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December 2025 Essential Tax Deadlines for Businesses

With December upon us, it's crucial for businesses to stay ahead of pivotal tax deadlines, including corporate estimated tax installments and monthly payroll tax submissions. This month also serves as the final call for executing year-end financial strategies before the curtain falls on December 31st.

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December 15 - Corporations

Corporations operating on a calendar year are required to submit the fourth quarter installment of their estimated taxes for 2025 by this date.

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

If your business is subject to the monthly deposit rules, it’s time to remit your November 2025 deposits for Social Security, Medicare, and withheld income tax. This is also applicable for non-payroll withholdings.

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December 31 - Critical Year-End Notice

Ensure that any necessary financial actions that cannot feasibly be completed on the 31st are prioritized earlier. Many financial institutions may not be operational on the final day.

Weekends and Legal Holidays:

Deadlines landing on a weekend or legal holiday will be automatically extended to the next working day that's not a legal holiday.

Disaster Area Extensions:

In scenarios where an area is declared a disaster zone, deadline extensions will apply. For specifics, check if a region falls under this criteria through these updates: FEMA and IRS.

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