Affordable Care Act (ACA) information returns and transmittals are electronically filed through the ACA Information Return system, also known as AIR.
Affordable Care Act Assurance Testing System (AATS) Information Returns for Filing Season 2021/Tax Year 2020
AATS will be unavailable beginning Tuesday, October 27, 2020, at 5:00 p.m. Eastern time through Monday, November 02, 2020, at 7:00 a.m. Eastern time. AIR will update programming for Filing Season (aka Processing Year) 2021 AATS during that time.
AATS will be available beginning Monday, November 02, 2020, at 7:00 a.m. Eastern time, for Filing Season 2021 testing. Filing Season 2021 testing includes Tax Years 2020, 2019, 2018, 2017, 2016 and 2015.
|Tax Years Available||2015, 2016, 2017, 2018 and 2019||2015, 2016, 2017, 2018 and 2019|
*Scheduled Maintenance Build:
A routine maintenance build is scheduled every Sunday. The system will be unavailable from 12:00 a.m. to 12:00 p.m. Eastern time.
For more information regarding AIR, please see the AIR page on IRS.gov.