AATS Shutdown/Cutover for Filing Season 2026/Tax Year 2025

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QuickAlerts for Electronic ACA Information Returns October 15, 2025 Subject:  AATS Shutdown/Cutover for Filing Season 2026/Tax Year 2025 The AATS environment will be unavailable beginning Wednesday, 10/29/2025, at 5 p.m. Eastern time through Monday, 11/3/2025, at 9 a.m. Eastern time. IRS will update AATS programming for Filing Season 2026/Tax Year 2025 during that time. Please do not attempt to access the Application to Application (A2A) and User Interface (UI) Channels during the Shutdown period. The AATS environment will be available beginning Monday, 11/3/2025, at 9 a.m. Eastern time, for Filing Season 2026/Tax Year 2025 testing, which includes Tax Year(s) 2025, 2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016 and 2015. Beginning 11/3/2025, Tax Year 2025 will be the current year in AATS. Tax Year(s) 2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016 and 2015 will be accepted as prior year returns in AATS. The Production environment will still be available during the AATS Shutdown, except for the routine maintenance window that occurs each Sunday. Tax Year 2024 is still the current year in Production. Tax Year(s) 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016 and 2015 are still accepted as prior year returns in Production. Back to Top Thank you for subscribing to QuickAlerts for Electronic ACA Information Returns, an IRS e-mail service. If you know someone who might want to subscribe to this mailing list, please forward this message to them so they can subscribe. This message was distributed automatically. Please Do Not Reply To This Message. e-file Resources QuickAlerts Library QuickAlerts Article QuickAlerts Brochure e-file for Tax Pros Software Developers IRS.gov Refund Information Other Useful Links Tax Professionals Forms and Instructions Partners & Stakeholders IRS Training and Communication Tools e-Services Disaster Relief Internal Revenue Bulletins

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