How to Lock Your Bank Account and Cards: Step-by-Step Guide

When people ask how to “lock” a bank account, they usually want to stop anyone else from taking money out of it. Most banks do not offer one button that locks everything, but they do provide a set of tools that achieve the same goal. This guide explains each one and how to use them, so you can shut the door on hackers quickly.

Last updated: October 2026. Menus and features vary by bank, so follow the exact steps in your bank’s app or website. This is general information only.

This article is part of our full series on protecting your bank account from hackers.

What “locking” a bank account really means

There are four common levels of lockdown, from lightest to strongest:

Locking or freezing a card: Temporarily blocks a debit or credit card.
Setting limits and payment blocks: Restricts how much can be moved and which types of payment are allowed.
Restricting the account through your bank: You call your bank and ask them to place a hold or restriction.
Closing and replacing the account: The most drastic option, used when an account is seriously compromised.

Step 1: Lock or freeze your card

Most major banks let you freeze a card from inside their app within seconds. A frozen card cannot be used for new purchases or cash withdrawals until you unfreeze it. The exact label varies: look for options such as “Lock card,” “Freeze card,” “Card controls,” or “Manage card.”

Open your bank’s official app and log in.
Select the card you want to protect.
Choose the lock or freeze option and confirm.
Check that the card status shows as frozen or locked.

A lock is useful if you misplace a card, notice suspicious charges, or simply want extra protection when you are not using it. Note that a freeze often does not stop recurring payments you have already authorised, so ask your bank how it handles those.

Step 2: Set spending limits and block unused payment types

Many banks let you control exactly how your card and account can be used. Common settings include:

Daily transfer and card limits: Set them just above your normal spending.
Online purchases: Turn off if you never shop online with that card.
Overseas payments and ATM withdrawals: Switch off when you are not travelling, then switch on before a trip.
Contactless payments: Disable them if you do not use them.
Cash withdrawals: Block them on cards you only use for shopping.

Lower limits mean that even if a criminal gets in, they can take much less before you notice.

Step 3: Turn on real-time alerts

Alerts are your early warning system. Turn on notifications for:

Every card transaction, or transactions above a small amount
Logins from new devices
Password or contact detail changes
New payees being added
Large transfers

Step 4: Add extra friction for new payees and large payments

Some banks offer extra checks when you add a new payee or make a large transfer, such as a delay, a second confirmation, or a call-back. If your bank offers these, switch them on. Also use payee name checks where they exist. In the UK, for example, Confirmation of Payee checks that the name matches the account before you send money.

Step 5: Ask your bank to restrict or freeze the account

If you believe someone has access to your account, do not wait. Call your bank using the number on the back of your card or on its official website, and ask them to place a restriction or hold on the account. Explain what has happened, and ask what is blocked and how long it will last. Make a note of the date, time, the name of the person you spoke to, and any reference number.

If you think you have been hacked, follow our complete guide on what to do if your bank account is hacked.

Step 6: Lock down the accounts around your bank

A locked bank account is only as safe as the accounts connected to it. Make sure your email, phone account, and any payment apps are secure too:

Use unique passwords stored in a password manager
Switch on strong login protection, as explained in our guide to two-factor authentication and passkeys
Check which apps and services are linked to your accounts and remove any you do not recognise

Lock your credit file too

Freezing your card does not stop criminals from using your personal details to open new accounts. In the US, you can place a free freeze on your credit reports. See our guide on how to freeze your credit.

Debit card or credit card: which is safer to use online?

In general, credit cards offer stronger legal protection for unauthorised purchases in many countries, and a fraudulent charge does not drain your own cash balance while it is disputed. Debit cards take money directly from your account, so a thief can empty your balance before you can get it back, even if you are eventually refunded. Many people keep a credit card or a separate low-balance account for online shopping.