Tax filing reminders

  • September 15 – Third quarter installment of 2016 individual estimated income tax is due.
  • September 15 – Filing deadline for 2015 tax returns for calendar-year corporations that received an automatic extension of the March filing deadline.
  • September 15 – Filing deadline for 2015 tax returns for partnerships that received an extension of the April filing deadline.
  • October 1 – Generally, the deadline for businesses to adopt a SIMPLE retirement plan for 2016.
  • October 17 – Deadline for filing 2015 individual tax returns on extension.
  • October 17 – Deadline for reconverting a Roth IRA to a regular IRA.

Major tax deadlines for March

  • March 1 – Due date for farmers and fishermen who chose not to make 2015 estimated tax payments to file 2015 tax returns and pay taxes in full to avoid underpayment penalties.
  • March 15 – 2015 calendar-year corporation income tax returns are due.
  • March 15 – Deadline for calendar-year corporations to elect S corporation status for 2016.
  • March 31 – Payers who file electronically must submit 2015 information returns (such as 1099s) to the IRS.
  • March 31 – Employers who file electronically must submit 2015 W-2 copies to the Social Security Administration.