The TurboTax online or desktop personal editions do not support IRS Form 1120, U.S. Corporation Income Tax Return.
To complete and file a Form 1120 you will 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.
Go to this TurboTax website for the Business Edition - https://turbotax.intuit.com/small-business-taxes/
