How can I revise a Canada Revenue Agency (TurboTax) return from a previous year (4 years ago to be exact)?

[TurboTax_Susan]

If you used TurboTax Do It Yourself (Online) then unfortunately, ReFILE is not available for returns from before 2023. But you can still make adjustments using the Canada Revenue Agency’s (CRA) My Account service or you can print & mail a T1-ADJ T1 Adjustment Request from their website.