Free IRIS XML validator Tax Year 2026

IRS IRIS XML Validator

Upload or paste any TY2026 IRIS A2A XML file for a private, line-level format check.

Your XML is checked on this device and is never uploaded by this validator.

Important

A format check is not IRS acceptance

This free tool checks XML structure and data formats only. It does not verify the accuracy, correctness, completeness, or legal sufficiency of tax data, and it does not apply every IRS business rule or guarantee acceptance. You are responsible for reviewing the XML and filing outcome.

To the fullest extent permitted by law, BoomTax is not responsible for errors, omissions, rejected filings, penalties, or losses arising from use of this tool.

Use of this tool is subject to the BoomTax Terms and Conditions.

IRIS schema validation for developers

Every TY2026 IRIS intake form type

Every intake form type

Check complete TY2026 IRIS A2A transmissions across the 1097, 1098, 1099, 3921, 3922, 5498, W-2G, 1042-S, 8027, 8596, 8809, and 8955-SSA families included in the IRS package.

Useful developer feedback

See line numbers and readable diagnostics for malformed XML, missing elements, invalid values, and unexpected structure.

Private by design

Your XML stays in this browser tab. The validator does not send filenames, XML, TINs, names, addresses, or amounts to BoomTax.

How it works

How to validate an IRS IRIS XML file

  1. 1
    Add your XML

    Upload a complete transmission file or paste the XML directly.

  2. 2
    Check it locally

    Validate the document against the complete TY2026 IRIS intake format.

  3. 3
    Review the result

    Use the line-level report to resolve issues before your filing workflow.

Common questions

IRIS XML validator FAQ

How do I validate an IRS IRIS XML file?

This free online XML validator is built specifically for complete TY2026 IRS IRIS A2A files. Upload a transmission or paste its XML, then select Validate IRIS XML to check it against the complete IRIS XML schema (XSD) package and get line-level format errors.

What XML files can I validate?

This page validates complete Tax Year 2026 IRIS A2A intake transmissions with an IRTransmission root element. The bundled version 5.0.7 format supports every intake form type in the TY2026 IRS package.

Does my XML leave this device?

No. File reading and validation happen locally in your browser. The validator does not upload the XML or filename to BoomTax.

What does a passing result mean?

It means the document matches the TY2026 IRIS XML schema package, also called the XSDs. IRS business rules, taxpayer data, credentials, authorization, transmission, and acceptance are separate checks.

Why are DTDs and entity declarations rejected?

IRIS intake XML does not require them. Rejecting those declarations keeps this browser tool focused on the expected IRIS document format and avoids unsafe or unexpectedly expensive entity processing.

Starting with a Publication 1220 file? Use the FIRE to IRIS converter. For element and transmission details, read the IRIS XML format guide.

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