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 Extensible Markup Language (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 and Assurance Testing System (ATS) - Current valid schemas Tax Year Form Type 2023 Form 1065 2022 Form 1065 2021 Form 1065 Modernized e-File (MeF) schemas and business rules
