This is from the earlier discussion:

"Putting 0 on Line 18 of that form isnt correct.

Go to the 1040/1040SR worksheet and scroll down to the Deferral for Certain Sch H and SE Filers smart worksheet looking box, Line 11 put a zero and nothing will flow to Sch 3 Line 12e."

https://proconnect.intuit.com/community/proseries-tax-discussions/discussion/deferral-of-se-tax/01/1...