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Essential December 2025 Tax Deadlines for Businesses

December is a crucial month for businesses, bringing important tax deadlines such as corporate estimated tax payments and monthly payroll tax deposits. It's the final reminder to complete all year-end financial tasks before closures on December 31.

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December 15 - Corporate Estimated Taxes

Businesses structured as corporations need to submit the fourth installment of their estimated tax for the 2025 calendar year by this date.

December 15 - Employment Taxes

For employers under the monthly deposit rule, December 15 marks the deadline for your deposit of Social Security, Medicare, and withheld income taxes covering November 2025. Additionally, if applicable, the nonpayroll withholding deposit for November is due.

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December 31 - Year-End Advisory

Plan ahead for any financial actions that need to be completed by December 31. Many institutions may not operate on this day, so advance arrangements are advisable.

Handling Weekends & Holidays:

Whenever a due date coincides with a weekend or legal holiday, it automatically shifts to the next business day that isn't a holiday.

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Extensions for Disaster Areas:

If your business is within a designated disaster area, extensions on filing deadlines might be available. For updates and more information, check these resources:

FEMA: FEMA Disaster Declarations
IRS: IRS Disaster Tax Relief

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