Here are some of the key tax-related deadlines affecting businesses and other employers during the third quarter of 2023. 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 2023 (Form 941) and pay any tax due. (See the exception below, under “August 10.”) File a 2022 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 2023 (Form 941), if you deposited on time and in full all of the associated taxes due. September 15 If a...