2018 Q4 tax calendar: Key deadlines for businesses and other employers

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Published: 01 October 2018 01 October 2018

Here are a few key tax-related deadlines for businesses and other employers during Quarter 4 of 2018.  Keep in mind that this isn't all-inclusive, so there may be additional deadlines that apply to you.  Contact us for more about the filing requirements and to ensure you're meeting all applicable deadlines. 

October 15 

• If a calendar-year C corporation that filed an automatic six-month extension:
  • File a 2017 income tax return (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 FICA taxes for third quarter 2018 (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 (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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