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  and Publication 4164 . Test Scenarios for 1065 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.

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 Start: 03/08/2020
End: TBD
Start: 3/22/2020
End: TBD
11/16/2020 Business Rules updates provided
2018v4.1 11/28/2018 Start:12/30/2018
End: TBD
Start: 01/08/2019
End: TBD
2018v4.0 10/17/2018 Start: 12/09/2018
End: TBD
Start: 01/08/2019
End: TBD
Refer to 1065 ATS Known Issues and Solutions 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