Ask a question

How do I report an unauthorized transaction?


If you need to report an unauthorized transaction on your bank account, please call us immediately at 1 877 CALL BMO (225-5266), or visit nearest BMO Bank of Montreal branch

We will reimburse you 100% for any losses to your Personal Banking accounts resulting from unauthorized transactions through Online Banking.  For more information, please visit the Electronic Banking Guarantee.

If you have an unauthorized transaction on your Credit Card, please call the MasterCard Customer Contact Centre immediately at 1 800 263 2263.

Did this information answer your question?

Top 10 Questions

  1. How do I perform a wire transfer?
  2. How do I get a void cheque for a preauthorized deposit?
  3. What are the abbreviations for the transaction types for personal accounts?
  4. How do I pay my income taxes online?
  5. How do I transfer money to another individual or small business?
  6. How do I set up Direct Deposit?
  7. How do I find the branch/transit or account number?
  8. When are the tax slips mailed?
  9. How do I get a replacement bank card or a credit card?
  10. How do I order cheques for my bank account?
questions?