Essential October 2025 Tax Deadlines for Businesses

As the crisp autumn air rolls in, October marks a pivotal month for crucial tax deadlines that businesses must adhere to. From corporate tax returns to payroll commitments and retirement fund contributions, observing these deadlines is vital to maintain compliance and avoid unnecessary penalties.

October 15 - Corporation Tax Responsibilities

Submit your 2024 calendar year corporation income tax return (Form 1120), ensuring all taxes, interest, and penalties, if any, are settled. This deadline is applicable if a 6-month extension was filed by April 15.

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October 15 - Payroll Tax Deposits

If you're an employer, and the monthly deposit rule applies to you, ensure your deposit of Social Security, Medicare, and withheld income taxes for September is completed by October 15. Additionally, nonpayroll withholdings for September are due by this date, provided the monthly rule applies.

October 15 - Initiating Keogh Retirement Plans

For self-employed individuals with a tax filing extension for 2023-2024, October 15, 2025, is the final day to establish a Keogh Retirement Account for 2024 contributions.

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October 31 - Quarterly Payroll Filings

File Form 941 for the third quarter of 2025 by October 31. Adhere to the accuracy-of-deposit rules for any undeposited taxes. Should your tax liability be under $2,500, it's permissible to remit payment with a promptly filed return. If the quarter's tax was fully deposited on time, submission of the return can be extended to November 10.

October 31 - Federal Unemployment Tax Commitments

Ensure any owed Federal Unemployment Tax through September that exceeds $500 is deposited by October 31.

Weekends & Holidays Adjustment

Deadlines falling on a weekend or legal holiday automatically extend to the next business day that is not a holiday.

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Disaster Area Considerations

Recognize that tax deadlines can be modified for areas deemed disaster zones. More details on disaster area extensions can be found through the following resources:
FEMA: https://www.fema.gov/disaster/declarations
IRS: https://www.irs.gov/newsroom/tax-relief-in-disaster-situations

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