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 and Acceptance Testing System (ATS) — Current valid schemas Tax year Form type 2024 Form 1042 2023 Form 1042 2022 Form 1042 Modernized e-File (MeF) schemas and business rules
