I don't see how it can be other then zero when the 2018 1040 line 10 instructions say "subtract line 8 and 9 from line 7. If zero or less, enter 0".
There was a bug that was adding the 2018 line 9 UBT (if any) to line 10 when it transferred that made the carryover income incorrect. That was fixed in the update.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
