@MrsE79 It is the employer's responsibility to report your contributions accurately on the W-2. So that none of your contributions will be included in the gross wages box 1 of the W-2.
Are you saying that you made contributions to the 401(k) and some of those contributions are not being reflected in box 12 of the W-2 and are being included in your gross income?
If so, then you need to get a corrected W-2 from your employer so that your gross wages are being correctly reported on the W-2 and your 401(k) contributions are also correctly reported.
