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Tax year 2021 MeF schemas and business rules for individual tax returns and extensions. Throughout the year, multiple versions of business rules and schemas may be in use at the same time. For each version, the tables below reflect the effective dates in the Assurance Testing System (ATS) and production system.

Information and technical guidance for software developers and transmitters who are interested in developing software for AIR for Tax Year 2021. Included are links to Known Issues, XML Schemas, and Business Rules.

Release memo for tax year 2021 version 2.0

Release memo tax year 2021 version 5.1

Release memo tax year 2021 version 5.2

Tax year 2021 version 5.0

Release memo for tax year 2021 Modernized e-File schema and business rules for individual tax returns version 5.4

This page contains a list of the approved IRS e-file Providers who have passed the Assurance Testing System (ATS) requirements for Software Developers of electronic Employment Tax Returns for Tax Year 2021.

Interim electronic filing direction for Schedules K-2 and K-3 in tax year 2021.

Providers listed on this page are approved IRS Modernized e-File (MeF) providers; however, they are not part of, nor do they have any special relationship with the Internal Revenue Service.