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When you're completing the Form 1120, within the program, certain information is asked about the officers percentage of ownership, capital contribution, etc. Once you include the information about the officers, that information automatically transfers over to the Schedule K-1. The Schedule K-1 is not a form that you will separately complete within the return.
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I reread your question. If you're asking where on the 1120 does information from the Schedule K-1 go, the answer is nowhere. Information from the Schedule K-1 is reported on the individual tax return (1040), not the corporate return. A Schedule K-1 is generated within a corporate return.