https://www.irs.gov/vi/e-file-providers/release-memo-for-form-94x-modernized-e-file-mef-annual-forms-2023v3-point-0
Release memo for Form 94x Modernized e-File (MeF) annual forms (2023v3.0) | Internal Revenue Service
We are providing tax year 2023 Extensible Markup Language (XML) schemas and business rules for Form 94x that include new tax year form(s) and tax law changes.