QuickAlerts - Information Returns Intake System (IRIS) Assurance Testing System (ATS) Available

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QuickAlerts for Tax Professionals

October 5, 2026

Subject: Information Returns Intake System (IRIS) Assurance Testing System (ATS) Available

Attention: Software Developers and Information Return Transmitters

Beginning Monday, October 5, 2026, at 9:00 a.m. ET, the Information Returns Intake System (IRIS) Assurance Testing System (ATS) environment will be available for Tax Year 2026/Processing Year 2027 (TY26/PY27).

Tax Year 2026 will be the current tax year in the IRIS ATS environment. Tax Years 2025, 2024, 2023 and 2022 will be available as prior year returns.

Important Schema Version Information

For IRIS ATS, use the following Schema Version requirements:

Tax Year 2026: Use Schema Version 5.0.7
Tax Year 2025: Use Schema Version 5.0.3
Tax Years 2022–2024: The SchemaVersionNum element is not required

Tax Year 2025 will be updated to Schema Version 5.0.7. A QuickAlert will be distributed when this update is implemented.

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