That's a roth 401k vs a roth IRA as far as the funding limits. They are different (with the roth IRA being restricted to 193k/yr)So as long as I show less than $193k on my taxes, I can contribute up to $56,000 a year to a Solo 401k?
And then I can choose to put that in a low fee Vanguard Indexed fund or whatever? And a certain % Roth?
What happens if my income shows over the $193k or whatever it increases to year to year?
You can have a low fee Vangaurd indexed fund in a Roth IRA. A roth is not an investment, it is a tax code. You can have all kinds of stuff in there. You want to short $BYND with puts because you think they're garbage, you can do that too.
Your CPA should be helping you with this stuff.
Just don't ask them for investment advice. They'll gladly give it but unless they're on the financial services side of the business as well, their advice in our universe normally sucks.