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Key December 2025 Tax Deadlines for Businesses

As December rolls in, businesses must gear up for crucial tax deadlines that could impact their financial health as the year concludes. From corporate estimated tax obligations to payroll and other withholdings, understanding these due dates is vital to ensure compliance and smooth operations. Additionally, it's a time to prepare for year-end activities to avoid any last-minute rushes due to closures on December 31.

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December 15 - Corporations

This date marks the deadline for corporations on a calendar year to submit the fourth installment of their estimated tax for 2025. Missing this can result in penalties, so timely submission is crucial for maintaining good financial standing.

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

For employers bound by the monthly deposit rule, December 15 is the critical due date to deposit taxes relating to Social Security, Medicare, and any withheld income for November 2025. The same deadline applies to nonpayroll withholding deposits if governed by the monthly deposit rule.

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December 31 - Year-End Finalization

Consider this date with caution as many financial institutions might close early or remain closed. Therefore, actions requiring execution before January should be taken sooner to prevent any scheduling conflicts. Coordination with your accounting team is recommended to ensure all year-end financial actions are completed smoothly.

Holiday and Weekend Extensions

Should a tax deadline fall on a weekend or legal holiday, it is generally extended to the next business day, ensuring that businesses have sufficient time to meet their obligations.

Disaster Area Extensions

If your business is located in a designated disaster area, tax deadlines may be extended. For comprehensive information, check FEMA’s disaster declarations website or the IRS's tax relief section for the most up-to-date information regarding filing extensions.

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