How to Verify a Valid Bank Account

This guide explains how to confirm that a bank account is valid and active, whether you’re setting up direct deposit, issuing a refund, or verifying a vendor’s details. You’ll learn the standard verification methods, what information you need, and how to avoid common mistakes. No special tools are required beyond the account details and, in some cases, a small test transaction.

What You’ll Need

The account holder’s full name (as it appears on the account)
The bank’s routing number (ABA number, 9 digits in the US)
The account number (typically 10-12 digits)
Account type (checking or savings)
Access to the bank’s online portal or a phone to call customer service (if you’re the account holder)
A small amount of money (for micro-deposit verification)

Step-by-Step

Confirm the routing number. The routing number is a 9-digit code that identifies the bank. You can find it on a check (bottom left), on the bank’s website, or by using the ABA routing number lookup tool at aba.com. Ensure the routing number matches the bank name and the state where the account was opened.
Check the account number format. Account numbers vary in length (typically 6-17 digits), but they are usually numeric. Some banks include leading zeros, so keep them. If the account number is on a check, it’s the second set of numbers (after the routing number).
Validate the account number with a checksum (if applicable). For most US banks, the routing number has a checksum (the 9th digit) that you can verify: multiply the first digit by 3, the second by 7, the third by 1, and repeat for the remaining digits, then sum them. The total should be a multiple of 10. This confirms the routing number is valid, but not the account itself.
Perform a micro-deposit verification (recommended). If you’re verifying an account for payments (e.g., linking a bank account to PayPal or a payroll system), the most reliable method is to make two small deposits (usually $0.01 to $0.99) into the account. This requires the account holder to confirm the exact amounts, proving they have access.
Use a bank account verification service. Services like Plaid, Yodlee, or Stripe’s verification tools can instantly verify accounts by logging into the bank’s online portal (with the user’s permission) or by running a real-time check against the bank’s records. These are often used by businesses for ACH payments.
Call the bank (if you are the account holder). If you’re verifying your own account, call the bank’s customer service number (found on the back of your debit card or the bank’s website). They can confirm your account is active and in good standing.
Do a test transaction (for business verification). If you’re a business verifying a vendor’s account, send a small payment (e.g., $1.00) and ask the vendor to confirm receipt. This proves the account is valid and the vendor has access.

Common Mistakes

Confusing routing and account numbers. The routing number is the first 9 digits on a check; the account number is the second set. Transposing them will cause verification to fail.
Ignoring leading zeros. Some account numbers have leading zeros that are part of the number. Omitting them can result in an invalid account.
Using a closed or frozen account. Even if the numbers are correct, the account might be closed or frozen. Verification only confirms the number exists, not that it’s active.
Assuming a valid routing number means the account is valid. Routing numbers are public; anyone can find them. The account number is the key, and it must match the bank’s records.
Not checking the account type. Some banks have different account numbers for checking vs. savings. Using the wrong type can cause a rejection.

Tips

Always double-check the numbers before submitting them. A single digit error can cause a failed transfer.
If you’re verifying a check, look for the check number (usually top right) and the date to ensure the check is recent and not void.
For business verification, use a service that offers real-time verification to avoid manual errors.
If you’re the account holder, enable online banking alerts so you can see micro-deposits immediately.
Keep records of verification attempts (date, method, confirmation number) for your own reference.

Troubleshooting

If the micro-deposits don’t appear within 1-2 business days: Wait 3-5 business days. If they still don’t appear, double-check the account and routing numbers. Sometimes banks delay deposits due to weekends or holidays. If they never appear, the account may be invalid or the numbers are wrong.

If the verification service rejects the account: The service may not support your bank (especially smaller credit unions). Try using a different service or fall back to micro-deposits. Also, ensure the account holder’s name matches exactly what’s on the bank account.

If the bank says the account doesn’t exist: This could mean the account is closed, the number is incorrect, or the account is a different type (e.g., you’re using a savings number for checking). Ask the account holder to re-read the numbers from their check or online banking.

If you’re verifying a foreign account: US verification methods (routing number, ABA) won’t work. You’ll need the IBAN and SWIFT/BIC code for international accounts. Use an international verification service or ask the account holder for a bank statement.

Frequently Asked Questions

Can I verify a bank account without the account holder’s permission?

No. Verifying an account typically requires the account holder’s consent, especially when using services that log into their bank. You can check if a routing number is valid, but the account number itself is private.

Is micro-deposit verification free?

Yes, most banks do not charge for micro-deposits, and the money is usually returned to you within a few days. Some services may charge a small fee for the verification process itself.

How long does micro-deposit verification take?

Usually 1-2 business days for the deposits to appear, then you confirm the amounts. The entire process can take 2-4 days.

What if I only have a voided check?

A voided check contains all necessary numbers (routing, account, check number). You can use it to verify the account by entering the numbers manually or by using an image-based verification service.

Can I verify a bank account using just the card number?

No, a debit card number is different from the account number. You need the actual account number and routing number, which are not printed on the card.

What does ‘valid’ mean exactly?

A valid account means the routing number corresponds to a real bank, the account number exists at that bank, and the account is open and able to receive funds. It doesn’t guarantee the account has sufficient funds.

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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