The account number is the second set of digits on the bottom left of your check, printed between the routing number and the check number
On a standard check, three separate numbers appear along the bottom in magnetic ink. From left to right, they are: the routing number (nine digits), your account number (typically 10 to 12 digits, though this varies by bank), and the check number (usually four to five digits). Your account number identifies which specific account at your bank the check is drawn from.
The account number is always longer than the routing number and always comes after it. If you see 9 digits, that is the routing number. If you see 10 to 12 digits when ready following, that is your account number. The shortest number on the right is the check number.
Not all checks display these numbers in the same visual order or spacing, but the magnetic ink order is always the same. Some checks print the account number in larger or bolder type, and some banks print it again elsewhere on the check for readability, but the official version for payment processing is the one in the magnetic ink line at the bottom.
Key Takeaways
- Your account number appears as the second set of digits in the magnetic ink line at the bottom of the check, after the nine-digit routing number.
- Account numbers are typically 10 to 12 digits long, but the exact length depends on your bank.
- The three numbers in order are routing number, account number, and check number — never in any other sequence.
- Some banks print the account number in other places on the check for convenience, but the magnetic ink version is what payment systems read.
Why the order matters for payment processing
When a check is processed, a machine reads the magnetic ink numbers in sequence. The routing number tells the payment system which bank to send the money to. The account number tells that bank which account within the bank to debit. The check number is a reference for your records and the bank's records, but it does not direct the payment itself.
If you write down your account number from a check, you must copy it from the magnetic ink line in the correct order. Copying it from somewhere else on the check, or from a statement, will give you the right number but not necessarily in the format the payment system expects. The magnetic ink line is the source of truth.
How to read the magnetic ink line if the numbers are unclear
Older checks, worn checks, or checks printed on unusual paper can make the magnetic ink numbers hard to read. If you cannot clearly see the account number on your check, do not guess — contact your bank directly. You can call the number on the back of your debit card, your bank's website, or visit a branch.
Your bank can tell you your account number in seconds and confirm it matches the check in your hand. They can also confirm the routing number. This is faster and more reliable than trying to decipher faded ink, and it costs nothing.
If you need your account number for a one-time payment or transfer, your bank statement will also show it — usually at the top of the page or in the account information section. Statements are often easier to read than checks.
Account numbers on different check types
Personal checks, business checks, and cashier's checks all follow the same format for the magnetic ink line. The routing number, account number, and check number appear in the same order and the same position on the bottom left. The only difference is that a cashier's check is issued by the bank itself, so the account number belongs to the bank, not to you.
Starter checks (blank checks with no pre-printed information) will not have any of these numbers until your bank prints them. If you order checks from your bank, the routing number and account number will be printed automatically in the magnetic ink line. If you order checks from a third-party printer, you must provide your routing number and account number so they can be printed correctly.
Common mistakes when locating the account number
The most common mistake is confusing the account number with the check number. The check number is much shorter — usually four or five digits — and appears on the right side of the magnetic ink line. It is also printed in the top right corner of the check in regular ink. Do not use the check number when you need your account number.
Another mistake is reading the numbers in the wrong order. If you see three groups of digits in the magnetic ink line, remember: left to right is routing, account, check. If you write them down in reverse order or skip the middle number, the payment will not process correctly.
Some people also confuse the account number with the account number printed in regular ink elsewhere on the check. While these should match, the magnetic ink version is what the payment system reads, so that is the one to use for any transaction.
What to do if your check does not have a magnetic ink line
Standard checks always have a magnetic ink line at the bottom. If a check does not have one, it is not a valid check for processing through the banking system. This sometimes happens with novelty checks, ceremonial checks, or checks printed incorrectly.
If you receive a check without a magnetic ink line, contact the person or organization that issued it and ask for a replacement. If you are trying to print your own checks and they do not have the magnetic ink line, contact your bank or your check printer — the magnetic ink is required for the check to be processed.
Frequently Asked Questions
Is my account number the same on every check I have?
Yes. Every check from the same account at the same bank will have the same account number in the magnetic ink line. If you order new checks, the account number will remain the same unless you close the account and open a new one.
Can someone use my account number if they see it on a check?
Your account number is visible to anyone who handles a check you write, so it is not secret. However, they also need your routing number (which is public information for your bank) to send money from your account. Most banks also require additional verification before processing a transfer. If you are concerned about a specific check, contact your bank.
What if the magnetic ink numbers are printed in a different order on my check?
They should not be. The standard order is routing number, account number, check number from left to right. If your check has them in a different order, contact your bank — the check may not process correctly, and you may need a replacement.
Do I need my account number to deposit a check?
No. When you deposit a check, the bank reads the magnetic ink line automatically, which includes your account number. You do not need to write it down or provide it separately. If you are depositing by mail or mobile app, the system will read the numbers from the check itself.
Where do I find my account number if I do not have a check?
Your account number appears on your bank statement, in your online banking portal, on your debit card (sometimes), and on any documents your bank sent you when you opened the account. You can also call your bank or visit a branch to ask for it.