Qualifying Self-Employment Income for Solo 401k

[Shawn Root]

So, what income qualifies you to be able to form a solo 401k? They sound so much better than a self directed IRA, that I'd like to go this route if possible. If I had a rental property outside of the retirement account could I, for example, form a property management company to manage it? Would that qualify as active income? Or do I have to have something non-real estate related?