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Key Business Tax Deadlines in October 2025

October brings more than just cooler weather to Florida; it's a crucial month for meeting significant business tax deadlines. Properly managing these due dates ensures compliance and avoids costly penalties. Here’s a comprehensive guide to help you stay on track this October, brought to you by your trusted accounting experts serving the greater Orlando area.

October 15 - Corporate Income Tax Filing

For businesses operating on a calendar year, October 15 is the deadline to file your 2024 corporate income tax return using Form 1120. This deadline applies if you requested a 6-month extension earlier this year. Don’t forget to pay any outstanding tax, interest, or penalties due.

October 15 - Payroll Tax Deposits

If you're an employer following the monthly deposit rule, ensure that all Social Security, Medicare, and withheld income tax deposits for September 2025 are made by this date. This also applies to nonpayroll withholding deposits, essential for maintaining compliance.
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October 15 - Retirement Plans Setup and Contributions

Thinking of securing your future? If you're self-employed, October 15 is your last chance to establish a Keogh Plan for 2024, assuming your 2023-2024 tax return extension was utilized. Additionally, finalize contributions to any SEP IRA or Keogh plans by this date if filing with an extension.

October 31 - Quarterly Payroll and FUTA Reporting

Get ready to file Form 941 for Q3 2025 by October 31. Pay all unpaid taxes under the deposit rule unless your total liability is under $2,500, which allows full payment with the return. Likewise, small employers must settle undeposited taxes if between $2,500 and $500 for the quarter. Lastly, handle any pending Federal Unemployment Tax (FUTA) deposits for amounts exceeding $500.
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Additional Timing Considerations

Remember, when deadlines fall on weekends or legal holidays, extensions to the next business day are automatic. Should your business operate within a designated disaster area, you may be eligible for extended deadlines, so stay informed using resources like FEMA and IRS advisories.

As your professional accounting partner in Maitland, Florida, we pride ourselves on safeguarding small businesses with our expert financial and regulatory services. Whether you're in Winter Park, Lake Nona, or the surrounding area, we’re here to help navigate these pivotal deadlines with confidence.

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