2020 Valid XML Schemas and Business Rules for 1120, 1120S, and 1120-F 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) Forms 1120, 1120S, and 1120-F  for Tax Year 2020.

Developers and other Authorized IRS e-file Providers can find information on e-filing returns through MeF in Publication 4163 and Publication 4164. Directions for Corporations required to e-file can be found through the e-file for Large and Mid-Size Corporations website. Test Scenarios for the 1120 Form Family 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 and Production.

Form 1120 Schemas and Business Rules 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 Schemas and Business Rules packages.

Instructions for accessing the SOR mailbox

Tax Year 2020 Documents

Form 1120, 1120S, 1120-F links to TY2020 Release Memos

Version Available Dates ATS Dates Production Dates Comments
2020v5.2 06/14/2021

Start: 10/1/2021
End: TBD

Start: PY 2022
End: TBD

Business Rule updates provided 09/02/2021
2020v5.1 02/09/2021 Start: 03/07/2021
End: TBD

Start: 03/21/2021
End: TBD

Business Rule updates provided 04/22/2021
2020v5.0  11/21/2020

Start: 12/13/2020
End: TBD

Start: 01/08/2021
End: TBD

2020v4.0 10/19/2020 Start: 11/22/2020
End: 12/13/2020
Not Valid for Production  
2020v3.0 09/02/2020 Start: 11/02/2020
End: 11/22/2020
Not Valid for Production  
2020v2.0 07/22/2020 Not Valid for ATS Not Valid for Production  
2020v1.0 06/15/2020 Not Valid for ATS Not Valid for Production  

Current Valid XML Schemas and Business Rules for 1120/1120S/1120-F

Modernized e-File (MeF) Schemas and Business Rules