Here are some of the key Q4 tax calendar related deadlines affecting businesses and other employers during the fourth quarter of 2021. 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.
Note: Certain tax-filing and tax-payment deadlines may be postponed for taxpayers who reside in or have a business in federally declared disaster areas.
Friday, October 15
- If a calendar-year C corporation that filed an automatic six-month extension:
- File a 2020 income tax return (Form 1120) and pay any tax, interest and penalties due.
- Make contributions for 2020 to certain employer-sponsored retirement plans.
Monday, November 1
- Report income tax withholding and FICA taxes for third quarter 2021 (Form 941) and pay any tax due. (See exception below under “November 10.”)
Wednesday, November 10
- Report income tax withholding and FICA taxes for third quarter 2021 (Form 941), if you deposited on time (and in full) all of the associated taxes due.
Wednesday, December 15
- If a calendar-year C corporation, pay the fourth installment of 2021 estimated income taxes.
Friday, December 31
- Establish a retirement plan for 2021 (generally other than a SIMPLE, a Safe-Harbor 401(k) or a SEP).
Contact us if you’d like more information about the filing requirements and to ensure you’re meeting all applicable Q4 tax calendar deadlines.
