Publication 1346

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Electronic Return File Specifications for Individual Tax Returns


This publication outlines the communications procedures, transmission formats, character sets, validation criteria, and error reject conditions for individual income tax returns filed electronically via telephone lines to participating Internal Revenue Service Centers. Also covered are the formats for statement records, examples of types of records, and explanations of the Acknowledgement files transmitted to electronic filers.

The File Specifications (Part I) must be used in conjunction with the Record Layouts (Part II) and the corresponding version of the Handbook for Electronic Return Originators of Individual Income Tax Returns, Publication 1345. Software developers and transmitters should use both publications and must transmit test returns from the IRS developed Test Package for Electronic Filers of Individual Income Tax Returns, Publication 1436, which is revised yearly. Tax preparers who use a transmission service will need only Publication 1345.

  • Part 1 – File Specification
  • Part 2 – Record Layouts
  • Part 3 – Electronic Transmitted Documents


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