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Essential December 2025 Tax Deadlines for Businesses

December is a crucial month for businesses to finalize their tax-related activities, particularly in preparing for the upcoming year. Key deadlines are fast approaching for corporate estimated tax payments and essential payroll tax deposits. Companies should also ensure all year-end procedures are completed by December 31st to avoid setbacks due to holiday closures.

December 15: Corporate Estimated Taxes

The fourth quarter estimated tax payment for corporations with a calendar year-end is due today. Corporations should ensure this installment is filed to avoid penalties and keep financials in good standing.Image 2

December 15: Payroll Tax Deposits

Employers adhering to the monthly deposit rule must submit their deposits for Social Security, Medicare, and withheld income taxes for November by this deadline. Additionally, non-payroll withholding for November is also due if the monthly deposit criteria apply.

December 31: Year-End Finalization

With the end of the fiscal year imminent, it's critical to ensure all necessary transactions and activities are wrapped up before potential interruptions on December 31st. Many financial institutions may close early, warranting actions done in advance.

Weekends & Holidays: Note that any due date landing on a weekend or legal holiday is deferred to the next official business day.Image 3

Disaster Area Extensions:

Federal extensions may apply if your business resides in a federally designated disaster area. Check the FEMA and IRS websites for the latest updates on relief measures and extended deadlines.Image 1

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