Here's the simple solution I got from reading Chico's response, followed by others.
If you're getting the Federal Review error that wants you to enter something in Line 18 of the Sch SE-S form, AND you don't want to defer SE tax payments to some later time -- you just want to pay all SE taxes now and get by this unnecessary error that TT is reporting .....
Just type 0 in Line18 (don't leave it blank) and run the Federal Review again -- error is gone and you pay all your SE taxes now.
You don't have to go back and redo any sections again or try to trick the TT system. This is a software bug that TT should fix. It seems that if this is blank, TT thinks you want to defer some portion of your SE taxes. When originally asked by TT in the Sched C section, I said I did NOT want to defer, but later after I was out of Sched C section, I did go back and change some of my 1099-NEC income values which may have triggered the problem for me since I got out of the linear order of filling out my return (but TT should be able to handle this).
If you DO want to defer SE taxes, I have no idea what to do.
