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Essential December 2025 Tax Deadlines for Businesses

As December unfolds, businesses must remain vigilant about crucial tax deadlines, including corporate estimated tax payments and routine payroll tax deposits. It's essential to finalize year-end actions before the close of business on December 31.

December 15 - Corporate Estimated Tax Payments

Corporations operating on a 2025 calendar year should prepare to remit their fourth estimated tax installment by this date.

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December 15 - Employer Payroll Tax Responsibilities

Employers adhering to monthly deposit requirements must deposit November's Social Security, Medicare, and withheld income taxes by this deadline. This date also applies to nonpayroll withholding deposits if monthly rules are applicable.

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December 31 - Critical Year-End Considerations

It's vital to complete any necessary financial actions well before December 31 to accommodate potential early closures of financial institutions.

Weekend & Holiday Adjustments:

If any deadline coincides with a weekend or federal holiday, it is automatically postponed to the next business day that isn’t itself a holiday.

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Considerations for Disaster Areas:

Designated disaster areas can receive deadline extensions. To confirm if an area qualifies and to verify updated filing deadlines, refer to these resources:

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