401(K) contributions are done through your employer, unless you are self-employed.
If you work for others, all you need to do is to enter your W-2 forms, including box 12. This is all the 401(K) information required, as long as there are no distributions.
If you are self-employed and you contribute to an Individual 401(K) or a Roth 401(k), the information is entered under Self-employed Retirement plans.
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