Self Directed 401k

[Kenneth Shultz]

I need some help with thinking through the self directed 401k. I have two side business: (1) professional service firm, and (1) real estate investment company. Both are new companies, and in their infancy. I do not take much out as compensation, because I want the companies to thrive.

I am also a licensed professional engineer, and work for a company and receive a W2 from that company. I use my income to fund and start my other businesses. My question is: am I able to use my income from my employer to make contributions to a self directed 401k plan that is set up by my side business?

Thank you!

Kenny