2018 Q3 Tax Calendar: Key Deadlines for Businesses & Other Employers

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19 Jun 2018 Q3 Tax Calendar: Key Deadlines for Businesses & Other Employers

Below are a few of the key tax-related deadlines affecting businesses and other employers during the third 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.

July 31

  • Report income tax withholding and Federal Insurance Contributions Act (FICA) taxes for second quarter 2018 (IRS Form 941), and pay any tax due. (See the exception below, under ‘August 10.’)
  • File a 2017 calendar-year retirement plan report (IRS Form 5500 or IRS Form 5500-EZ) or request an extension.

August 10

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

September 17

  • If a calendar-year C corporation, pay the third installment of 2018 estimated income taxes.
  • If a calendar-year S corporation or partnership that filed an automatic six-month extension:
    • File a 2017 income tax return (IRS Form 1120S, IRS Form 1065, or IRS Form 1065-B) and pay any tax, interest, and penalties due.
    • Make contributions for 2017 to certain employer-sponsored retirement plans.
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