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Find links to MeF form-specific information.

Modernized e-File schema and business rules for individual tax returns and extensions

Tax year 2026 valid XML schemas and business rules for Form 8849 Modernized e-File (MeF).

The IRS has mandated six (6) new security, privacy, and business standards to better serve taxpayers and protect their information collected, processed and stored by Online Providers of individual income tax returns.

Modernized e-File (MeF) Assurance Testing System (ATS) information is provided to keep you up-to-date on the latest news and status of issues.

It¡¯s the free online service that is designed to keep Tax Professionals informed of e-file issues and events almost the very moment they occur¡­ 24/7

This page contains updates/information on ETEC specific products. The intended audience is software developers for electronic excise Form(s) 720, 2290, & 8849.

Tax year 2026 Extensible Markup Language (XML) schemas and business rules for Form 8849, including new tax year form(s) and tax law changes.

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

Learn how to e-file an automated extension using Form 7004 and the restrictions that apply.