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Key Deadlines for Businesses in October 2025

As we transition into the refreshing autumn months, October becomes a pivotal time for businesses to meet significant tax obligations. From corporate tax submissions to payroll duties and retirement contributions, staying informed of these crucial dates ensures compliance and helps avert penalties.

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October 15 - Corporate Tax Filings

Corporations need to file their 2024 calendar year income tax return using Form 1120 and settle any outstanding tax, interest, or penalties. This deadline applies provided you secured an automatic 6-month extension back in April.

October 15 - Employer Payroll Taxes

If your business operates under monthly deposit rules, by October 15, you must deposit Social Security, Medicare, and withheld income taxes for September 2025. This also holds for nonpayroll withholding deposits if the monthly rule applies.

October 15 - Establishing Keogh Retirement Accounts

For the self-employed, October 15, 2025, marks the last opportunity to establish a Keogh Retirement Account if you plan to make contributions for 2024 and have submitted an extended tax return.

October 15 - SEP IRA & Keogh Contributions

This is also the cut-off date for contributions to SEP or Keogh retirement plans for the 2024 calendar year, in cases where the tax return extension is valid until October 15.

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October 31 - Quarterly Payroll Tax Filings

By the end of the month, businesses should file Form 941 for the third quarter of 2025 and ensure all tax deposits are accurate. If your liability is under $2,500, you may pay this with your timely submitted return. Those who completed full and timely deposits have until November 10 to file.

October 31 - Small Employer Deposits

Small employers should deposit any undeposited amounts if the liability totals $2,500 or more for the year but is below $2,500 for the quarter ending.

October 31 - Federal Unemployment Tax

Ensure you deposit payroll taxes due as of September if the amount exceeds $500.

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Weekend and Holiday Adjustments:

If any deadline coincides with a weekend or public holiday, it automatically extends to the subsequent business day that isn’t a holiday.

Extensions for Disaster Areas:

In cases where geographic regions are declared disaster zones, filing and deposit deadlines are extended. To determine if such an extension applies, check the following resources:

FEMA: FEMA Disasters
IRS: IRS Tax Relief for Disasters

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