You can request a change to your tax return by amending the amount entered on specific line(s) of your return. Do not file another return for that year, unless the return you want to amend was a 152(7) factual assessment.
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 2022 must relate to the 2012 or a later tax year to be considered.
There are two ways to adjust your tax return: ReFILE and by mail
For more information, please see the Canada Revenue Agency (CRA) link as How to change a return
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