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Essential December 2025 Tax Deadlines for Businesses

As December approaches, it's crucial for businesses to stay on top of important tax deadlines, such as corporate estimated tax payments and monthly payroll tax deposits. Additionally, consider finalizing year-end actions well before December 31 to account for potential closures.

December 15 - Corporate Estimated Taxes

Corporations operating on a calendar year must submit their fourth installment of estimated tax for 2025.

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December 15 - Payroll and Nonpayroll Withholdings

Employers following monthly deposit rules need to deposit Social Security, Medicare, and withheld income tax for November 2025 by this date. This deadline also applies to November's nonpayroll withholding deposits if the monthly deposit rules are relevant.

December 31 - Year-End Finalization

Try to wrap up financial activities before December 31, as some institutions might not operate on the last day of the year. Planning ahead can ensure a seamless close to the fiscal year.

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Holiday and Weekend Extensions:

In the event any deadline falls on a Saturday, Sunday, or legal holiday, businesses get an automatic extension to the next business day. It’s a useful consideration to prevent any last-minute rush.

Disaster Area Extensions:

When an area is declared a disaster zone, relevant tax due dates will be extended. For the latest updates on disaster declarations and applicable extensions, refer to the following resources:

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

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