Thank you for your question.
You can make changes to a filed tax return by filing an adjustment to each of the respective tax years as needed. The Canada Revenue Agency (CRA) requires that you wait until you’ve received your Notice of Assessment (NOA) before filing an adjustment. In many cases, the CRA will catch the mismatch and automatically adjust your return for you.
For detailed instructions on filing adjustments, please follow the link - I've filed my tax return. Can I still make changes?
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