2018 Q3 Tax Calendar

Key deadlines for businesses and other employers

Here are some of the key tax-related deadlines affecting businesses and other employers during the second quarter of 2018. 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 2018 (Form 941), and pay any tax due. (See the exception below,     under “August 10.”)
  • File a 2017 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 2018 (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 (Form 1120S, Form 1065      or 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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