How to change your return
T1 adjustment online
Submitting a T1 adjustment online is easy, efficient, and environmentally friendly. An EFILE service provider can adjust your T1 return online with the ReFILE service. Individuals can make an online T1 adjustment with the Change my Return service in My Account. Please read below for more details.
You can request a change to your tax return by amending specific line(s) of your return. Do not file another return for that year.
Wait until you receive your notice of assessment before asking for changes to your return.
Generally you can only request a change to a return for a tax year ending in any of the 10 previous calendar years. For example, a request made in 2018 must relate to the 2008 or a later tax year to be considered.
Change my return
Change my return (CMR) is a secure My Account service that allows you to make an online T1 adjustment for the 10 previous calendar years.
An EFILE service provider can change your T1 return online for the 2017, 2016, and 2015 tax years by using the ReFILE service with EFILE certified software. ReFILE will be available for NETFILE users in 2018.
Use My Account to make changes to page 1 of your T1 Income Tax and Benefit Return, such as:
- marital status
- direct deposit
- email address
- a tax return that has not been assessed
- a tax return where nine reassessments exist for a particular tax year
- a bankruptcy return
- a return prior to the year of bankruptcy
- carryback amounts such as capital or non-capital losses
- a return of an international or non-resident client (including deemed residents of Canada, newcomers to Canada, and individuals who left Canada during the year)
- the elected split-pension amount
- a return where you have income from a business with a permanent establishment outside your province or territory of residence (you have to complete Form T2203, Provincial and Territorial Taxes for 2017 - Multiple Jurisdictions)
In any of these cases, go to By mail below.
After you have made online changes to your tax return, keep all your receipts and supporting documents in case we ask to see them. Provide supporting documents only if asked to do so and using the method of submission as indicated in our contact letter.
Send both of the following to your tax centre:
- a completed Form T1-ADJ, T1 Adjustment Request, or a signed letter giving details of your request (including the years of the returns to be changed), your social insurance number, your address, and a telephone number where we can call you during the day
- all supporting documents for the change, including those for the original assessment, unless you have already sent them to us
Send your current year return separately from any request to change a return for another year.
- online, usually within 2 weeks
- by mail, usually within 8 weeks
It may take longer if:
- Your request is sent in spring or early summer
- Your request needs more review
- We have to contact you or your authorized representative for more information or documentation
When our review is done we will send you:
- a notice of reassessment showing any changes to your return and
- a letter explaining why we did not make the changes you asked for or if no changes were needed
To change your address, go to How to change your address.
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