2019 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 Forms 1120, 1120S, and 1120-F  for Tax Year 2019.

Developers and other Authorized IRS e-file Providers can find information on e-filing returns through MeF in Publication 4163  PDF and Publication 4164  PDF. 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 Form 1120 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 Schema and Business Rule packages.

Instructions for accessing the SOR mailbox PDF

Tax Year 2019 Documents

Form 1120, 1120S, 1120-F links to TY2019 Release Memos

Version Available Dates ATS Dates Production Dates Comments
2019v5.2 10/19/2020 Start: 11/22/2020 TBD Business rule updates provided 11-21-2020
Available in ATS 12-13-2020 
2019v5.1 02/14/2020 Start: 03/08/2020 Start: 03/22/2020

 and 07/22/2020
 Business rule updates provided
 Business rule updates provided
(Available for ATS 11/02/2020)

2019v5.0 12/05/2019 Start: 12/29/2019 Start: 01/07/2020 01/27/2020
 Business rule updates provided
2019v4.0 10/15/2019 Start: 12/08/2019
End: 12/28/2019
Not Valid for Production  
2019v3.0 09/03/2019 Start: 11/04/2019

End: 12/07/2019
Not Valid for Production  
2019v2.0 07/23/2019 Not Valid for ATS Not Valid for Production  
2019v1.0 06/11/2019 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