December 2025 Business Due Dates

December brings key business tax deadlines, including corporate estimated tax payments and monthly payroll tax deposits. Plus, a reminder to complete year-end actions before closures on December 31.

December 15 - Corporations

The fourth installment of estimated tax for 2025 calendar year corporations is due.

December 15 - Social Security, Medicare and Withheld Income Tax

If you are an employer and the monthly deposit rules apply, December 15 is the due date for you to make your deposit of Social Security, Medicare, and withheld income tax for November 2025. This is also the due date for the nonpayroll withholding deposit for November 2025 if the monthly deposit rule applies.

December 31 - Caution! Last Day of the Year

If the actions you wish to take cannot be completed on the 31st or in a single day, you should consider taking action earlier than December 31st, as some financial institutions may be closed  that day.

Weekends & Holidays:

If a due date falls on a Saturday, Sunday or legal holiday, the due date is automatically extended until the next business day that is not itself a legal holiday. 

Disaster Area Extensions:

Please note that when a geographical area is designated as a disaster area, due dates will be extended. For more information whether an area has been designated a disaster area and the filing extension dates visit the following websites:

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

Share this article...

Want our best tax and accounting tips and insights delivered to your inbox?

Sign up for our newsletter.

I confirm this is a service inquiry and not an advertising message or solicitation. By clicking “Submit”, I acknowledge and agree to the creation of an account and to the and .

Privileged And Confidential
This communication and any accompanying documents are confidential and privileged. They are intended for the sole use of the addressee. If you receive this transmission in error, you are advised that any disclosure, copying, distribution, or the taking of any action in reliance upon this communication is strictly prohibited. Moreover, any such disclosure shall not compromise or waive the attorney-client, accountant-client, or other privileges as to this communication or otherwise. If you have received this communication in error, please contact me at the above email address. Thank you.

Disclaimer
Any accounting, business or tax advice contained in this communication, including attachments and enclosures, is not intended as a thorough, in-depth analysis of specific issues, nor a substitute for a formal opinion, nor is it sufficient to avoid tax-related penalties. If desired, Tobi Li Marshall CPA, APC would be pleased to perform the requisite research and provide you with a detailed written analysis. Such an engagement may be the subject of a separate engagement letter that would define the scope and limits of the desired consultation services.