When filing Missouri state returns via the desktop version of TurboTax Premier (and possibly other versions, too) - make sure you check the split income section of the Missouri 1040!
Normally, TurboTax pops up a window when I get to the Missouri tax, asking me to split our total federal income between myself and my spouse, as Missouri requires. This time it didn't, and I didn't notice until I'd already e-filed: My income isn't taxable in Missouri, so TurboTax gave the whole federal amount to my spouse - and then put a NEGATIVE amount in my column!
The end resulting number is correct, so maybe the state will accept it; however, that DEFINITELY IS NOT the way it's supposed to be done!
I called Support - and they said to list the bug in the comments in my survey of the tech - hunh - not at all what I would expect. Sigh... what is TurboTax doing?