Where do i add T3's from last year that arrived late in the mail?

[TurboTaxGinette]

You will need to adjust your 2021 return but first verify your 2021 Notice of Assessment as the Canada Revenue Agency often makes those changes from your file. The T3s may have already been added last year. Please see our TurboTax FAQ for direction: How to Change Your Tax Return After You’ve Filed

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