I have a C-Corporation. How and what software can I use to file?

[BMcCalpin]

 C Corps file IRS form 1120. The TurboTax Business product can create several different types of business returns, including the 1120.

Please see https://turbotax.intuit.com/small-business-taxes/ for information on how to download the TurboTax Business product (or order the CD).

[VolvoGirl]

You need Turbo Tax Business which is a separate program than the personal versions.  Do you need 2 programs.

Turbo Tax Business  is not available to do online or on a Mac.  You can buy the Window's version here.  And you can have both TT Business and TT Home & Business (or any personal version) installed on  your computer at the same time.

https://turbotax.intuit.com/small-business-taxes