Key December 2025 Tax Deadlines for Businesses

As December rolls around, business professionals and accountants must stay vigilant about crucial tax deadlines for the month. With responsibilities like corporate estimated tax payments and payroll tax deposits, it’s critical to wrap up year-end tasks before financial institutions and businesses close their books for 2025.

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December 15 - Corporate Tax Installments

The deadline for corporations to submit their fourth installment of estimated tax for the 2025 calendar year is December 15. Ensure that these payments are timely to avoid penalties and ensure smooth operations.

December 15 - Employer Tax Responsibilities

For employers under the monthly deposit regulations, December 15 marks the due date for depositing Social Security, Medicare, and withheld income tax for November 2025. If the monthly deposit rule applies to your nonpayroll withholding, this is also the deadline to make those deposits.

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December 31 - Important Year-End Actions

December 31 is the final day for completing critical financial actions. However, consider acting before this date as several institutions might be closed. Delays could impact your financial outcomes.

Mind the Weekends & Holidays

Should any deadline fall on a weekend or a legal holiday, the due date is extended to the next business day. Plan accordingly to avoid last-minute rushes.

Extensions for Disaster Areas

Recognize that filing extensions are available for those in designated disaster areas. For the latest updates, check the FEMA and IRS websites to see if you qualify and to understand the new deadlines.

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