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2018 Q4 tax calendar: Key deadlines for businesses and other employers

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Here are some of the key tax-related deadlines affecting businesses and other employers during the fourth 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.
  • October 15 If a calendar-year C corporation that filed an automatic six-month extension: File a 2017 income tax return (Form 1120) and pay any tax, interest and penalties due. Make contributions for 2017 to certain employer-sponsored retirement plans.
  • October 31 Report income tax withholding and FICA taxes for third quarter 2018 (Form 941) and pay any tax due. (See exception below under “November 13.”)
  • November 13 Report income tax withholding and FICA taxes for third quarter 2018 (Form 941), if you deposited on time and in full all of the associated taxes due.
  • December 17 If a calendar-year C corporation, pay the fourth installment of 2018 estimated income taxes. © 2018

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  • Home
  • Services
    • Tax Planning
    • Business Consultation
    • Accounting
    • Payroll
    • Tax Preparation
    • IRS Representation
  • The Eldridge Group
    • Staff
  • Contact Us
    • Feedback
  • Client Testimonials
    • Client Testimonial
    • Client Testimonial
  • News Highlights
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