If your credit card has been lost, stolen or used without your authorization it is important to tell your credit card company right away.
Informing your credit card company that you no longer have the card or do not have control over its use immediately ends your liability if it is improperly used in the future, so you need to do this quickly! See the relevant section of the Business Practices and Consumer Protection Act that applies.
You can inform the credit card company by telephone, but it is also a good idea to follow up with a written statement. Keep a copy of all communications and the way that they were delivered so that you can prove that you informed them of the loss.
Once they have been informed, the credit card company becomes responsible to ensure that it no longer approves any charges on your account.
If your card was used before you informed your credit card company, you may not be responsible for any charges, if your card was used:
So, to protect yourself from someone else fraudulently using your credit card,
If you would like more information here are some links:
Self Employed? Do You Know What Your Tax Obligations Are?
What is Identity Theft and How Would it Affect Me?
The Personal Tax Filing Deadline is April 30th – Some Last Minute Reminders
Need Help With Your Return? Where to Get Answers to Your Income Tax Questions
How Far Back can a CRA Reassessment go?
Who are the Canadians Most Likely to be Audited by the CRA?
Can you Amend Your Tax Return After Filing?
Why you Should Always File Your Income tax Return on Time