Hi @Cstoll Welcome to the community. Thank you for stopping by and seeing about an update.

We have checked on this and see that this was reported to development. After their review, this has been determined to be working by design. According to the instructions for Form MO-1040, page 6, "If the amount you would otherwise report as your federal adjusted gross income would be a negative number, enter $0 on Line 1. Attach a copy of Federal Form 1040 or Federal Form 1040-SR."

Hope this helps and Happy posting!