For calendar year tax returns reporting 2017 information that are due in 2018, the following due dates will apply.

Form  2018 Filing Due Date (Tax Year 2017)
Form W-2 (electronic or mail)

Form 1065 – Partnerships

Form 1120S – S Corporations

Form 1040 – Individuals

FinCEN 114 – FBAR (will be allowed to extend)

January 31st

March 15th

March 15th

April 17th 

April 17th

Form 1041 – Trusts and Estates

Form 1120 – C Corporations

Form 990 Series – Tax Exempt Org

Form 5500 Series – Employee Benefit Plan


April 17th

April 17th

May 15th

July 31st



Form 1065 Extended Return

Form 1120S Extended Return

Extended Due Dates

September 17th 

September 17th

Form 1041 Extended Return

Form 1120 Extended Return

Form 1040 Extended Return

FinCEN 114 (Extended with Form 1040)

Form 990 Series Extended Return

October 1st

October 15th

October 15th

October 15th

November 15th

Form 5500 Series Extended Return November 15th


For fiscal year filers:

  • Partnership and S Corporation tax returns will be due the 15th day of the third month after the end of their tax year. The filing date for S Corporations is unchanged.
  • C Corporation tax returns will be due the 15th day of the fourth month after the end of the tax year. A special rule to defer the due date change for C Corporations with fiscal years that end on June 30 defers the change until December 31, 2025 – a full ten years.
  • Employee Benefit Plan tax returns are due the last day of the seventh month after the plan year ends.

It is important to check when tax returns are due for all states in which taxpayers operate, because individual states may not conform to the Federal filing dates.

Changes include:

  • Filers of U.S. Return of Partnership Income (Form 1065) will have a longer extension period, a maximum of 6 months, rather than the current 5 month extension, leaving the former (2015 and prior years) extended due date in place (September 15th for calendar year taxpayers.)
  • U.S. Income Tax Return for Estates and Trusts (Form 1041) will have a maximum extension of five and a half months, two weeks longer than the former (2015 and prior years) five month extension.
  • Annual Return/Report of Employee Benefit Plans will have a maximum automatic extension of three and a half months.
  • Report of Foreign Bank and Financial Accounts (FinCEN 114, FBAR) will be due on the same due date as the individual Form 1040 and permitted to extend for six months, thus aligning the FBAR reporting with the individual tax return reporting. Additionally, the IRS may waive the penalty for failure to file a timely extension request for any taxpayer required to file for the first time.
  • Filers of Form 990 (series) will now have an automatic 6 month extension period, ending on November 15th for calendar year filers, rather than a 3 month period.