The account number is the second set of digits on the bottom of your check, printed between the routing number and the check number

When you look at the bottom left of a check, you see three separate groups of numbers separated by vertical lines. The first group is your routing number (nine digits). The second group is your account number (typically 10 to 12 digits, though this varies by bank). The third group, on the far right, is the check number (usually four to five digits).

The account number identifies your specific deposit account at your bank. When someone deposits your check or when you use it to pay a bill, the account number tells the banking system which account to pull the money from. Without it, the routing number alone cannot direct the payment to the right place.

You may also see your account number printed in the top right corner of the check in regular numerals, but the version at the bottom in magnetic ink character recognition (MICR) format is the one the banking system reads automatically.

Key Takeaways

  • Your account number is the middle set of digits at the bottom of your check, between the routing number and check number.
  • Account numbers are typically 10 to 12 digits long, though the exact length depends on your bank.
  • The account number appears twice on most checks: once in the top right corner in regular print and once at the bottom in magnetic ink.
  • You need both your routing number and account number to set up direct deposit, automatic payments, or wire transfers.

Why banks print the account number in two places

The account number at the bottom of the check is printed in a special format called MICR (magnetic ink character recognition). This allows check-processing machines to read the number automatically without human intervention. The version in the top right corner is there for you to read and reference by hand.

Both numbers are identical—they are the same account number, just displayed in two different ways. The MICR version is what matters when your check is processed through the banking system. The printed version in the corner is what you use when you need to reference your account number for a phone call or form.

How to tell the account number from the check number

The check number is always the shortest group of digits at the bottom right of the check—usually four or five digits. It is also printed larger and in the top right corner of the check. This number changes with each check you write; it is simply a sequential identifier for that particular check.

Your account number stays the same across all your checks. Every check from your account will have the same account number at the bottom, but a different check number. If you are unsure which is which, count the digits: the account number will be longer (10 to 12 digits), while the check number will be shorter (4 to 5 digits).

When you need to provide your account number

You will need your account number when setting up direct deposit for your paycheck, arranging automatic bill payments, or initiating a wire transfer. You will also need it if you are depositing a check remotely through your bank's mobile app—the app will ask you to enter your account number along with the check image.

If someone is paying you by check and asks for your account number to verify the check will go to the right place, you can provide it. However, never share your full account number with someone you do not trust, as it is part of the information needed to access your account.

What to do if your account number is hard to read

If the MICR numbers at the bottom of your check are faded, smudged, or difficult to read, you can find your account number in other places. Log into your online banking portal and look for your account details—your account number will be listed there. You can also call your bank's customer service line and provide your name and other identifying information; they will read your account number to you over the phone.

Your bank statement also displays your account number, usually at the top or in the account summary section. If you have a debit card, the account number may be printed on the back or inside your bank's app. You do not need to order new checks just because the numbers are hard to read—you have other ways to find the information.

Account numbers and routing numbers work together

Your routing number tells the banking system which bank to send the money to. Your account number tells that bank which account within the bank to deposit it into. Both are required for any electronic transfer of funds. Without the routing number, the system does not know which bank to contact. Without the account number, the bank does not know which account to credit.

This is why both numbers appear on your check: they are the two pieces of information the banking system needs to process the payment correctly. When you set up direct deposit or automatic payments, you will be asked for both numbers separately, even though they appear together on your check.

Frequently Asked Questions

Is my account number the same on all my checks?

Yes. Every check from the same account has the same account number printed at the bottom. The check number changes with each check, but the account number stays constant. This is how the bank knows all those checks belong to the same account.

Can someone use my account number to steal money from my account?

Your account number alone is not enough to access your account or transfer money. A person would also need your routing number, and even then, most transfers require additional verification like a password or security code. That said, do not share your full account number with people you do not trust.

What if I give someone the wrong account number?

If you provide an incorrect account number for direct deposit or a payment, the money will go to the wrong account. The sender may be able to recover it, but it can take several days. Always double-check your account number before submitting it, especially for payroll or bill payments.

Does the account number format change between banks?

Account numbers are typically 10 to 12 digits, but the exact length varies by bank. Some banks use 10 digits, others use 12. The format is always a string of numbers with no letters or special characters. Your bank's website or customer service can confirm the exact length of your account number.