An S Corporation is required to file a separate tax return, Form 1120S. S Corp returns can be prepared using TurboTax Business. And, yes, you will need to prepare and file the 1120S form first, because then a K-1 form will be generated that you will use to include the S Corp income on your personal return. Your personal income tax return will need to use an individual version of TurboTax as TurboTax Business only creates business entity returns.
Also, note that the S Corp return, Form 1120S, was due March 15, 2019 of this year.
TurboTax Business
