Did you find where to enter the solo 401K ? Where to enter Self Employed solo 401K plans
https://ttlc.intuit.com/questions/1901283-where-do-i-enter-my-401-k-or-thrift-savings-plan-tsp-contr...
You can contribute to a 401K up to the amount of your Net Profit reduced by 1/2 of the SE tax OR to the max contribution allowed for a 401k whichever is Less.
You might qualify for the Savers Credit
https://turbotax.intuit.com/tax-tips/tax-deductions-and-credits/what-is-the-savers-credit/L3LyopRkK
I don’t know where it is. It might be under
Federal Taxes Tab
Deductions & Credits
-Scroll down to:
--Other deductions & Credits
