The following links provide information and technical guidance for Software Developers and Transmitters who are interested in developing software for the Modernized e-File Form 1042. You will find the XML Schemas, Business Rules and other useful information separated by tax year. Production & Acceptance Testing System (ATS) - Current Valid Schemas Tax Year Form Type 2022 Form 1042 Modernized e-File (MeF) Schemas and Business Rules
