In a past year I used 1099-NEC income to open a Solo 401k (yay!). Now I get issued a 1099-MISC each year for a separate reason. QUESTION: Can I contribute 1099-MISC income to my Solo 401k?
UPDATE: Just to clarify @AliciaP1's answer below: She is assuming that all "self-employed income" is being reported on 1099-NEC's, and that income reported on 1099-MISC's is not. This is generally true, I just wanted to spell it out here.
In my case I have rental property managed by a property manager, and they issue me a 1099-MISC at the end of the year. This is income but not self-employment income.