IRS Changes Tax Return Deadlines for some Business Returns

June 29, 2017

The IRS has changed, quite dramatically, the due dates for Tax returns and other forms required to be filed by individuals and businesses. We have posted a full list of updated dates due on our Forms page as a pdf for download.

Some of you may have noticed that the dates had changed this past year, but it’s part of larger overall changes being implemented by the IRS, so it’s a moving target for business owners.

Summary of major changes as follows:

Partnership returns (IRS Form 1065)

  • March 15, 2017
  • Extended deadline is September 15, 2017

C-Corporation income tax returns (IRS Forms 1120) 

  • April 17, 2017 for C-corporations on a calendar year
  • Extended deadline is October 16, 2017
  • The deadline for C-corp returns is the 15th day of the fourth month following the end of the corporation’s fiscal year if the corporation is on a fiscal rather than a calendar year. The exception is corporations with a fiscal year from July 1 to June 30. In this case, the first deadline remains Sept. 15, the 15th day of the third month following the end of the fiscal year. The extended deadline remains Feb. 15, or five months after the first deadline, through fiscal years ending June 30, 2026.​

Trust and estate income tax returns (IRS Form 1041)

  • April 17, 2017
  • Extended deadline is October 2, 2017.

For Businesses who are required to file 1099 forms:

February 1, 2017

  • Deadline for employers to mail out Forms W-2 to their employees and for businesses to furnish Forms 1099 statements reporting, among other things, non-employee compensation, bank interest, dividends and distributions from a retirement plan.

For these business returns, the due date remains the same:

S-Corporation returns (IRS Form 1120-S)

  • March 15, 2017 for corporations on a calendar year
  • Extended deadline is September 15, 2017


Please call the office if you have any questions about due dates.  207-879-7000.




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Attorney at Law
Tax & Estate Planning

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