How to change your return

If you need to make a change to any return you have sent us, do not file another return for that year. You should wait until you receive your Notice of Assessment before requesting any change to a return that has not been processed. You can do so in one of the following ways.

By Internet

You can now make changes yourself to your return online. To access our electronic service, simply log on to My Account and select the Change my return option. You can then enter and submit any changes to your most recent Income Tax and Benefit Return, or to your returns of the previous two years, and they will be sent directly to our processing systems.  For example, you may want to increase a deduction you claimed or add information from a slip you received after you sent us your income tax return.

You cannot use this service to get general information or information about tax or matters related to investigations. To change your address, see How to change your address.

By mail

Send both of the following to your tax centre:

• a completed form T1-ADJ T1 Adjustment Request, or a signed letter providing the details of your request (including the years of the returns you want us to change), your social insurance number, your address, and a telephone number where we can reach you during the day; and
  
• supporting documents for the changes you want to make and, if you have not sent them to us before, supporting documents for your original claim.

Only requests relating to tax years ending in any of the 10 calendar years before the year you make the request will be considered. For example, a request made in 2007 must relate to the 1997 or a subsequent tax year to be considered.

It usually takes eight weeks before we complete the adjustment and mail you a Notice of Reassessment. If you need help to complete your online change, please call our general enquiries line at 1-800-959-8281.