Partnership tax returns (Form 1065) and S Corporation tax returns (Form 1120S) are due March 15, 2021. By BCo Author|March 1st, 2021|Categories: Business Tax|Comments Off on Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInTumblrPinterestVkEmail About the Author: BCo Author Related Posts Planning to Deduct for Losses this Tax Season? Be Sure to Read the Fine Print. Gallery Planning to Deduct for Losses this Tax Season? Be Sure to Read the Fine Print. Biden Administration’s Proposed 2023 Budget Plan Calls for Corporate & High-Net-Worth Individual Tax Hikes Gallery Biden Administration’s Proposed 2023 Budget Plan Calls for Corporate & High-Net-Worth Individual Tax Hikes Three Ways to Deduct the Cost of Business Property Gallery Three Ways to Deduct the Cost of Business Property Owning Investment Real Estate through Single Member LLCs Gallery Owning Investment Real Estate through Single Member LLCs Gallery