S-Corporations and Partnerships

Initial:  March 15th of the following year or the first Monday afterwards

Extension:  September 15th of the following year or the first Monday afterwards

Corporations

Initial:  April 15th of the following year or the first Monday afterwards

Extension:  October 15th of the following year or the first Monday afterwards

Non-Profit

Initial:  May 15th of the following year or the first Monday afterwards

Extension:  November 15th of the following year or the first Monday afterwards

Fiduciary

Initial:  April 15th of the following year or the first Monday afterwards

Extension:  September 30th  of the following year or the first Monday afterwards