The TurboTax personal editions doe not support a C Corp tax return Form 1120 or an S Corp Form 1120S.
You would need to purchase the TurboTax Business Edition. The Business Edition can only be installed on a Windows based personal computer, not on a Mac or online. The Business Edition cannot complete a personal tax return, Form 1040.
TurboTax Business Edition - https://turbotax.intuit.com/small-business-taxes/
