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Essential Business Tax Deadlines for October 2025

As October brings cooler days to Gilbert, AZ, it's also a crucial period for staying on top of critical business tax deadlines. Whether running a small business or managing payroll for a corporation, keeping track of these dates is essential to ensure compliance and avoid penalties. Here's a detailed list of the key deadlines this month.

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October 15 - Corporate Tax Filing

Businesses operating on a calendar year should file their 2024 income tax return using Form 1120 and settle any dues, including taxes, interest, or penalties. Note: This deadline is valid only if an automatic 6-month extension was requested earlier in April. Ensure everything is in order to avoid disruptions to your business operations.

October 15 - Employment and Nonpayroll Tax Deposits

For employers adhering to monthly deposit rules, October 15 is the deadline to deposit Social Security, Medicare, and withheld income taxes for September 2025. It's equally important for nonpayroll obligations if the same rules apply.

October 15 - Establish Keogh Account

Self-employed individuals with extended tax filings can establish a Keogh Retirement Account for 2024 by this date. Don't miss your opportunity to optimize retirement savings.

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October 15 - SEP IRA & Keogh Contributions

This is the final day to make contributions to SEP or Keogh plans if your tax return extension is through October 15, providing a great avenue for maximizing retirement benefits.

October 31 - Quarterly Payroll Responsibilities

File Form 941 to report your quarterly tax obligations, ensuring any undeclared taxes are settled in compliance with accuracy rules. If your liabilities are less than $2,500, you have the option to settle fully with your return. Deposits made timely can extend your filing deadline to November 10.

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October 31 - Federal Unemployment Tax (FUTA)

Ensure you deposit outstanding FUTA taxes for the year through September if exceeding $500, maintaining compliance and protecting your business's financial health.

Weekend and Holiday Extensions:

Deadlines falling on weekends or federal holidays automatically extend to the next working day.

Disaster Area Extensions:

Tax relief and extended due dates apply for regions designated as disaster zones. For updates, consult FEMA and IRS resources.

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Gilbert, Arizona 85233
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