Thanks so much for the explanation @dmertz . Just want to make sure I understand you correctly, for a net profit on Schedule C of $15,000, I subtract the deductible portion of self-employment taxes, $1,060, then it leaves $13,940 as the maximum permissible total contribution for solo 401k and Roth solo 401k. Within this $13,940, if I contribute $6000 to Roth solo 401k and $7,940 to regular solo 401k, then I am allowed to contribute $6000 to either Roth IRA or Traditional IRA or split between the two?
