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Information for each tax year/processing year is listed below.
Publication 5164, Test Package for Electronic Filers of Affordable Care Act (ACA) Information Returns (AIR) PDF has additional details on the different scenarios and who is required to test for each tax year.
General instructions PDF for tax years 2022 and beyond.
Tax year 2025/Processing year 2026 AATS testing: TBD.
These scenarios use the most current copy of the forms.
| AATS scenarios | Tax period | AATS known issues and solutions |
|---|---|---|
| 2025 | Update: TBD Known issues for scenarios |
Tax year 2024/Processing year 2025 AATS testing: 11/01/2024.
These scenarios use the most current copy of the forms.
| AATS scenarios | Tax period | AATS known issues and solutions |
|---|---|---|
| 2024 | Update: TBD Known issues for scenarios |
Tax year 2023/Processing year 2024 AATS testing began on Nov. 1, 2023.
| AATS scenarios | Tax period | AATS known issues and solutions |
|---|---|---|
| 2023 | Update: TBD Known issues for scenarios |
Tax year 2022/Processing year 2023 AATS testing began on Nov. 1, 2022.
| AATS scenarios | Tax period | AATS known issues and solutions |
|---|---|---|
| 2022 | Update: TBD Known issues for scenarios |
Tax year 2021/Processing year 2022 AATS testing began on Nov. 2, 2021.
| AATS instructions | AATS scenarios | Tax period | AATS known issues and solutions |
|---|---|---|---|
| AATS instructions PDF | 2021 | Update: TBD Known issues for scenarios |
Tax year 2020/Processing year 2021 AATS testing began on Nov. 2, 2020.
| AATS scenarios | Tax period | AATS known issues and solutions |
|---|---|---|
| 2020 | Update: TBD Known issues for scenarios |
Tax year 2019/Processing year 2020 AATS testing began on Nov. 1, 2019.
Predefined AATS scenarios
| Instructions | Predefined AATS narratives | Predefined AATS answer keys | Tax periods | AATS scenario known issues and solutions |
|---|---|---|---|---|
| Predefined scenario instructions PDF | 2019 | Update: 9/28/2020 Known issues for scenarios PDF |
Criteria-based AATS scenarios
| Instructions | Criteria-based AATS narratives | AATS answer keys | Tax periods | AATS scenario known issues and solutions |
|---|---|---|---|---|
| Criteria-based AATS scenarios instructions PDF | N/A: Criteria-based scenarios do not have answer keys since the transmitter has more flexibility in the data that is submitted. Please refer to Publication 5164 for more details. | 2019 | Update: 9/28/2020 |
Tax year 2018/Processing year 2019 ACA AATS testing began on Nov. 2, 2018.
Predefined AATS scenarios
| Instructions | Predefined AATS narratives | Predefined AATS answer keys | Tax periods | AATS scenario known issues and solutions |
|---|---|---|---|---|
| Predefined scenario instructions PDF | 2018 | Update: 11/01/2018 |
Criteria-based AATS scenarios
| Instructions | Criteria-based AATS narratives | AATS answer keys | Tax periods | AATS scenario known issues and solutions |
|---|---|---|---|---|
| Criteria-based AATS scenarios instructions PDF | N/A: Criteria-based scenarios do not have answer keys since the transmitter has more flexibility in the data that is submitted. Please refer to Publication 5164 for more details. | 2018 | Update: 11/01/2018 |
Tax year 2017/Processing year 2018 ACA AATS testing began on Oct. 31, 2017.
Predefined AATS scenarios
| Instructions | Predefined AATS narratives | Predefined AATS answer keys | Tax periods | AATS scenario known issues and solutions |
|---|---|---|---|---|
| Predefined scenario instructions PDF | 2017 | Update: 11/1/2018 |
Criteria-based AATS scenarios
| Instructions | Criteria-based AATS narratives | AATS answer keys | Tax Periods | AATS scenario known issues and solutions |
|---|---|---|---|---|
| Criteria-based AATS Scenarios Instructions PDF | N/A: Criteria-based Scenarios do not have answer keys since the transmitter has more flexibility in the data that is submitted. Please refer to Publication 5164 for more details. | 2017 | Update: 11/01/2018 |
Tax year 2016/Processing year 2017 ACA AATS testing was open for testing in early Nov. 2016.
Predefined AATS scenarios
| Instructions | Predefined AATS narratives | Predefined AATS answer keys | Tax periods | AATS Scenario known issues and solutions |
|---|---|---|---|---|
| Predefined scenario instructions PDF | 2016 | Update: 1/19/2017 |
Criteria-based AATS scenarios
| Instructions | Criteria-based AATS Narratives | AATS answer keys | Tax periods | AATS scenario known issues and solutions |
|---|---|---|---|---|
| Criteria-based AATS scenarios instructions PDF | N/A: Criteria-based scenarios do not have answer keys since the transmitter has more flexibility in the data that is submitted. Please refer to Publication 5164 for more details. | 2016 | Update: 1/19/2017 |
Tax year 2015 ACA AATS was open for testing in early November 2015 for information returns that were processed in 2016.
IRS opened AATS in November using a character-by-character comparison tool, however testing has migrated to a more robust environment in January that include business rules validations. Special instructions are included in the ReadMe files providing an explanation of the AATS functionality now available. Please review the appropriate ReadMe file before programming the AATS scenarios. Links for the ReadMe files can be found in the comments section below.
AATS scenarios
| AATS scenario forms | AATS answer keys | Tax periods | AATS scenario known issues and solutions | Comments |
|---|---|---|---|---|
| 2015 | Known issues PDF | ReadMe PDF |