<human>: Give me the gist of the text in a nutshell

I am a 26 year old grad student in the United States who is married (my wife makes $55k a year).  We are maxing out both of our Roth IRAs and her 403b.  We came into a good bit of money that is currently sitting in taxable accounts.  We don't plan on spending it until our retirement.  In effect, we are looking to slowly convert this taxable money into tax-advantaged money by maxing out all of our tax-advantaged opportunities.  In that regard, I am considering starting a solo-401k. After conducting some research, I am still unclear on which segments of my income are eligible to be contributed to the solo-401k.  I've listed my yearly income below.  Any information on what I can contribute would be greatly appreciated.

**My income:**

Student Stipend: ~$43,000

Conference Speaking Fee (from Brazil): ~$3,000

Adjunct teaching: ~$7,500

Consulting: ? (none yet, but there is a potential of some on the horizon)

I would be glad to answer any questions.  Thank you for your help!
<bot>: I want to start a solo-401k, but I don't know what exactly is considered "eligible income" for this purpose.