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Essential December 2025 Tax Deadlines for Businesses

As December approaches, it's crucial for businesses to stay vigilant about key tax deadlines. This month is punctuated by significant due dates, such as corporate estimated tax payments and monthly payroll obligations. Keep in mind to conclude all year-end preparations before the close of business on December 31.

December 15 - Corporate Estimated Taxes

The fourth quarter estimated tax payment for calendar year corporations in 2025 is due by this date. Ensure your accounting team is on top of this critical filing.

December 15 - Payroll Tax Deposits

Employers adhering to the monthly deposit schedule must submit their deposits for Social Security, Medicare, and withheld income taxes for November by December 15. Additionally, any nonpayroll withholdings for November are also due this day if the monthly deposit rule applies.

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December 31 - Year-End Planning Caution

For financial decisions and actions that can't be executed on December 31 or require more than one day, remember some financial institutions may close early or be unavailable that day. Plan to finalize these tasks sooner to avoid any disruptions.

Weekend & Holiday Adjustments:

If any tax due date falls on a weekend or a legal holiday, the filing period is automatically extended to the next business day that is not a holiday.

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Disaster Relief Extensions:

During times when the government designates any area as a disaster zone, tax obligations may be deferred. Consult the following resources for up-to-date information on extended deadlines: FEMA: FEMA Declarations, IRS: IRS Disaster Relief.

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