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Key December 2025 Tax Deadlines for Businesses

As December rolls around, it’s crucial for business owners to stay on top of essential tax deadlines that can impact financial health as we close out the year. This includes ensuring corporate estimated tax payments and monthly payroll tax obligations are met, along with completing year-end financial actions before businesses shutter on December 31.

Tax preparations

December 15 - Corporations

Mark your calendars! The fourth and final installment of estimated tax for calendar-year corporations for 2025 is due on this date. Make sure your payment is submitted to avoid unnecessary penalties.

December 15 - Social Security, Medicare, and Withheld Income Tax

Employers adhering to the monthly deposit rule must deposit Social Security, Medicare, and withheld income tax for November 2025 by December 15. Additionally, this deadline applies to the nonpayroll withholding deposit if you follow the monthly deposit rule for the last month of the year.

December 31 - Last Day to Act

The end of the year is marked by a flurry of financial and tax activities. If certain actions cannot be wrapped up on December 31st, or if they require more than a day, it’s advisable to finish them ahead of time given that some financial institutions may be closed.

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Weekends & Holidays

On those occasions when a tax deadline falls on a Saturday, Sunday, or recognized holiday, the due date is automatically deferred to the next business day. Make sure to plan accordingly.

Disaster Area Extensions

Regions designated as disaster areas receive automatic filing extensions. For detailed information on affected areas and applicable extension dates, check the following resources: FEMA: FEMA Disaster Declarations
IRS: IRS Tax Relief in Disaster Situations

And remember, if your business is in need of expert tax consultation to navigate these dates, Michael Dolezal & Co, serving the Northeast Ohio area, is here to ensure your financial obligations are met with precision and care.

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