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Essential December 2025 Tax Deadlines for Business Owners

For business owners, December is a critical month demanding attention to several significant tax deadlines. It’s a time not just to reflect on the year past, but to ensure that your financial actions are in line to prevent any unexpected tax surprises. From estimated taxes to payroll deposits, we’ve got you covered with the essential deadlines you need to mark on your calendar.

December 15 - Corporate Estimated Tax Payments

If your business operates as a corporation, keep in mind that the fourth and final installment of your estimated tax for the 2025 calendar year is due on December 15. Timely payments can help you avoid penalties and manage cash flows effectively.

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December 15 - Payroll Tax Deposits

For employers who adhere to the monthly deposit rules, this is also the deadline to submit deposits for Social Security, Medicare, and withheld income taxes for November 2025. Nonpayroll withholding deposits fall under this deadline if the same rules apply.

December 31 - End of Year Financial Actions

The last day of the year is not just symbolic; it’s the final opportunity to complete many financial actions. Some financial institutions may not be open on December 31, so plan accordingly if you have pending transactions or require documentation.

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Note on Weekends & Holidays
If any deadline falls on a weekend or legal holiday, it automatically extends to the next business day, ensuring you have one less thing to worry about during the festive season.

Considerations for Disaster Area Extensions

Should your area face a natural disaster, know that tax deadlines will be extended. Stay informed by consulting FEMA’s disaster declarations or the IRS’s Tax Relief in Disaster Situations resources.

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