December 2025: Essential Business Tax Deadlines

As December approaches, businesses must prepare for crucial tax-related responsibilities, encompassing corporate estimated tax installments and monthly payroll obligations. Additionally, it’s important to finalize all year-end actions before the December 31 closure.

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December 15 - Corporate Estimated Taxes

Corporations operating on a calendar year basis should note that the payment for the fourth installment of estimated taxes is due by this date.

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December 15 - Employer Payroll Taxes

Employers bound by monthly deposit rules must ensure their deposits for Social Security, Medicare, and income tax withheld for November 2025 are submitted by this deadline. This also applies to nonpayroll withholdings when the monthly deposit rule is in effect.

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December 31 - Year-End Considerations

It's pivotal to commence crucial actions before December 31, as certain financial institutions may not operate on this day. Preparing earlier mitigates risk and ensures coverage.

Weekend & Holiday Adjustments:

In instances where due dates coincide with weekends or public holidays, deadlines extend to the following business day that isn’t a holiday.

Extended Deadlines for Disaster Areas:

Areas declared as disaster zones receive filing extensions. For updated information on declared disaster areas and related tax relief, visit:
FEMA: https://www.fema.gov/disaster/declarations
IRS: https://www.irs.gov/newsroom/tax-relief-in-disaster-situations

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