The routing number is the nine-digit code at the bottom left of your check, and your account number is the set of digits immediately to its right

Every check has two key numbers printed at the bottom in magnetic ink. The routing number — always nine digits — comes first on the left side. The account number — usually 10 to 12 digits, but varies by bank — comes next. These two numbers tell the banking system where your money is held and which specific account to pull from when someone deposits or cashes your check.

You need both numbers when you're setting up direct deposit for a tax refund, waiting for an insurance payment, or receiving a business reimbursement. The routing number identifies your bank or credit union. The account number identifies your specific account at that bank. Without both, the payment can't reach you.

Key Takeaways

  • The routing number is the first nine digits printed at the bottom left of your check in magnetic ink.
  • Your account number appears immediately after the routing number and is typically 10 to 12 digits long.
  • Both numbers are required for direct deposit of tax refunds, insurance refunds, and other government or business payments.
  • If you can't locate these numbers on a check, your bank's website or customer service can provide them within minutes.

How to read the numbers at the bottom of your check

Look at the bottom of any check you have. You'll see a series of numbers printed in a special dark ink. Read from left to right: the first group of nine digits is your routing number. Immediately after that, you'll see a longer string of digits — that's your account number. Some checks print a third set of numbers at the far right; that's the check number itself and you don't need it for direct deposit.

The magnetic ink and the specific placement matter because banks use automated machines to read these numbers. The routing number always comes first and is always nine digits. The account number length varies — a credit union might use 10 digits while a large bank might use 12 — but it always follows the routing number with no space between them on the printed line.

What the routing number tells the banking system

The routing number is a code assigned by the Federal Reserve to identify your specific bank or credit union. When you provide your routing number to the IRS for a tax refund, to an insurance company for a claim payment, or to an employer for direct deposit, that nine-digit code tells the payment processor exactly which financial institution holds your account. Without it, the system has no way to know where to send the money.

Different branches of the same bank often share one routing number, so the routing number identifies the bank as a whole, not a specific location. If you have accounts at multiple banks, each bank has its own routing number. If you move to a different branch of the same bank, your routing number typically stays the same.

What your account number does

Once the payment reaches your bank using the routing number, the account number tells the bank which of its thousands of customer accounts should receive the money. Your account number is unique to you at that bank. It's the same whether you're receiving a direct deposit, paying a bill online, or setting up an automatic transfer.

The account number is printed on every check you order from that account. If you have a checking account and a savings account at the same bank, each one has a different account number. The account number is not secret in the way a password is — it's printed on your checks and visible to anyone who receives a payment from you — but it does identify your specific account.

Where to find these numbers if you don't have a check

If you don't have a check handy, your bank's website usually displays both numbers in the account details section. Log into your online banking portal and look for "Account Information," "Account Details," or "Routing and Account Numbers." Most banks show both numbers clearly on that page.

You can also call your bank's customer service line — the number is on the back of your debit card or on your bank statements — and ask for your routing number and account number. They'll provide both within a minute or two. Credit unions work the same way: log into your account online or call the member services line on your card.

Common mistakes when providing these numbers for refunds

The most frequent error is transposing digits — writing a 5 as an 8, or reversing the order of two numbers. When you're entering these numbers online for a tax refund or insurance payment, type slowly and double-check each digit against the check or your bank's website. A single wrong digit will send the payment to the wrong account or cause the deposit to fail.

Another mistake is confusing the account number with the check number. The check number is the small number printed at the top right and bottom right of the check — it's not the same as your account number. For direct deposit, you need the account number from the bottom left, not the check number.

Some people also assume that a routing number is the same across all their accounts at one bank. While most accounts at the same bank share a routing number, it's worth confirming on each account if you have multiple accounts. The safest approach is to pull the routing and account numbers from a check or statement for the specific account where you want the refund to land.

Why banks print these numbers in special ink

The magnetic ink used to print routing and account numbers is called MICR ink — Magnetic Ink Character Recognition. Banks use machines to read these numbers automatically when checks are processed. The special ink and the specific placement at the bottom of the check allow high-speed sorting machines to read thousands of checks per hour without human intervention.

This system has been in place for decades and is still the standard for check processing. When you provide your routing and account number for direct deposit, you're giving the payment processor the same information that would be read from a check, which is why the numbers must be exact.

Frequently Asked Questions

Is my account number the same on every check from my account?

Yes. Every check from the same account has the same account number printed at the bottom. The only number that changes on each check is the check number itself, which appears in the top right and bottom right corners.

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

Your routing and account number alone cannot authorize a withdrawal. A thief would also need your signature or access to your online banking login. However, it's still wise not to share these numbers with people you don't trust, since they could attempt unauthorized transfers.

What if the routing number on my check doesn't match what my bank's website shows?

Contact your bank immediately. This is rare but can happen if you have an older checkbook or if your bank merged with another institution. Use the routing number from your bank's website or customer service, not the one on an old check.

Do I need both numbers for every type of payment?

Yes. Tax refunds, insurance payments, stimulus checks, and direct deposit all require both your routing number and account number. Neither number alone is sufficient to direct a payment to your account.

What if I can't find a check and my bank's website is down?

Call your bank's customer service number from the back of your debit card or from a recent bank statement. They can provide your routing and account number over the phone within minutes, even if their website is temporarily unavailable.