I have a S-CORP business.

[JulieCo]

An S Corp is required to file Form 1120S for a tax return. TurboTax Business is the software to use to create and file the 1120S form, plus to generate K-1 forms for each shareholder to report on their personal income tax returns.

  TurboTax Business

[SweetieJean]

Most 2018 S Corp returns were due March (not April) 15.