If you need to make a change to any return you have sent to the CCRA, 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 make changes yourself to your return online. To access the CCRA's 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 their processing systems.  For example, you may want to increase a deduction you claimed or add information from a slip you received after you sent them 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 they can reach you during the day; and
• supporting documents for the changes you want to make and, if you have not sent them to the CCRA before, supporting documents for your original claim.

Note
Send your Form T1 ADJ or letter separately from your return.

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 2020 must relate to the 2010 or a subsequent tax year to be considered.

It usually takes eight weeks before they will complete the adjustment and mail you a Notice of Reassessment.

Notice of Assessment or Reassessment

By using My Account, you can view and print detailed information on a particular assessment or reassessment to your income tax and benefit return for the current year or the four prior years.

You may be able to obtain a duplicate of your Notice of Assessment or Notice of Reassessment. See Payment forms and remittance vouchers for more information.

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