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Essential December 2025 Business Tax Deadlines

The holiday season might bring festive cheer, but for businesses, December is also a time filled with crucial tax obligations. Ensure you're prepared for key business tax deadlines this month, including corporate estimated tax payments and monthly payroll tax deposits. Moreover, it's imperative to finalize year-end financial actions before businesses close for the year on December 31.

December 15 - Corporations

Corporations operating on a calendar year schedule must pay their fourth installment of estimated taxes for 2025 by this date. Timely payment is essential to avoid penalties.

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December 15 - Employer Payroll Taxes

If you are an employer subject to monthly deposit rules, ensure you deposit the Social Security, Medicare, and withheld income tax for November 2025 by this crucial deadline. It's also the due date for nonpayroll withholding deposits if the monthly deposit rule applies.

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December 31 - Year-End Actions

December 31 marks the final day for many financial transactions. Banks and financial institutions may be closed, so plan any critical activities well in advance.

Note: Weekend & Holiday Considerations: If a due date falls on a weekend or legal holiday, it extends to the next business day that isn't a holiday. Additionally, Disaster Area Extensions: If your business is within a federally designated disaster area, you may qualify for extended deadlines. To verify, check updates from FEMA and the IRS.

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