The fastest way to block someone from seeing your bank account is to change your online banking password, turn on multi-factor authentication, and sign out every other device. That handles the common case of a shared login. If the other person is an authorized signer, holds a power of attorney, is a joint owner, or connected a budgeting app to your account, each situation needs its own fix, and sometimes the only clean answer is closing the account and starting over at a different bank.
Lock Down Your Online and Mobile Access
Anyone with your username and password can watch every transaction, download statements, and see your balance in real time. Open your bank’s website or mobile app and change the password to something the other person could never guess. Turn on multi-factor authentication so every new login requires a one-time code from your phone or an authenticator app. Most banks include a “sign out of all devices” button that kills every active session on other phones, tablets, and browsers. Use it right after you change the password.
Then check the contact information on file. If the other person’s email or phone number is listed anywhere on the account, they can still receive alerts, password-reset links, and verification codes. Replace them with an email address and phone number only you control. Update your security questions too, especially if the other person knows your mother’s maiden name, your childhood street, or similar answers.
Switch to paperless statements while you’re in there. A paper statement mailed to a shared address gives anyone in the household your balance and transactions. Electronic-only delivery keeps that information behind the login you just secured.
Disconnect Third-Party Apps
This is where a lockdown often fails. You can change every password on your bank’s site and still leave a door open through a budgeting app, payment service, or financial tracker that someone else linked to your account. Services like Plaid act as a bridge between your bank and hundreds of apps. Once the connection exists, the app can pull transaction data without your bank password, so changing that password does not cut the app off.
Plaid runs a free consumer dashboard at my.plaid.com that lists every app connected to your accounts and lets you disconnect any of them.1Plaid. How Do I Disconnect My Financial Accounts From an App Disconnecting stops future data pulls but does not delete what the app has already stored. Contact the app’s support team separately to request deletion of your historical data. Then look inside your bank’s own settings for linked external accounts and third-party permissions, and revoke anything you don’t recognize.
Remove an Authorized Signer or Power of Attorney
An authorized signer can walk into a branch, ask for your balance, and transact as if the account were theirs. Removing one usually means filling out a bank form in person and presenting a government-issued photo ID. Policies vary, but most institutions won’t process a signer removal over the phone. Once the change goes through, the former signer loses all access.
Revoking a power of attorney is more formal. You sign a written revocation, and most banks require it to be notarized before they’ll act on it.2BMO Alto. BMO Alto Power of Attorney Revocation Form Bring the revocation to the branch with your ID and account number, and ask for written confirmation that the person’s access has been terminated. Keep that letter. Until the bank processes the revocation, the agent named in the power of attorney can still act, so don’t wait on this one.
Joint Accounts Are Different
A joint account is the hardest case because both owners have equal legal rights. You cannot remove the other person or hide transactions from them the way you can with an authorized signer. In most states, the account agreement requires both owners to consent before one is removed.3Consumer Financial Protection Bureau. Can I Remove My Spouse From Our Joint Checking Account A few banks allow unilateral removal, but that is the exception.
When the other owner won’t cooperate, closing the account is usually the only clean solution. Either owner can typically request a freeze to stop new withdrawals while the closure processes. The bank issues the remaining balance, often as a cashier’s check, and sends a final statement to both owners. After closure, there is no future activity to see.
Don’t Drain the Account First
Emptying the account before the other person does is tempting and legally risky. Joint owners are generally presumed to hold equal shares of the balance. If you withdraw more than your proportional share, the other owner can sue you for the difference. Courts treat this as a contract dispute under the account agreement, and the losing side can be ordered to return the excess plus the other party’s legal costs. The bank letting you take the money does not transfer ownership of it to you.
Open a Fresh Account at a Different Bank
Sometimes the cleanest move is a sole-owner account at a completely different institution. You get a new account number with no ties to anyone who had access before. Federal rules require the new bank to collect your name, date of birth, address, and taxpayer identification number, and to verify your identity with an unexpired government-issued photo ID such as a driver’s license or passport.4eCFR. 31 CFR 1020.220 – Customer Identification Program
Move your funds electronically through a wire or ACH transfer rather than in cash. If you do move cash, any transaction over $10,000 triggers a mandatory Currency Transaction Report to the federal government.5FinCEN. Notice to Customers: A CTR Reference Guide The report itself is routine and legal. Splitting a large amount into smaller deposits to avoid the report is called structuring, and it is a federal crime that carries up to five years in prison.6Office of the Law Revision Counsel. 31 US Code 5324 – Structuring Transactions to Evade Reporting Requirement Transfer the money normally and let the bank file whatever paperwork it needs to.
Once the transfer clears, confirm the old account shows a zero balance and request formal closure in writing. An account left open at zero can be reopened by a straggling autopay or recurring charge, which would restore visibility to anyone who still has access.
Divorce and Litigation Change the Rules
If you are going through a divorce or any lawsuit involving finances, there are limits on how much you can shield your accounts from the other side. Courts require both parties to disclose financial assets during discovery, and that includes every bank account. Hiding an account, transferring money to make it disappear, or failing to disclose a new account can bring serious consequences: courts have awarded the entire hidden asset to the other spouse, ordered the hiding party to pay the other side’s attorney fees, and held people in contempt.
The steps above address unauthorized, informal access. They do not override a court order or a discovery obligation. If a judge orders you to produce statements, you must produce them no matter where the account sits now. Talk to a family law attorney before making financial moves during active litigation.
If You Are Leaving an Abusive Situation
The standard steps still apply, but safety and speed change the calculus. Call your bank and explain what’s happening. Many institutions have dedicated teams or escalation procedures for customers experiencing abuse, and they can sometimes expedite account changes, waive new-account fees, or flag the account for heightened security. Ask specifically about suppressing your new address in their system if you have relocated for safety.
The CFPB has begun rulemaking to address financial harms like coerced debt, where an abuser opens accounts or runs up balances in a victim’s name.7Consumer Financial Protection Bureau. CFPB Kicks Off Rulemaking to Help Mitigate the Financial Consequences of Domestic Violence and Elder Abuse If you suspect accounts have been opened fraudulently in your name, pull your credit reports from all three bureaus and dispute anything you didn’t authorize. The National Domestic Violence Hotline (1-800-799-7233) can connect you with advocates who specialize in financial safety planning.