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Essential December 2025 Tax Deadlines for Businesses

As the year comes to a close, it's crucial for businesses to stay on top of critical tax deadlines to ensure compliance and financial health. December brings pivotal tax obligations, such as corporate estimated payments and payroll deposits. It's also an important time to finalize any year-end tasks before the December 31 closures.

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December 15 - Corporate Estimated Taxes

For corporations operating on a calendar year, the fourth quarterly estimated tax payment for 2025 is due on December 15. This installment is pivotal to avoid penalties and interest.

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December 15 - Payroll Tax Obligations

Employers need to adhere to the monthly deposit rules by December 15 to deposit Social Security, Medicare, and withheld income taxes for November 2025. Nonpayroll withholding deposits for the same period are also due if the monthly rule applies.

December 31 - Final Business Day

Year-end tasks require timely action, as financial institutions may have limited hours or closures on December 31. Plan accordingly to ensure all necessary actions are completed ahead of deadlines.

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Weekend and Holiday Adjustments

If any deadline falls on a weekend or legal holiday, it automatically extends to the next business day.

Disaster Area Extensions

Businesses in designated disaster areas receive extended deadlines. For updates on such declarations, visit FEMA's disaster declarations page and the IRS's disaster tax relief resources.

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