No, there's no way to reverse this because 401(k) contributions would have to have been made, through your employer, in 2019.
- The contributions would have shown up on your 2019 W-2.
- Your employer can't go back and re-do all the payroll transactions to include your 401(k) contributions.
- That would also mean your employer would have to refile all the payroll tax forms and give you a corrected W-2.
- There also isn't a way to make the change in TurboTax, using the income tax forms.
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