2018 Q3 tax calendar: Key deadlines for businesses and other employers
- Details
- Published: Monday, 25 June 2018 10:01
- Written by Phillip Strickler, CPA.CITP

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.