January 15 - 4th quarter estimated taxes due - personal and corporate

March 15 - Federal Corporate Income taxes due and some states

April 15 - personal income taxes due, 1st quarter estimated taxes due, Maryland Form 1, Personal Property Taxes, OR extensions

May 15 - Non profit tax returns due

June 15 - Extended Maryland Form 1, Personal Property Taxes due, 2nd quarter estimated corporate and personal income taxes due

July 31 - Pension plan tax returns due

September 15 - Extended Corporate tax returns due, 3 quarter estimated taxes due

October 15 - Extended personal income taxes due