1120x TY2023v5.2 release memo


April 18, 2024

MeF 1120/1120-F/1120-S Stakeholders:

We are providing tax year 2023 Extensible Markup Language (XML) Schemas and Business Rules for the following forms that include new tax year form(s) and tax law changes.

Included in the 2023v5.2 Schema package are updated diff files which identify the difference between the 2023v5.1 Schema package and the 2023v5.2 Schema package. The XML standardization was applied and are available for program planning purposes. These Schemas and Business Rules will be available for ATS on June 2, 2024, and Production on June 16, 2024.


  • Business Rules
  • Schemas

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.

For the 1120 XML Schemas, the Instance Document contained in the Schema files is viewable with any generic Multipurpose Internet Mail Extensions (MIME) reader. See the 1120 "Instance Document" for a sample of 1120 transmission.

Business Rules are posted in two different formats which contain identical information – Adobe (PDF) and a comma-separated file (CSV). A column within the file identifies changes made from the previous version.

If you have any questions about the Schemas or Business Rules, please send your inquiry to the MeF Mailbox

1120 Form Family TY 2023 Schemas and Business Rules