Health coverage providers and applicable large employers – and those assisting them in preparation for electronically filing the 2015 health care information returns – need to understand the IRS ACA Information Return electronic filing process. Publication 5165, Guide for Electronically Filing Affordable Care Act Information Returns for Software Developers and Transmitters, outlines the communication procedures, transmission formats, business rules and validation procedures for returns transmitted electronically through the AIR system. To develop software for use with the AIR system, software developers, transmitters, and issuers should use the guidelines provided in this publication along with the XML schemas published on IRS.gov.