States Not Adopting Federal Due Date Change for C Corporations

Please be aware, the IRS changed the due date for filing calendar year C corporation returns from 3/15 to 4/15 (or the 15th day of the fourth month following the close of the corporation’s fiscal year).  Although most states have adjusted their statutes or administrative rulings to accommodate the Federal change, there are three states (Massachusetts, Delaware, and Wisconsin) whose due dates now fall before the new Federal due date.
AAFCPAs has provided the  below chart for your convenience, which outlines additional detail regarding the process for filing extensions in these states, including whether a Federal extension will automatically act as a valid state extension so long as all taxes are properly paid in by the state due date.
States Not Adopting Federal Due Date Change for C Corporations
AAFCPAs encourages clients to take note of these nuances when planning to file corporate extensions.  While the above chart highlights those limited situations where the state due date precedes the Federal due date, there are other things to consider:

  • States whose C corporation filing date has traditionally fallen after the Federal due date might not have changed their statute. For example, New Jersey’s due date remains April 15, while Connecticut moved their date from April 1 to May 1.
  • A number of states have accelerated their partnership filing dates from April 15 to March 15 to be consistent with the change in the Federal due date.

If you have any questions about tax planning or compliance, please contact your AAFCPAs partner or Richard Weiner at 774.512.4078 or

About the Author

Rich has over 30 years of broad tax experience with a specialty in tax planning and consulting for private and publicly-held businesses. Rich has specific expertise in the Software, Bio-Technology, Medical Device, Life Science, Manufacturing, Retail, Professional Service and Publishing industries, as well as U.S. aspects of international taxation. He works extensively with European companies expanding into the U.S. market. Additional areas of focus include companies and stockholders in transition, including structuring of and planning for Mergers & Acquisitions, planning for changes in ownership and management, and adoption of tax methodologies with a view toward the long term. He is well known in his field and is a frequent speaker on a variety of tax related topics.

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