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I know I need to fill out my K1 Form, when are they due?
Partnerships and S-corporations must provide their partners or shareholders with a Schedule K-1 no later than the due date (including extensions) of the business tax return.
If you are a shareholder in an S Corporation (Form 1120S), the due date is March 15.
If you are a partner/member in a partnership/LLC (Form 1065), the due date is April 15.