What to Do If You Lose Your BMO Credit Card in Canada

Secure your account and replace your lost BMO credit card instantly.

Olesya Krasavtseva
Fact-checked by Olesya Krasavtseva
Content Editor at Prostobank Consulting Prostobank Consulting Logo
Updated: 01.10.2026
Table of Contents

Realizing you have lost your Bank of Montreal (BMO) credit card can trigger immediate panic, but acting swiftly is the key to protecting your finances. Whether your card was misplaced at a local coffee shop or stolen while travelling, BMO provides robust digital tools and 24/7 customer support to secure your account and prevent unauthorized transactions.

As a Canadian cardholder, you are protected by Mastercard's Zero Liability policy, meaning you will not be held responsible for fraudulent charges as long as you report the loss promptly. Knowing the exact steps to lock your account digitally or cancel the card permanently ensures your funds remain secure while a replacement is mailed to you.

Category Details
Emergency Phone Number 1-800-263-2263 (Available 24/7 toll-free)
Temporary Protection Use the Lock Card feature in the BMO app.
Replacement Fee Usually $0 for standard delivery (rush fees may apply).
Liability Protection Mastercard Zero Liability applies to prompt reports.

Step-by-Step Guide to Reporting a Lost BMO Card

  • Log In Securely: Open the BMO Mobile Banking app or log in to BMO Online Banking via desktop.
  • Select Your Credit Card: Tap or click on the specific Mastercard account for the card you have lost.
  • Navigate to Card Management: Select the Manage Card icon (often represented by a gear symbol).
  • Temporarily Lock (Optional): If you think you might find the card, select Lock Card to freeze all new transactions temporarily.
  • Report Lost or Stolen: If the card is permanently gone, select Report Lost or Stolen. Follow the on-screen prompts to permanently deactivate the 16-digit number and automatically issue a replacement card.

Pro-Tip: Because your replacement BMO credit card will have a brand new 16-digit number, expiration date, and CVV, any pre-authorized payments (like Netflix, gym memberships, or utility bills) will bounce. Keep a list of your recurring bills so you can update your payment details the moment your new card arrives.

Troubleshooting Common Reporting Pain Points

  • MFA Verification Issues: If you lost your phone along with your credit card, you will not be able to receive the SMS text for Multi-Factor Authentication (MFA) to log in. In this scenario, immediately call the emergency number (1-800-263-2263) and verify your identity verbally with an agent.
  • Browser or App Errors: If the Manage Card portal fails to load during an emergency, switch from Wi-Fi to cellular data, or clear your browser cache. Severe app glitches should be bypassed by calling BMO directly.
  • Locked Digital ID: In a panic, you might mistype your password multiple times, locking your BMO digital profile. If your ID is locked, you cannot report the card via the app. You must call customer service to both unlock your profile and report the card missing.

Efficiency Hack for Faster Security

Do not wait on hold with customer service if you simply misplaced your card at home. Use the Lock Card toggle in the BMO app. It takes three seconds and instantly halts all in-store and online purchases. If you find the card under the couch an hour later, simply toggle it back to "Unlocked" and resume using it without the hassle of waiting a week for a replacement in the mail.

Frequently Asked Questions

Will I lose my BMO Rewards points if my card is lost or stolen?

No. Your BMO Rewards or CashBack balances are tied to your primary BMO account profile, not the physical plastic card. When your new replacement card is issued, all your earned points and rewards will seamlessly transfer over.

How long does it take to get a replacement BMO credit card?

Standard delivery for a replacement BMO Mastercard is typically 5 to 7 business days within Canada. If you are travelling or have an emergency, you can call BMO to request expedited courier delivery, though a fee may apply.

What if there are already fraudulent charges on my lost card?

If you spot unauthorized transactions, you must inform the BMO representative immediately when reporting the card lost. They will initiate a fraud investigation, and under the Zero Liability policy, you will be refunded for charges you did not authorize.

Official Bank Information

Bank Of Montreal

Support: 877-225-5266

SWIFT Code: BOFMCAM2

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