If you are going to file a corporate return, you must file Form 1120S.
Form 1120S (U.S. Income Tax Return for an S Corporation) is available in TurboTax Business.
When you first start a return in TurboTax Business, you'll be asked to select the type of return you want to prepare. Select Business return and then select S Corporation to add Form 1120S to the return.
You will select 1st year filing.
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