2017 is a unique year in which April 15th falls on a Saturday, and the following Monday is a federal holiday. Therefore, the main tax return deadline is April 18.

Whether you are a fiscal year taxpayer or filing quarterly, here are other important dates to keep in mind for individuals and business owners this tax season:

Fiscal Year Taxpayers


  • March 15: Form 1120S
    • S corporations must provide each shareholder with a copy of their Schedule K-1 (Form 1120S) or substitute Schedule K-1
  • A corporation with a short tax year ending in June must file by the 15th day of the 3rd month after the end of its tax year
  • April 18: Form 1120
  • If you need an extension, go here


  • March 15: Partnership¬†Form 1065 Due
  • This allows time for partners to receive Schedule K-1’s before the personal tax return due date
  • If you need to file for an extension, go here

Individuals & Sole Proprietors

  • April 18: Form 1040 needs to be filed
  • If you need to file for an extension, go here

Quarterly Tax Payers


  • Form 1120-W Due at the close of every quarter

Individuals & Sole Proprietors

  • Quarterly payments are due in equal installments on the 15th day of the 4th, 6th, and 9th months of your tax year, as well as on the 15th day of the 1st month after your tax year ends.

This is just an overview of the important dates and forms. If you need more information on deadlines and forms? Visit the IRS website.