Hello,
***Edited and removing my issue since the following thread answered it.***
Basically, entering nothing on Line 18 worked for me. I was reporting a business loss and it wouldn't let me enter 0 (zero) as it said this was too large and it wouldn't let me enter a negative number.
https://ttlc.intuit.com/community/retirement/discussion/in-my-sch-se-t-i-have-line-18-set-to-0-and-i...
I was using TurboTax Online Self-Employed.
Thank you
