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Critical Tax Deadlines: Navigating October 2025 for Businesses

As the leaves begin to fall, October brings important tax obligations for businesses. Stay ahead of the curve by marking these critical deadlines on your calendar to ensure compliance and avoid potential penalties.

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October 15 - Corporate Income Tax Filing
Corporations operating on a calendar year must file their 2024 income tax return (Form 1120) by October 15, provided an automatic 6-month extension was requested by April 15. Ensure any owed taxes, interest, and penalties are paid by this date.

October 15 - Payroll Tax Obligations
Employers must deposit Social Security, Medicare, and withheld income taxes for September 2025 if the monthly deposit rule applies, alongside nonpayroll withholding deposits.

October 15 - Establishing Keogh Plans
Self-employed individuals who obtained a filing extension have until October 15, 2025, to establish a Keogh Retirement Account for contributions intended for the 2024 fiscal year.

October 15 - Final Contributions to Retirement Accounts
This marks the deadline to contribute to SEP or Keogh retirement plans for the 2024 calendar year if your tax return is extended to October 15.

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October 31 - Quarterly Payroll Tax Filings
The deadline for filing Form 941 for Q3 2025 is October 31. Employers should deposit any undeposited taxes according to accuracy of deposit rules. However, those who have timely deposited the full tax amount for the quarter can file until November 10.

October 31 - Small Employer Obligations
Certain small employers need to deposit any undeposited tax if the total liability for 2025 exceeds $2,500, yet remains under $2,500 for the quarter.

October 31 - Federal Unemployment Taxes
Employers should deposit any federal unemployment taxes due through September if they total more than $500.

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Additional Considerations

Weekends & Holidays
Should any deadline fall on a Saturday, Sunday, or legal holiday, it automatically extends to the next business day.

Disaster Area Relief
Areas designated as disaster zones may see extensions on due dates. For detailed updates on such areas, visit the FEMA and IRS websites for the latest information.

Efficiently managing these deadlines is essential to maintaining your business’s financial health and compliance. As a business owner, keeping informed and prepared can ensure seamless operations throughout the year.

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