TY 2018 Valid XML Schemas and Business Rules for Form 1065 Modernized e-file (MeF)


The links below provide information and technical guidance for Software Developers and Transmitters who are interested in developing software for the Modernized e-File (MeF) Form 1065 for Tax Year (TY) 2018.

Developers and other Authorized IRS e-file Providers can find information on e-filing returns through MeF in the Publication 4163 (PDF) and Publication 4164 (PDF). Test Scenarios for 1065 and 1065B can be found on the ATS Updates Page.

XML Schemas, Business Rules and Release Memo - 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.

Form 1065 Schemas and Business Rules Distribution are now distributed through the Registered User Portal and your e-services mailbox. This mailbox is part of the Secure Object Repository (SOR). Users will access their mailbox in their existing e-services account to pick up the schema and business rules packages.

Tax Year 2018 Documents

Form 1065 links to TY2018 Release Memos


Available Date

ATS Date

Production Date


2018v4.2 2/12/2020 3/8/2020 3/22/2020  
2018v4.1 11-28-2018 12-30-2018 01-08-2019  
2018v4.0 10-17-2018 12-09-2018 01-08-2019 Refer to 1065 ATS Known Issues and Solutions (PDF) to view the schema version available for ATS testing.

Current Valid XML Schemas and Business Rules for 1065 Modernized e-File (MeF)

Modernized e-File (MeF) Schemas and Business Rules