Your checking account number appears in the bottom left corner of every check you write

The account number is printed in the lower left section of your check, right after a colon that follows a series of digits. It is typically 10 to 12 digits long and identifies your specific account at your bank. This number stays the same for as long as you hold that account, even if you order new checks.

The account number is separate from your routing number, which appears just to its left. Both numbers work together when a check is processed, but they serve different purposes. 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 should receive or send the funds.

You will see the account number printed in magnetic ink, the same dark material used for the routing number. This makes it machine-readable when checks are processed at banks and clearing houses.

Key Takeaways

  • Your account number is located in the bottom left corner of your check, printed after the routing number and a colon.
  • The account number is typically 10 to 12 digits long and remains the same throughout the life of your account.
  • Account numbers are printed in magnetic ink so they can be read by check-processing machines at banks.
  • You need your account number when setting up direct deposit, automatic bill payments, or wire transfers from your account.

How to read the numbers at the bottom of a check

The bottom of a check contains three separate sets of numbers, each with a specific function. Reading from left to right, you will see the routing number first, then the account number, and finally the check number on the far right.

The routing number is always nine digits and identifies your specific bank or credit union. After the routing number, there is a colon or space, followed by your account number. The account number is longer—usually 10 to 12 digits—and is unique to your account. At the far right, separated by another colon, is the check number, which corresponds to the number printed in the upper right corner of the check itself.

If you have trouble locating these numbers, look at the very bottom edge of the check where the print is smallest. The numbers are aligned in a single row and printed in a special magnetic ink that looks slightly raised or darker than regular printing.

Why banks print your account number on checks

Banks print your account number on every check so that the check-processing system can automatically route your payment to the correct account. When you write a check and the recipient deposits it, their bank scans the magnetic numbers at the bottom. Those numbers tell the clearing house exactly which bank and which account the money should come from.

Without the account number printed on the check, bank employees would have to manually enter account information for every single check processed. This would slow down the entire banking system and create far more opportunities for errors. The printed numbers allow the process to happen automatically and accurately, often within one business day.

The account number is also printed on your checks for your own reference. If you need to provide banking information to set up direct deposit, automatic payments, or wire transfers, you can straightforward look at your check rather than calling your bank or logging into your account online.

When you need to provide your account number

You will need to provide your account number in several common situations. If your employer offers direct deposit, you will give them your routing number and account number so they can deposit your paycheck directly into your account. Similarly, if you want to set up automatic bill payments through your bank, you will need to provide your account number to the biller.

When you receive a wire transfer or an ACH transfer from another person or organization, you will need to give them your account number along with your routing number. You may also need your account number if you are setting up a payment plan with a creditor or receiving a tax refund that you want deposited directly into your account.

In most cases, you only need to provide your routing number and account number—you do not need to give out your full check number or any other information printed on the check.

What information should you keep private

Your account number itself is not considered highly sensitive information on its own. Banks and businesses regularly ask for it, and it appears on documents you may share. However, you should not write your account number on anything you plan to leave behind or mail without thinking about who might see it.

The information you must protect is your account number combined with your routing number, along with any other identifying details about your account. If someone has both your routing number and account number, they can potentially set up unauthorized transfers or payments from your account. This is why you should be cautious about sharing check information with people or organizations you do not trust.

Never share a photo of a blank check or a check you have written with anyone online or through unsecured channels. If you need to provide banking information to a company, call them directly using a phone number from their official website rather than clicking a link in an email or text message.

Finding your account number if you do not have checks

If you have not ordered checks yet or your checks have run out, you can still find your account number in several places. Log into your online banking portal or mobile app—your account number is typically displayed on the account summary page or in your account settings. You can also call your bank's customer service line and ask them to provide your account number over the phone.

Your account number may also appear on your bank statements, either printed at the top or bottom of the page. If you receive paper statements in the mail, look for it there. Some banks also print the account number on your debit card, though not all do.

If you need your account number urgently and cannot access your online account, visiting your bank branch in person is the fastest option. A teller can provide your account number and routing number when ready.

Frequently Asked Questions

Is my account number the same as my debit card number?

No. Your account number and debit card number are different. Your account number identifies your specific account at the bank and is used for transfers and direct deposits. Your debit card number is tied to your card itself and changes if you order a replacement card. You can find your account number on your checks or in your online banking portal.

Can someone steal money from my account if they only have my account number?

Having only your account number is not enough to steal money, but it is part of what someone would need. A person would also need your routing number to set up an unauthorized transfer or payment. If someone has both numbers, they could potentially create problems, which is why you should not share your full banking information with people you do not trust.

What if the numbers at the bottom of my check are smudged or hard to read?

If the magnetic numbers on your check are unclear, you can still find your account number through your bank. Log into your online account, call customer service, or visit a branch. You can also order new checks from your bank, which will have clear, properly printed numbers. Do not attempt to write in or alter the numbers yourself.

Do I need to memorize my account number?

You do not need to memorize it, but it is helpful to know where to find it quickly. Write it down and keep it in a safe place, or save it in a password-protected note on your phone. Having it readily available makes it easier to set up direct deposit or provide information to your bank without having to search for a check or log into your account.