Essential October 2025 Tax Deadlines for Businesses

As October arrives, it's not just the cool breeze of autumn that businesses need to anticipate but also crucial tax deadlines. This month brings important compliance dates ranging from corporate tax filings and payroll deposits to retirement contributions. Stay ahead of these requirements to maintain compliance and avoid costly penalties.

October 15 - Corporate Tax Filings

If you've secured a six-month extension back in April, October 15 is your final deadline to file the 2024 calendar year income tax return using Form 1120. It's imperative to settle any taxes, accrued interest, and potential penalties by this date.

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October 15 - Employer Tax Obligations

Businesses adhering to monthly deposit regulations must deposit Social Security, Medicare, and withheld income taxes for September 2025 by the 15th. This also applies to any nonpayroll withholding deposits.

October 15 - Retirement Account Deadlines

For self-employed individuals granted an extension to file their 2024 tax returns, October 15, 2025, marks the deadline to establish a Keogh Retirement Account for 2024 contributions. Additionally, it's the last day to make contributions to a SEP or Keogh retirement plan, assuming you filed for an extension until mid-October.

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October 31 - Quarterly Payroll and FUTA Taxes

By October 31, employers must file Form 941 to report third-quarter taxes if their tax liability is under $2,500. For those who have deposited the taxes on time, there's an extended deadline—November 10—for the filing. Additionally, for federal unemployment taxes, deposits for amounts exceeding $500 that incur up to September must also be completed.

Handling Weekends and Holidays

Should any tax deadline fall on a weekend or a recognized holiday, the deadline extends automatically to the next business day. Disaster Relief Extensions

Disaster Relief Extensions

If a disaster declaration affects your area, tax deadlines may be adjusted. Refer to FEMA and the IRS for updates on these extensions.

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