Here are some of the key tax-related deadlines affecting businesses and other employers during the third 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. © 2018
