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

Developers and other Authorized IRS e-file Providers can find information on e-filing returns through MeF in Publication 4163PDF and Publication 4164PDF. 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.

Extensible Markup Language (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, 1120-F, 1120-S links to TY2020 Release Memos

Version Available Dates ATS Dates Production Dates Comments
2020v5.3 10/14/2021 Start:
End: TDB
Start: 01/07/2022
End: TBD

Business rule updates provided 

Business rule updates provided 11/14/2022

Business rule updates provided 
ATS and production dates TBD for processing year 2023

Business rule updates provided

Business rule updates provided 04/21/2022

Schema and Business rule updates provided 10/12/2021 

2020v5.2 06/14/2021

Start: 10/1/2021
End: TBD

Start: 01/07/2022
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


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

Modernized e-File (MeF) Schemas and Business Rules