Publication 4163 - Modernized e-File (MeF) Information for Authorized IRS e-File Providers - Tax Returns Processed in Year 2026

Sep 17, 2026

Publication 4163 (Rev. 12-2025) explains Modernized e-File (MeF) for authorized IRS e-file providers handling business tax returns. It outlines the processing context for tax returns processed in Year 2026 and details key responsibilities, provider types, and required electronic identifiers. The document covers how to use Publication 4163, how to communicate with IRS (including MeF Status Page), and an overview of MeF benefits and updates, including forms and schema changes for the processing year.

LanguageEnglish

CategoryGeneral

FormatPDF

Pages96

Reading Time34 min

AccessFree to download

Processing Year 2026 Nature of Substantive Changes

Introduction and General Information

What is Modernized e-File (MeF)?

Using Publication 4163

General Information

Authorized IRS e-File Providers

Communicating with IRS

Overview and Benefits of MeF

New for Processing Year

Forms for Processing Year 2026

Publication 4163 Modernized e-File (MeF) Information for Authorized IRS e-File Providers for Business Returns Tax Returns | Processed in Year 2026 Publication 4163 (Rev. 12-2025) Catalog Number 36165C Department of [the Treasury](the Treasury Internal Revenue Service www.IRS.gov)[ Internal Revenue Service](the Treasury Internal Revenue Service www.IRS.gov)[ www.IRS.gov](the Treasury Internal Revenue Service www.IRS.gov) The Internal Revenue Service Mission Provide America’s taxpayers top quality service by helping them understand and meet their tax responsibilities and enforce the tax law with integrity and fairness to all. Table of Contents Processing Year 2026 Nature of Substantive Changes.................................1 1 Introduction and General Information...................................................2 1.1 What is Modernized e-File (MeF)? ........................................................................................................... 2 1.2 Using Publication 4163 .............................................................................................................................. 2 1.3 General Information .................................................................................................................................. 2 1.4 Authorized IRS e-File Providers ............................................................................................................... 2 1.4.1 Electronic Filing Identification Numbers (EFINs), Electronic Transmitter Identification Numbers (ETINs), and Passwords ......................................................................................................................... 2 1.4.2 Electronic Return Originator (ERO) ......................................................................................................... 3 1.4.3 Transmitter .............................................................................................................................................. 3 1.4.4 Software Developer ................................................................................................................................. 4 1.4.5 Online Provider ........................................................................................................................................ 5 1.4.6 Intermediate Service Provider (ISP) ........................................................................................................ 6 1.4.7 Reporting Agent ...................................................................................................................................... 6 1.4.8 Large Taxpayer ....................................................................................................................................... 6 1.5 Communicating with IRS........................................................................................................................... 6 1.5.1 MeF Status Page ..................................................................................................................................... 7 1.5.2 Helpful Publications and Information ....................................................................................................... 7 1.6 Overview and Benefits of MeF .................................................................................................................. 9 1.7 New for Processing Year......................................................................................................................... 10 1.7.1 Forms .................................................................................................................................................... 10 1.7.2 Schema Updates ................................................................................................................................... 11 1.8 Forms for Processing Year 2026 ..............................................

FAQs

What is Modernized e-File (MeF) according to Publication 4163?

Publication 4163 defines Modernized e-File (MeF) and explains its role for authorized IRS e-file providers preparing and submitting tax returns. It provides an introduction and general information section dedicated to MeF.

Which kinds of authorized e-file providers are covered?

The document lists multiple authorized provider types, including electronic filing identification number holders and roles such as ERO, transmitter, software developer, online provider, ISP, reporting agent, and large taxpayer categories.

How does Publication 4163 help providers communicate with the IRS?

It includes a section on communicating with IRS, featuring the MeF Status Page and pointing to helpful publications and information needed during processing.

Sep 17, 2026

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