Do you need to prepare the S corp return or enter a K-1 from the S-corp? You can enter your W2 and K-1 into Online Premium or any of the personal Desktop programs.
For the S corp you will need to use Turbo Tax Business.
TT Business is not available to do online or on a Mac. You can buy the Windows Desktop Business program here,
https://turbotax.intuit.com/small-business-taxes/cd-download
You can have both Turbo Tax Business and a personal Desktop program installed on the same Windows computer at the same time. You can buy the personal Desktop CD/Download program now here,
https://turbotax.intuit.com/personal-taxes/cd-download
