December 2025 Business Tax Deadlines: Key Dates and Tips

As the year approaches its close, December brings pivotal tax deadlines for businesses, notably corporate estimated tax payments and monthly payroll tax deposits. Here's a brief guide to help you stay ahead of these critical dates as you finalize your financial actions for 2025.

December 15 - Corporate Estimated Tax Payment

Corporations are required to fulfill the fourth installment of their estimated tax for the 2025 calendar year. Ensure timely payments to avoid potential penalties.

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December 15 - Social Security, Medicare, and Withheld Income Tax

Employers governed by the monthly deposit rules must deposit Social Security, Medicare, and withheld income tax for November 2025 by this date. This is also applicable for nonpayroll withholding if monthly deposit rules apply.

December 31 - Year-End Deadlines

December 31 marks the final business day of the year to execute any planned financial actions. It’s critical to address these tasks before closures, as year-end demands and financial institution schedules may not accommodate eleventh-hour requests.

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Weekend and Holiday Adjustments:
If a deadline lands on a weekend or a legal holiday, it’s extended to the next business day not declared a legal holiday. Keep this in mind to ensure compliance.

Disaster Area Extensions:
For businesses operating in federally designated disaster areas, deadlines can be extended. Check FEMA’s declarations and IRS’s tax relief updates for applicable extensions.

As a trusted partner in tax and accounting services, our Houston-based team at Tangie R Cooper CPA Inc is here to help your business navigate these timelines with confidence, ensuring you're prepared and compliant. For personalized assistance, reach out to us today.

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