Key December 2025 Tax Deadlines for Businesses

As December unfolds, it's crucial for businesses to stay on top of essential tax deadlines, ensuring smooth operations into the new year. This month includes significant dates like corporate estimated tax payments and payroll tax deposits, alongside reminders for year-end financial actions before the December 31 closure.

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December 15 - Corporations

The fourth installment of the estimated tax for corporations operating on a 2025 calendar year is due. Ensuring timely payment is key to maintaining compliance and avoiding penalties.

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

Employers who adhere to monthly deposit regulations must complete their deposits of Social Security, Medicare, and withheld income taxes for November 2025 by this date. It’s also when nonpayroll withholding deposits for November should be made, following monthly deposit rules.

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December 31 - Prepare for Year-end

Completion of any final business actions is crucial before December 31. Anticipate potential closures of financial institutions and plan accordingly, ensuring that transactions don't hit unexpected roadblocks due to the holidays.

Weekends & Holidays:
If a tax deadline coincides with a weekend or legal holiday, the deadline is extended to the next business day, ensuring uninterrupted compliance.

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Disaster Area Extensions:
It's important to keep abreast of geographical areas designated as disaster zones—such designations may extend your tax deadlines. Refer to resources like FEMA and the IRS for the latest updates on disaster-related extensions.

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