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Federal Income Tax Deadlines for Businesses

Businesses - Partnerships (including LLCs), C Corps (Form 1120), and S Corps (Form 1120S)

Jan 31 March 15 Apr 15 Sep 15 Oct 15
1099 deadline 1120S deadline 1120 deadline 1120S extended deadline 1120 extended deadline
W2 deadline 1065 deadline   1065 extended deadline  

 



  • January 31 - Employers are required to send W-2 forms to their employees. This information is essential for employees to accurately file their personal income tax returns with the IRS.

  • January 31 - Employers and businesses are required to send out certain 1099 forms to independent contractors and other non-employee workers. The most common type, the 1099-MISC or NEC, is used to report payments made to independent contractors, freelancers, and other self-employed individuals.

  • March 15 - Tax returns for certain business entities, such as 1065 Partnerships and 1120S corporations, are due. Businesses classified as partnerships, including multi-member LLCs, and S corporations must submit Form 1065 or Form 1120-S, respectively, by March 15, if they operate on a calendar year basis. For businesses using a fiscal year, the tax return must be filed by the 15th day of the third month after the end of the fiscal year. For instance, if your business operates from April 1 to March 31, the tax return would be due on June 15th instead of March 15th.

  • April 15 - C corporation taxes are due. Businesses structured as C corporations must submit Form 1120 by April 15, if they follow a calendar year. For those operating on a fiscal year, the tax return is due by the 15th day of the fourth month after the fiscal year ends. For instance, if your fiscal year runs from April 1 to March 31, your business tax return would be due on July 15 instead of April.

  • September 15 - This date marks the final deadline for filing extended tax returns for 1065 Partnerships and 1120S corporations Businesses that have previously filed for an extension must ensure that all necessary documentation and forms, such as Form 1065 for partnerships and Form 1120-S for S corporations, are accurately completed and submitted to the IRS by this date. Failure to meet this deadline could result in penalties and interest charges.

  • October 15 - Final deadline for C corporations. These businesses must ensure that Form 1120, along with any other required documentation, is accurately completed and submitted to the IRS by this date. Failure to meet this deadline may result in substantial penalties and interest charges, underscoring the critical importance of timely compliance for C corporations operating under an extended timeline.

 

 

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