Linking a bank account connects one financial account to another service so money can move between them automatically
When you link a bank account, you give a company or service permission to access that account for specific transactions. The link itself is not a new account — it is an authorization that lets money flow in or out based on what you set up. Most commonly, you link a checking or savings account to a payment app, bill pay service, investment platform, or peer-to-peer transfer service so you can move money without entering your account number each time.
The link works by connecting your routing number and account number to the external service. That service can then initiate transfers, deposits, or withdrawals on your behalf. You control what the service can do — you might allow transfers out but not deposits in, or set a maximum amount per transaction. The bank does not need to approve each individual transfer; the authorization you gave covers all transactions within the rules you set.
Key Takeaways
- Linking a bank account means giving a service permission to move money in or out, using your routing and account numbers.
- You can link the same account to multiple services, and each link can have different permissions and limits.
- Most links use ACH (Automated Clearing House), which takes one to three business days for money to actually move.
- If a linked service commits fraud or makes an unauthorized transfer, you can dispute it with your bank and recover the money within a set timeframe.
- Removing a link stops future transfers but does not undo transactions that already went through.
Why you link accounts instead of entering details each time
Linking saves you from typing your account number into a form every time you want to send money or set up a recurring payment. Once linked, the service has the authorization to pull or push money without asking again. This is especially useful for bills you pay monthly, apps you use regularly, or services where you move money back and forth.
The link also lets you set up automatic transfers — for example, moving money from checking to savings every payday, or having a bill pay service withdraw your electric bill on the due date. Without the link, you would have to log in and manually transfer each time. The trade-off is that you are giving the service ongoing access, so you need to trust it and monitor your account for unauthorized activity.
How the link actually moves money
Most bank account links use ACH (Automated Clearing House), a network that processes electronic transfers between U.S. bank accounts. When you link your account and authorize a transfer, the service sends an ACH instruction to your bank. Your bank then sends it through the ACH network to the receiving bank, which deposits or withdraws the money from the account on the other end.
ACH transfers take one to three business days to complete. The money does not move instantly. If you link your account on a Friday evening and authorize a transfer, it may not leave your account until Monday, and the receiving account may not see it until Tuesday or Wednesday. Some services show the transfer as "pending" during this window. Weekends and bank holidays add extra days.
A few services use faster methods like real-time payments or wire transfers, but these are less common for routine account linking. Your bank and the service you are linking to determine which method they use. If speed matters — for example, you need to move money before a bill is due — ask the service how long transfers take before you link.
What permissions you can set when linking
When you link an account, the service asks what it is allowed to do. Common permissions include:
- Withdrawals only: The service can pull money out but cannot deposit. This is typical for bill pay or peer-to-peer transfer apps.
- Deposits only: The service can put money in but cannot take it out. This is common for direct deposit or paycheck apps.
- Both: The service can move money in either direction. Investment apps and some payment platforms use this.
- Amount limits: You can cap how much the service can move per transaction or per day. Some services set this automatically based on your account history.
- Frequency limits: You can restrict how often the service can initiate transfers, though this is less common.
You do not have to accept all permissions the service requests. If a bill pay app asks for deposit permission but you only want it to withdraw your bills, you can refuse the deposit permission. Your bank will honor the link with only the permissions you grant. If the service later needs a different permission, you can update the link in your account settings.
Linking the same account to multiple services
You can link one bank account to many different services at the same time. For example, you might link your checking account to your employer's payroll system (for direct deposit), a bill pay service (to pay utilities), a peer-to-peer app (to send money to friends), and an investment app (to fund a brokerage account). Each link is separate, and each service only sees its own authorization.
Your bank tracks all the links and all the transfers flowing through them. If multiple services try to withdraw money on the same day and your account does not have enough funds, your bank will process them in the order they arrive and may decline the later ones. This is why it is important to monitor your account and know which services are scheduled to pull money and when.
You can remove any link without affecting the others. If you stop using a bill pay service, you can unlink it while keeping your payroll direct deposit and peer-to-peer app linked. Removing a link stops future transfers but does not reverse transactions that already went through.
Security and fraud protection when you link
Linking your account is generally safe if you link to a legitimate, established service. Your bank does not share your full account number with the service — instead, it uses a secure token or reference number. The service never stores your password or login credentials; it only stores the authorization to move money.
If a linked service is hacked or commits fraud, your bank's fraud protection covers you. Under the Electronic Funds Transfer Act, if you report an unauthorized transfer within 60 days, your bank must investigate and return the money if the transfer was not your fault. If you wait longer than 60 days, your protection is weaker or may not apply, so check your account regularly and report problems quickly.
To reduce risk, link only to services you recognize and trust. Before linking, check that the service uses encryption (look for "https://" in the web address) and has a privacy policy explaining how it handles your data. If a service asks for your full account number or password, do not link through it — legitimate services do not need those details.
What happens if you need to unlink or change a link
Unlinking is simple: go to your account settings in the service or your bank, find the linked account, and select "remove" or "unlink." The link is deleted immediately, and no new transfers can be initiated. However, transfers that were already scheduled or pending will still go through if they have already been sent to the ACH network.
If you unlink and then realize a transfer is still coming, contact the service or your bank right away. If the transfer has not yet left your account, they may be able to cancel it. If it has already been sent through ACH, you will need to wait for it to arrive and then dispute it with your bank if it was unauthorized.
To change permissions on an existing link — for example, to lower the transaction limit or remove deposit permission — go to the link settings and update them. You do not need to unlink and relink; most services let you modify permissions without breaking the connection.
Frequently Asked Questions
Can I link a savings account instead of checking?
Yes. Most services accept both checking and savings accounts. Savings accounts may have withdrawal limits under federal rules, so some services will not let you link a savings account for frequent transfers. Check the service's requirements before linking. If you link a savings account and hit the withdrawal limit, the transfer may be declined.
What if the service I linked to goes out of business?
The link becomes inactive and no new transfers can happen. Any transfers already in progress will still complete. Your bank will not automatically remove the link, so you should remove it yourself from your bank's settings to prevent any future attempts. Your money in your bank account is not affected — the link only controls whether the service can move it.
Do I need to link my account, or can I just enter my details each time?
You can enter your details manually each time if you prefer, though most services make linking easier and faster. Some services require linking for recurring payments or direct deposit. If you are uncomfortable linking, ask the service whether manual entry is an option for one-time transfers.
Can someone else link my account without permission?
No. Linking requires your login credentials or explicit authorization through your bank. If you see a link you did not create, contact your bank immediately and remove it. This is a sign of account compromise and you should change your password and review your recent activity.
How long does it take to link an account?
Linking usually takes a few minutes. You enter your account number and routing number, review permissions, and confirm. Some banks add a verification step where they send small deposits to your account and ask you to confirm the amounts — this can take one to two business days. After verification, the link is active and ready to use.