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2023 Q3 tax calendar: Key deadlines for businesses and other employers

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Here are some of the key tax-related deadlines affecting businesses and other employers during the third 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 ensure you’re meeting all applicable deadlines and to learn more about the filing requirements.

July 31 

  • Report income tax withholding and FICA taxes for second quarter 2023 (Form 941) and pay any tax due. (See the exception below, under “August 10.”)

  • File a 2022 calendar-year retirement plan report (Form 5500 or Form 5500-EZ) or request an extension.

August 10 

  • Report income tax withholding and FICA taxes for second quarter 2023 (Form 941), if you deposited on time and in full all of the associated taxes due.

September 15

  • If a calendar-year C corporation, pay the third installment of 2023 estimated income taxes.

  • If a calendar-year S corporation or partnership that filed an automatic six-month extension:

    • File a 2022 income tax return (Form 1120-S, Form 1065 or Form 1065-B) and pay any tax, interest and penalties due.

    • Make contributions for 2022 to certain employer-sponsored retirement plans.