dmertz
Level 15

Retirement tax questions

To make a solo 401(k) contribution, this income will have to be considered to be income from self-employment, income that is reported on Schedule C or Schedule F.

As far as I know, Fidelity does not offer a Designated Roth Account in their self-employed 401(k).  You can't contribute to another employer's 401(k) plan based on your income from self-employment.