization.
Finding your account number without a check
If you do not have a check in front of you, your bank statement shows your account number at the top or in a summary section. Log into your online banking account and look for "Account Details" or "Account Information" — your account number will be listed there. You can also call your bank's customer service number (on the back of your debit card or on your bank's website) and give them your name and date of birth; they will read your account number to you over the phone.
Some banks also print your account number on your debit card, though not all do. Check the front or back of your card to see if it appears there. If you have a savings account at the same bank, it will have a different account number from your checking account, even though both use the same routing number.
What happens if you give someone the wrong number
If you accidentally give someone a digit or two wrong, the payment may bounce or be rejected before it goes through. Banks use a check-digit algorithm to verify that account numbers are valid, so a typo usually stops the transaction rather than sending money to the wrong place. The person sending the money will get a notice that the account number is invalid and can ask you for the correct one.
If a payment does go to the wrong account by mistake, the receiving bank can usually reverse it, but it takes time and paperwork. The safest approach is to double-check the number before you give it out — read it aloud to the person asking for it, or have them read it back to you to confirm.
Checks from joint accounts and business accounts
If you have a joint checking account with another person, there is only one account number for that account, and both of you use the same checks. The account number does not change based on who writes the check. Business checking accounts work the same way — the account number belongs to the business, not to the individual who signs the check.
If you are an authorized user on someone else's account, the checks you write will show that account's number, not a separate one for you. This is why account numbers are sensitive information — anyone with your account number and routing number can potentially set up payments or transfers from your account.
Frequently Asked Questions
Is my account number the same as my routing number?
No. Your routing number identifies your bank (or your bank's branch), and it is the same for all customers at that bank. Your account number identifies your specific account at that bank. Together, they tell the banking system exactly where to send money.
Can someone steal money if they have my account number?
They would need both your account number and your routing number to set up a transfer or payment. Even with both, most banks require additional verification before processing large transfers. Never share your account number with someone you do not know or trust, but do not panic if you accidentally give it to a legitimate business or government agency.
Why are there different numbers on the front and back of my check?
The numbers printed in regular ink on the front and top right (routing, account, and check number) are for human reading. The magnetic ink numbers on the bottom are for machines. They are the same numbers — just printed twice in different formats.
Do I need my account number to deposit a check?
No. When you deposit a check into your own account, the bank already knows your account number. You only need to write your account number on the back of a check if someone else is depositing it into their account on your behalf, which is rare.
What if my checks do not have the magnetic ink numbers?
All standard checks issued by banks have the magnetic ink line at the bottom. If your checks are missing it, contact your bank — they may have printed them incorrectly, or you may have received a non-standard check style. Your bank can issue replacement checks or confirm your account number another way.