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Can I open a Solo 401(k) if I am an independent contractor but also work part-time as an employee?
If you have self-employment income you can open a Solo 401k.  Your question is unclear as to what your employment status is.  If you are self-employed as an independent contractor, you can open a Solo 401k.  You can still do this even if you also earn non-self-employment income (i.e., you are an employee and receive a W-2).  However, the limits for contributions to a Solo 401k are based on your self-mployment income, not your total income, so if you have only a small amount of self-employment income, you won't be able to contribute much to the Solo 401k.  You may be able to reduce your taxes somewhat, but it's not like you can earn $1000 of self-employment income, open a Solo 401k, and dump $5000 into it; the limits don't work that way.