Pass-through entity owners: Beware the Ides of March. Shakespeare’s words don’t apply just to Julius Caesar; they also apply to calendar-year partnerships, S corporations and limited liability companies treated as partnerships or S corporations for tax purposes. Why? The Ides of March, better known as March 15, is the federal income tax filing deadline for these entities. If you haven’t filed your return and are worried about having sufficient time to complete it, you can avoid the tragedy of a late return by filing for an extension. Contact us with questions.