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Key December 2025 Tax Deadlines for Businesses

As December approaches, businesses face several important tax deadlines. It's crucial to remain compliant and ensure that all necessary tax payments and filings are completed before the year ends. Understanding these deadlines can prevent costly penalties and streamline your financial operations.

December 15 - Corporate Tax Installment

Corporations must submit the fourth installment of their estimated tax payments for the calendar year of 2025 by this date. Timely payments are essential to avoid interest charges and late penalties.

December 15 - Payroll Tax Deposits

Employers who follow the monthly deposit rules need to complete their deposits for Social Security, Medicare, and withheld income taxes by December 15, covering November 2025 obligations. Similarly, the nonpayroll withholding deposits are due if monthly rules apply.

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Year-End Preparations - December 31

It's crucial to finalize year-end actions before December 31, as this is the last day for many financial activities. Some businesses and financial institutions might close early or not operate on December 31, which necessitates planning ahead to avoid disruptions.

Public Holidays and Weekends

When a tax due date falls on a weekend or a federal holiday, the deadline automatically extends to the next business day. This provides extra time without incurring penalties.

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Extensions in Disaster Areas

In areas declared as disaster zones, the IRS and other agencies may extend tax-related deadlines. To check if you qualify for these extensions, visit FEMA and IRS websites for the latest updates.

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