An external bank account is any bank or financial account you own that is not at the bank you are currently dealing with
When a bank asks for your "external account" information, they mean a checking or savings account at a different financial institution. If you bank at Chase and have a savings account at a credit union, that credit union account is external to Chase. Banks ask for this information for three main reasons: to verify your identity, to process transfers between institutions, and to check your financial history before lending you money or opening a new account.
The term "external" is relative to the bank asking the question. The same account can be external to one bank and internal to another. What matters is which institution you are talking to at that moment.
Key Takeaways
- An external account is any bank account you own at a different financial institution than the one you are currently working with.
- Banks ask for external account information to verify your identity, set up transfers, and review your financial history before making lending decisions.
- You do not have to link an external account to open a new bank account, but doing so can speed up verification and transfers.
- Linking an external account requires you to prove you own it, usually by confirming small deposits the bank sends to that account.
Why banks ask for external account details
Banks request external account information during account opening, loan applications, or when you want to move money between institutions. The most common reason is identity verification. If you provide an external account number and routing number, the bank can confirm those details match public records and reduce the risk of fraud or identity theft.
A second reason is to enable automatic transfers. If you want to move money from your new bank account to an external account regularly—say, to pay a loan or fund an investment account—the bank needs your external account details to set up that connection. Without them, you would have to initiate each transfer manually or use a slower method like a check.
The third reason is financial review. When you apply for a loan, credit card, or mortgage, the lender may ask for external account information to see your banking history at other institutions. This gives them a fuller picture of your spending, savings, and financial stability than your account with them alone would show.
How to link an external account safely
Linking an external account means giving one bank permission to connect to an account you hold elsewhere. The process usually starts with you providing the account number and routing number of the external account. The routing number identifies the bank; the account number identifies your specific account within that bank.
Most banks then verify ownership by sending two small deposits (usually between $0.01 and $0.99) to the external account over one to two business days. You log into the external account, find those deposits, and report the amounts back to the first bank. Once you confirm the amounts, the link is established and you can transfer money between the accounts.
Some banks use a faster method called instant verification, which connects to the external bank's system directly and confirms ownership in minutes without sending test deposits. This is becoming more common but is not yet standard across all institutions.
What information you need to provide
To link an external account, you will need:
- The account number of the external account
- The routing number of the bank where the external account is held
- The name on the external account (which should match the name on your account at the bank asking for the information)
- The type of account (checking or savings)
You can find the routing number on the bottom left of your checks, on your bank's website, or by calling the bank directly. The account number is usually on the bottom right of your checks or visible in your online banking portal.
If the name on the external account does not match the name on your current account—for example, if you recently married and changed your name at one bank but not the other—you may need to update the name at one of the institutions before linking is possible.
Risks and protections when linking accounts
Linking an external account does carry a small risk. If someone gains access to your online banking login, they could potentially transfer money out of the external account to an account they control. However, most banks limit the amount you can transfer in a single day and require additional verification (like a code sent to your phone) before large transfers go through.
To protect yourself, use a strong, unique password for each bank account, enable two-factor authentication if the bank offers it, and review your transaction history regularly. If you see an unauthorized transfer, report it to your bank immediately. Banks are required by federal law to investigate unauthorized transfers and typically refund your money within a set timeframe if fraud is confirmed.
You can unlink an external account at any time through your online banking portal or by calling the bank. Unlinking does not affect the external account itself—it only removes the connection between the two institutions.
When you do not need to provide external account information
You are not required to link an external account to open a basic checking or savings account. Many people open accounts without providing any external account details. However, if you want to set up automatic transfers, receive direct deposits from another institution, or apply for a loan, the bank will likely ask for this information.
Some banks offer alternatives if you do not want to link an external account. You can transfer money using wire transfers (which are slower and may have fees), ACH transfers initiated from the external bank instead of the new one, or by depositing checks or cash in person. These methods work but are less convenient than a linked account.
External accounts and different types of financial institutions
An external account can be held at a traditional bank, a credit union, an online bank, a brokerage firm, or a payment service like PayPal or Square Cash. The process for linking is similar across most institutions, though some may have slightly different verification methods or transfer limits.
If you are linking an account at a very small credit union or a newer online bank, the verification process may take longer because the system may not connect automatically. In those cases, you might need to upload documents proving you own the account, such as a recent statement or a screenshot from your online banking portal.
Frequently Asked Questions
Can someone else's bank account be my external account?
No. An external account must be in your name or a name you are authorized to use. If you try to link someone else's account without permission, you are committing fraud. If you share finances with a spouse or partner, you can add them as an authorized user on your account or open a joint account instead.
What happens if I provide the wrong account number when linking?
The test deposits will go to the wrong account, and you will not be able to confirm the amounts. The link will fail, and you can try again with the correct number. The test deposits sent to the wrong account will typically be returned to the bank within a few days.
Do I have to keep an external account linked after I set it up?
No. You can unlink it whenever you want through your online banking settings. Unlinking does not close the external account or affect it in any way—it only removes the connection between the two banks.
How long does it take to link an external account?
With test deposits, the process usually takes one to three business days. With instant verification, it can happen in minutes. The time depends on your bank's system and whether the external bank participates in instant verification networks.
Is linking an external account the same as a wire transfer?
No. Linking creates a permanent connection between accounts that you can use for multiple transfers. A wire transfer is a one-time movement of money that does not require linking. Wire transfers are faster but usually cost money, while linked accounts are free to use.