2020 Q4 tax calendar: Key deadlines for businesses and other employers




Here are some of the key tax-related deadlines affecting businesses and other employers during the fourth quarter of 2020. Keep in mind that this list isn’t all-inclusive, so there may be additional deadlines that apply to you. Contact us to ensure you’re meeting all applicable deadlines and to learn more about the filing requirements.


Thursday, October 15



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

    • File a 2019 income tax return (Form 1120) and pay any tax, interest and penalties due.

    • Make contributions for 2019 to certain employer-sponsored retirement plans.




Monday, November 2



  • Report income tax withholding and FICA taxes for third quarter 2020 (Form 941) and pay any tax due. (See exception below under “November 10.”)


Tuesday, November 10



  • Report income tax withholding and FICA taxes for third quarter 2020 (Form 941), if you deposited on time (and in full) all of the associated taxes due.


Tuesday, December 15



  • If a calendar-year C corporation, pay the fourth installment of 2020 estimated income taxes.


Thursday, December 31



  • Establish a retirement plan for 2020 (generally other than a SIMPLE, a Safe-Harbor 401(k) or a SEP).


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