2018 Q4 Tax Calendar: Key Deadlines for Businesses and Other Employers

With the year coming to an end, don’t forget the important business deadlines. Here are some of the key tax-related deadlines affecting businesses and other employers during the fourth quarter of 2018. Keep in mind that this list isn’t all-inclusive, so be sure to contact our tax advisors to ensure you’re meeting all applicable deadlines and to learn more about the filing requirements.

Oct. 15
  • If your business is a calendar-year C corporation that filed an automatic six-month extension:
    • File a 2017 income tax return (Form 1120) and pay any tax, interest and penalties due.
    • Make contributions for 2017 to certain employer-sponsored retirement plans.
Oct. 31
  • Report income tax withholding and FICA taxes for third quarter 2018 (Form 941) and pay any tax due. (See exception below under “November 13.”)
Nov. 13
  • Report income tax withholding and FICA taxes for third quarter 2018 (Form 941), if you deposited all of the associated taxes due in full and on time.
Dec. 17
  • If your business is a calendar-year C corporation, pay the fourth installment of 2018 estimated income taxes.

 

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