Deductions & credits

Thank you!  If you happen to know what part of the tax code or IRS publication supports that correction, I'd appreciate that.  (Otherwise, I'll figure it out myself!)

 

Here's a variation that I am also considering and would like feedback.  What if I modify my $30,000 Schedule C net profit by including an expense on Schedule C Line 19 "Pension and profit plans" for $5,656, representing the Employer contribution for me personally, to my traditional solo 401(k)?  Then my Schedule C net profit is reduced to $24,344.  From that value, I compute SE tax and subtract half of it to get to $22,624 net earnings.  I then designate all of that as an Employee deferral.  That increases the total for these two contribution to $28,280, which is $399 higher than the total you give.  Can I do it this way?  (I am assuming that if this is allowed, it doesn't change that I can still give another $7,000 to my Roth IRA, but if that's wrong, please explain.)

 

Thank you!