Essential December 2025 Tax Deadlines for Businesses

As December approaches, it's crucial for businesses to navigate key tax deadlines. This month entails important obligations such as corporate estimated tax payments and monthly payroll tax deposits. Additionally, ensure you finalize year-end actions before December 31, when many institutions close for the year-end holiday.

December 15 - Corporate Estimated Tax Payments

The fourth and final estimated tax installment for 2025 calendar year corporations is due on December 15. Ensure your payments are accurate to avoid penalties. Image 1

December 15 - Employer Payroll Tax Deposits

Employers following the monthly deposit rule must deposit Social Security, Medicare, and withheld income taxes for November by December 15. This deadline also applies to monthly nonpayroll withholding deposits. Image 3

December 31 - Year-End Finalization

December 31 marks the last opportunity for any outstanding financial actions. Due to potential closure of some financial institutions, plan ahead to ensure all necessary transactions are accomplished.

Weekend and Holiday Extensions:

When a due date falls on a weekend or legal holiday, it automatically extends to the next business day. These extensions are designed to help businesses manage timelines effectively without penalty.

Disaster Area Extensions:

In cases where geographical areas are declared disaster zones, tax deadline extensions are granted. For updates and details on disaster declarations, visit these resources:

FEMA: https://www.fema.gov/disaster/declarations
IRS: https://www.irs.gov/newsroom/tax-relief-in-disaster-situations

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