Do you operate a business as a partnership, a limited liability company (LLC) treated as a partnership for tax purposes or an S corporation? In tax lingo, these are called “pass-through” entities because their taxable income items, tax deductions and tax credits are passed through to their owners and taken into account on the owners’ federal income tax returns. These entities generally don’t owe any federal income tax themselves. Here are some important things to know about tax filing for pass-through entities. March 16 deadline Even though pass-through entities generally don’t owe federal income tax at the entity level, they still must file a federal income tax return. Partnerships and LLCs treated as partnerships for tax purposes file Form 1065, “U.S. Return of Partnership Income.” S corporations file Form 1120-S, “U.S....