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Essential Business Tax Deadlines for December 2025

As we approach the end of the year, it's crucial for businesses to stay on top of important tax deadlines in December. This month includes critical due dates for corporate estimated tax payments and payroll tax deposits. Here's a detailed overview to ensure you don't miss any key obligations.

December 15 - Corporate Estimated Tax Payments

Mark your calendars for the fourth and final installment of estimated tax for corporations operating on a calendar year basis. This critical payment for 2025 ensures your corporation remains compliant with tax regulations.

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

Employers who adhere to monthly deposit rules must submit their Social Security, Medicare, and withheld income taxes for November by this date. Additionally, any nonpayroll withholding deposits for November should also be completed, following the monthly deposit rule.

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December 31 - Final Financial Moves

The last day of the year serves as a strict deadline for any year-end financial actions you wish to execute. However, given that some financial institutions may close early or fully on December 31st, it's advisable to act in advance to avoid any unnecessary delays.

Handling Weekends & Holidays

Should a deadline fall on a weekend or legal holiday, the due date will automatically shift to the next business day. This rule ensures businesses are not penalized for non-workdays.

Extensions for Disaster Areas

In situations where your area is declared a disaster zone, certain tax returns and payments may qualify for extended deadlines. For up-to-date information on designated disaster areas and their corresponding extensions, visit FEMA's disaster declarations and the IRS's tax relief resources.

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