Hard to know.
The IRS apparently made some late change (in the last couple weeks) as to how the Box 12 ,Code S is to be treated in certain situations.
TTX is working on the appropriate changes...try again each Thurs or Friday (Software updates usually come out on Wed or Thursday nights.)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
