I forgot to add a T4 to my return and already filed. Can I amend my return on Turbotax and refile?

[TurboTax_Susan]

Yes. You can use ReFILE to add the T4 to your return after you've received your NOA. This TurboTax Canada FAQ tells you how you can adjust your return using ReFile: I've filed my tax return. Can I still make changes?