The Canada Revenue Agency (CRA) will only accept one return per tax year, so you can’t prepare another return using TurboTax. You also can’t use our software to Refile a return because you didn’t use our software to file your return.
If you need to change something on your return, you can do so using the CRA’s My Account service, or by filling out Form T1ADJ – T1 Adjustment Request.
You can log into the CRA’s My Account service on their website: My Account for Individuals
You can download the T1ADJ from this CRA webpage: T1-ADJ T1 Adjustment Request
For more information about changing your tax return, please see this TurboTax article: How to Change Your Tax Return AFTER You’ve Filed
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