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LEARNING CENTER

Essential December 2025 Tax Deadlines for Businesses

December is a pivotal month for businesses, marking significant tax due dates that require timely action. From corporate estimated tax obligations to monthly payroll deposits, it's vital to stay ahead of these deadlines and finalize year-end decisions before the December 31 cut-off.

December 15 - Corporate Tax Obligations

The fourth quarterly installment of estimated taxes for corporations operating on a calendar year basis is due by this date. Ensure your calculations are accurate to avoid penalties.

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December 15 - Employer Tax Deposits

Employers subject to the monthly deposit rule must complete their deposits for Social Security, Medicare, and withheld income tax from November 2025 by this date. Additionally, nonpayroll withholding must be addressed if the monthly rule applies.

December 31 - Final Day of Fiscal Year

For any financial actions demanding completion by year’s end, budget extra time in anticipation of potential bank and institution closures on December 31. Prioritize early action if delays could hinder your plans.

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Weekend and Holiday Adjustments

Tax deadlines that coincide with weekends or legal holidays roll over to the next business day automatically, giving businesses some flexibility in filing.

Extensions for Disaster Areas

Businesses situated in federally recognized disaster areas may qualify for deadline extensions. Stay informed about your area's status via FEMA’s disaster declarations page and the IRS's tax relief site.

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