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03-18-2018 11:12 PM
No, just enter them where you enter your W-2 income.
The amount you contributed to your 401k will already be subtracted from your compensation by your employer before it's entered in Box 1 of your W-2. If you don't have any other pre-tax deductions from your wages you'll likely notice that the difference between Box 1 and Boxes 3 and 5 is the amount of your 401k contributions. This is because you have to pay medicare and social security taxes on the full amount of your compensation, including the amount you contribute to your 401k, but because you're deferring the income that you contribute to a 401k, it's not considered in your wages for income tax purposes (Box 1).