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Key October 2025 Business Tax Deadlines

October marks the arrival of cooler days and pivotal tax deadlines for businesses. It’s crucial to navigate this period efficiently, ensuring all obligations are met to maintain compliance and avoid penalties. Here's what you must keep an eye on this month.

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October 15 - Corporate Tax Filings

Corporations that operate on a calendar year must file their income tax return (Form 1120) and settle any tax, interest, and penalties due by this date. This deadline is applicable if you previously secured an automatic six-month extension by April 15.

October 15 - Employer Tax Deposits

For employers adhering to the monthly deposit rules, October 15 is the deadline to deposit Social Security, Medicare, and withheld income taxes for September 2025. This is equally important for nonpayroll withholding deposits for the same period if the monthly deposit rule applies.

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October 15 - Last Chance for Retirement Accounts

Self-employed individuals with a tax return extension have until October 15, 2025, to establish a Keogh Retirement Account for 2024 contributions. Furthermore, this is the final day to make contributions to a SEP or Keogh plan for the 2024 calendar year if your return is extended.

October 31 - Quarterly Tax Filings

You must submit Form 941 for the third quarter of 2025 by this date. Ensure all taxes are deposited under the accuracy of deposit rules. If your total tax liability is under $2,500, you still have the option to pay in full with a timely filed return. However, if tax deposits are complete and timely, the deadline extends to November 10.

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October 31 - Small Employer Deposits

Small businesses with a tax liability reaching $2,500 or more for 2025 but below this amount for Q3 should deposit any undeposited tax by this date.

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October 31 - Federal Unemployment Tax

For amounts exceeding $500, deposit the unemployment tax owed through September.

Weekend and Holiday Extensions

If a deadline falls on a weekend or legal holiday, it extends to the next business day. Always verify your specific dates according to your situation.

Extensions in Disaster Areas

In case a region is designated as a disaster area, due dates may be extended. For comprehensive details on area designations and extensions, visit these resources:

Engaging with these crucial updates ensures your business remains compliant and financially healthy, allowing you to focus on strategic growth and optimization.

Schedule a Complimentary Consultation
Choose from our locations and meet with one of our qualified staff members. If you prefer to secure a Virtual Meeting via Zoom or Phone, please contact our offices at 877.908.1040
Schedule Here
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