Here are some of the key tax-related deadlines affecting businesses and other employers during the fourth quarter of 2017.

October 16 
If a calendar-year C corporation that filed an automatic six-month extension:

  • File a 2016 income tax return (Form 1120) and pay any tax, interest, and penalties due
  • Make contributions for 2016 to certain employer-sponsored retirement plans

October 31

  • Report income tax withholding and FICA taxes for third quarter 2017 (Form 941) and pay any tax due  (See exception below)

November 13

  • Report income tax withholding and FICA taxes for third quarter 2017 (Form 941), if you deposited on time and in full all of the associated taxes due

December 15

  • If a calendar-year C corporation, pay the fourth installment of 2017 estimated income taxes.

Keep in mind that this list isn’t all-inclusive, and there may be additional deadlines that apply to your business or organization. Contact your advisor to ensure you’re meeting all applicable deadlines and to learn more about the filing requirements.