2018 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 2018.

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 1120 family can be found on the ATS Updates Page. 

XML Schemas, Business Rules and 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 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 rules packages.

Instructions for accessing the SOR mailbox (PDF).

Tax Year 2018 Documents

• Tax Year 2018 1120 MeF Accepted Forms and Schedules (PDF)
• Tax Year 2018 1120 MeF Forms Attachment Listing (XLSX) 
• Tax Year 2018 1120 MeF Return Due Dates (PDF)
• Tax Year 2018 Stylesheets:  MeF Stylesheets
• Known e-file Issues and Solutions (XLSX)

Form 1120, 1120S, 1120-F links to TY2018 Release Memos

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

Modernized e-File (MeF) Schemas and Business Rules