2021 XML Schemas and Business Rules for Form 1041 Modernized e-File (MeF)


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 1041 for Tax Year (TY) 2021. Included are the XML Schemas, Business Rules, Release Memorandum and specific instructions.

Developers and other Authorized IRS e-file Providers can find information on e-filing returns through MeF in the Publication 4163 and Publication 4164. Test Scenarios for Form 1041 can be found on the Modernized e-File (MeF) Assurance Testing System (ATS) page.

XML Schemas, Business Rules and Release Memos - Throughout the year, multiple versions of these documents may be in use at the same time. Special attention should be paid to the Release Memo issue date and the projected start and end dates for Assurance Testing System (ATS) and Production.

Tax Year 2021 Documents

Form 1041 links to TY2021 Schemas, Business Rules and Release Memos

Version Available Date ATS Dates Production Dates Comments
2021v3.0 09/02/2021 Not Valid for ATS Not Valid for Production  
2021v2.0 07/22/2021 Not Valid for ATS Not Valid for Production  
2021v1.0 06/10/2021 10/12/2021 Not Valid for Production


Current Valid XML Schema and Business Rules for 1041 Modernized e-File (MeF)

Modernized e-File (MeF) Schemas and Business Rules