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Key Business Tax Deadlines in December 2025

Ah, December! The season of holiday cheer and last-minute business tax planning. As a reminder for all you entrepreneurs and small business owners out there, December is a critical month to tie up your financial loose ends. Let’s dive into the important tax deadlines this month, so you can enjoy your New Year’s celebrations stress-free.

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December 15 - Corporations

This date marks the due day for corporations to pay the fourth installment of estimated taxes for the 2025 calendar year. Make sure to mark it on your calendar!

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

If monthly deposit rules apply to you as an employer, you need to deposit your Social Security, Medicare, and withheld income tax for November by this date. This also applies to nonpayroll withholding deposits for November 2025 if the same rules apply.

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December 31 - Plan Your Year-End Actions Wisely!

The last day of the year can be a challenge if you’re attempting to complete last-minute financial actions. Keep in mind that not all financial institutions are open, so plan ahead!

Remember, if a tax deadline lands on a weekend or legal holiday, the deadline extends to the next business day. Always stay ahead of these dates to avoid unnecessary fines or penalties.

Disaster Area Extensions

If you're in a region declared as a disaster area, you might receive extensions on your due dates. Check these resources for updates:
FEMA Disaster Declarations
IRS Tax Relief in Disaster Situations

Stay informed, stay prepared, and let’s make 2025 a prosperous year for your business.

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