@xmlesage Stop stressing about it. That answer does not go on your tax return. It only goes into the software, which is working toward letting you e-file. If you did not know your 2018 AGI it is okay to use "zero" in the software in an attempt to e-file. But if zero does not work--and sometimes it does not---then you have to print, sign and mail the return.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
