If your National Bank Mastercard^® credit card has been lost or stolen, you can temporarily lock or cancel it yourself to prevent any fraudulent transactions.

From the National Bank app:

1. Sign in to the National Bank app.
2. Click Menu at the bottom of your screen.
3. Then, click My cards.
4. Under your credit card, click Lock to temporarily lock your card.
5. Or click Manage, then on Lost or stolen card to receive a new one in the mail.
6. Follow the instructions.

Watch our demo on how to lock, unlock or replace your credit card from the National Bank app.

From your web browser:

1. Sign in to your online bank.
2. Click Overview in the menu, then select your credit card.
3. Click Lock or cancel my card and then follow the steps.

Watch our demo on how to lock, unlock or replace your credit card from your online bank.

If you lock your credit card, you’ll no longer be able to complete any transactions with it. You also won’t be able to use it if you request a replacement card.

Travelling outside the country?

Call us to check if we can replace your card while you’re outside the country:

• From the United States: 1-800-361-0070
• Anywhere else in the world: 514-844-8026. From a landline. We accept collect calls.
  

You can also contact Mastercard Global Service ^® at the local number of the country you’re visiting. Your call will be redirected to our customer service department.