Here are some of the key tax-related deadlines affecting businesses and other employers during the fourth quarter of 2023. Keep in mind that this list isn’t all-inclusive, so there may be additional deadlines that apply to you. Contact us to make sure 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 businesses in federally declared disaster areas.
Tax-Filing & Tax-Payment Deadlines
Monday, October 2
The last day you can initially set up a SIMPLE IRA plan, provided you (or any predecessor employer) didn’t previously maintain a SIMPLE IRA plan. If you’re a new employer that comes into existence after October 1 of the year, you can establish a SIMPLE IRA plan as soon as administratively feasible after your business comes into existence.
Monday, October 16
If a calendar-year C corporation that filed an automatic six-month extension:
- File a 2022 income tax return (Form 1120) and pay any tax, interest, and penalties due.
- Make contributions for 2022 to certain employer-sponsored retirement plans.
- Establish and contribute to a SEP for 2022, if an automatic six-month extension was filed.
Tuesday, October 31
Report income tax withholding and FICA taxes for third quarter 2023 (Form 941) and pay any tax due. (See exception below under ‘November 13.’)
Monday, November 13
Report income tax withholding and FICA taxes for third quarter 2023 (Form 941), if you deposited on time (and in full) all of the associated taxes due.
Friday, December 15
If a calendar-year C corporation, pay the fourth installment of 2023 estimated income taxes.
Contact us if you’d like more information about the filing requirements and to verify you’re meeting all applicable deadlines.