Thank you for choosing TurboTax. Before making any changes to your tax return, you have to wait to receive your Notice of Assessment. Amendments can be made for 10 previous years, so if you are filing this year’s (2020), you can only amend back to 2010.
There are three ways to make amendments to your tax return:
- through CRA My Account,
- ReFile using your tax solution,
- or by mail.