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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.
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