Key Tax Deadlines for December 2025

As December approaches, businesses must gear up for essential tax deadlines to ensure compliance and avoid potential penalties. This month is crucial for corporate estimated tax payments and regular payroll tax deposits. Here's what business owners need to prioritize before the year ends.

December 15 - Corporate Tax Obligations

Corporations operating on a calendar year must remember that the fourth installment of estimated taxes is due by December 15. Ensuring timely payments can help avoid penalties and interest.Image 2

December 15 - Payroll Tax Deposits

Employers must make deposits for Social Security, Medicare, and withheld income tax covering November 2025 by December 15, particularly if governed by monthly deposit rules. This date is also applicable to nonpayroll withholding deposits.Image 3

December 31 - Year-End Considerations

The year-end deadline on December 31 is critical for actions requiring completion before year's close. Businesses should plan accordingly, especially since some financial institutions might not operate on this date. Advance preparation is key to managing last-minute tasks.Image 1

Weekends & Holidays:
If a deadline coincides with a weekend or legal holiday, it extends to the next business day that isn’t a holiday, providing some flexibility.

Disaster Area Extensions:
In times of declared disasters, extensions on due dates can be expected. Verify if your area qualifies for disaster relief by checking updates from FEMA and the IRS.

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