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Critical October 2025 Tax Deadlines for Businesses

As the cool breeze of October sets in, it’s crucial for business owners to navigate significant tax deadlines. From corporate filings and payroll deposits to finalizing retirement contributions, staying ahead is vital to maintaining compliance and avoiding fines.

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October 15 - Corporate Tax Filings

Ensure that your 2024 calendar year income tax return (Form 1120) is filed with any due tax, interest, and penalties paid. This deadline is only applicable if you filed an automatic 6-month extension by April 15.

October 15 - Payroll Tax Deposits

If you’re an employer adhering to monthly deposit rules, ensure your Social Security, Medicare, and withheld income taxes for September 2025 are deposited by this date. Nonpayroll withholdings for September are also due for those on the monthly deposit schedule.

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October 15 - Retirement Account Actions

For self-employed individuals granted a filing extension, October 15 is the last opportunity to open a Keogh Retirement Account for 2024 contributions. It’s also the deadline for SEP or Keogh plan contributions if your tax return is extended.

October 31 - Third-Quarter Filings

File Form 941 for Q3 2025, ensuring any undeposited taxes are settled in line with the accuracy of deposit rules. With a tax liability under $2,500, payment can accompany your return, provided it's filed punctually. If full deposits were timely and complete, extend your filing to November 10.

October 31 - Federal Unemployment Tax

Ensure the Federal Unemployment Tax for amounts over $500 to cover through September is deposited by this month’s end.

Weekends and Holidays Impact:

If any deadline lands on a weekend or legal holiday, the following business day becomes your new deadline, provided it’s not a holiday itself.

Consider Disaster Extensions:

For regions marked as disaster areas, deadline extensions might apply. Check disaster designations and adjusted due dates via FEMA and IRS resources.

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