Affordable Care Act (ACA) Assurance Testing System (ATS) Opening Date

Internal Revenue Service (IRS) sent this bulletin at 10/16/2026 09:26 AM EDT

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QuickAlerts for Electronic ACA Information Returns

October 16, 2026

Subject: Affordable Care Act (ACA) Assurance Testing System (ATS) Opening Date

 

Attention: Transmitters, Software Developers, and Issuers

The AATS environment will be available beginning Friday, October 16, 2026, for Filing Season 2027/Tax Year 2026 testing, which only includes Tax Year 2026. Prior year testing will not be available at this time.

 

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