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October 2025 Business Tax Deadlines: Stay Ahead

As autumn blankets the landscape with cool breezes, October brings with it critical tax deadlines for businesses. Meeting these deadlines is essential for compliance and avoiding costly penalties. Here’s a breakdown of key dates you should mark on your calendar.

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October 15 - Corporate Tax Filings

Filing your corporate tax return is crucial this October. If your business operates on a calendar year, Form 1120 along with any related payments, interests, and penalties, are due by this date, provided you have obtained an automatic six-month extension back in April 2025.

October 15 - Payroll Tax Deposits

Employers adhering to monthly deposit rules need to complete their Social Security, Medicare, and withheld income tax deposits by October 15. The same deadline holds for any nonpayroll withholding deposits from September 2025.

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October 15 - Retirement Account Setup

For self-employed professionals, establishing a Keogh plan is on the agenda if you’re planning contributions for 2024. October 15 is the final day to open this retirement account, assuming a tax filing extension was granted.

October 31 - Form 941 Submission

By the end of the month, employers need to file Form 941, covering the third quarter of 2025. If you’ve met your deposit obligations under the accuracy of deposit rules, consolidating any outstanding amounts is key, remembering the $2,500 threshold. For those who submitted full quarterly deposits on time, there’s an extension to file by November 10.

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October 31 - Federal Unemployment Tax

Finally, make sure any federal unemployment tax exceeding $500 through September is deposited by October 31.

Handling Exceptions

Keep in mind, if the due date lands on a weekend or legal holiday, extensions to the next working day are automatic. Additionally, disaster designations in geographical areas may lead to further extensions. Staying informed through FEMA or IRS resources will help clarify timelines in affected areas.

Ensure these crucial deadlines don’t slip by unnoticed, allowing your firm to remain compliant and financially efficient throughout this autumn season.

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