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

11 Sep 2018 Q4 Tax Calendar: Key Deadlines for Businesses & Other Employers

Here are some of the key tax-related deadlines affecting businesses and other employers during the fourth quarter of 2018. Keep in mind this list is not all-inclusive, so there may be additional deadlines that apply to you. Contact us to make sure you are meeting all applicable deadlines and to learn more about the filing requirements.

October 15

  • If a calendar-year C corporation that filed an automatic six-month extension:
    • File a 2017 income tax return (IRS Form 1120) and pay any tax, interest, and penalties due
    • Make contributions for 2017 to certain employer-sponsored retirement plans

October 31

  • Report income tax withholding and Federal Insurance Contributions Act (FICA) taxes for third quarter 2018 (IRS Form 941) and pay any tax due. (See exception below under ‘November 13’)

November 13

  • Report income tax withholding and FICA taxes for third quarter 2018 (IRS Form 941), if you deposited on time and in full all of the associated taxes due.

December 17

  • If a calendar-year C corporation, pay the fourth installment of 2018 estimated income taxes.
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