DawnC:
I am joining this thread because I am having the exact same issue with the Schedule A Line 18 checkbox.
I have created a sanitized version of my return here: 1221591
I am using the desktop version of the Premier edition.
Everything else you need to know should be in the sanitized tax return.
Thanks for looking into this! As a retired software engineer this sure looks like a bug in the software, but maybe we all made the same mistake. Hope you find it.
- Barry66
