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Essential October 2025 Tax Deadlines for Businesses

As autumn arrives with its refreshing breezes, it's a crucial time for business owners to keep an eye on important tax deadlines. October is filled with key dates for corporate filings, payroll deposits, and retirement plan contributions. Keeping track of these deadlines will help you stay compliant and steer clear of unnecessary penalties.

October 15 - Corporate Income Tax Filing

For corporations operating on a calendar year, October 15 is the deadline to file your 2024 income tax return (Form 1120) if you had previously secured an automatic 6-month extension by April 15. Ensure timely payment of any taxes, interest, or penalties owed by this date.

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October 15 - Payroll Tax Deposits

Employers subject to the monthly deposit rule must also mark October 15 on their calendars as the due date for depositing Social Security, Medicare, and withheld income taxes for September 2025. The same deadline applies for nonpayroll withholding deposits if the monthly deposit rule is applicable.

October 15 - Establishing a Keogh Account

If you are self-employed and benefitted from an automatic 6-month filing extension for your 2023-2024 tax return, October 15, 2025, is your last chance to set up a Keogh Retirement Account to contribute for the 2024 tax year.

October 15 - Contributions to SEP IRAs and Keogh Plans

October 15 is also the final day to make contributions to a SEP or Keogh retirement plan for the 2024 tax year, provided your tax return is under extension through this date.

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October 31 - Quarterly Payroll Tax Responsibilities

By October 31, businesses must file Form 941 for the third quarter of 2025. You should deposit or pay any undeposited taxes as directed by the accuracy of deposit rules. If the total tax liability is less than $2,500, the tax can be paid in full with a timely return. If the tax has been fully deposited for the quarter, you have until November 10 to file the return.

October 31 - Federal Unemployment Tax Deposit

For companies with a Federal Unemployment Tax (FUTA) liability exceeding $500 through September, make sure to deposit these taxes by October 31.

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October 31 - Small Employer Guidelines

If your annual tax liability surpasses $2,500 but is less than $2,500 for the quarter, ensure any outstanding payments are made by the end of the month.

Weekend and Holiday Rules

Should any of these deadlines fall on a weekend or legal holiday, you’re automatically granted an extension to the next business day.

Disaster Area Extensions

If your area has been declared a disaster zone, there's potential for extended deadlines. For the latest information, check the FEMA: FEMA's disaster declarations and IRS: IRS disaster relief updates.

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