The following links provide information and technical guidance for Software Developers and Transmitters who are interested in developing software for the Modernized e-File (MeF) Form 1065. You will find the XML Schemas, Business Rules, and other useful information separated by tax year. Form 1065 Stylesheets can be downloaded for use in displaying XML tax return data. Production & Acceptance Testing System (ATS) - Current Valid Schemas Tax Year Form Type 2021 Form 1065 2020 Form 1065 2019 Form 1065 Modernized e-File (MeF) Schemas and Business Rules
