Affordable Care Act Assurance Testing System (AATS) information returns

 

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 instructionsPDF for tax years 2022 and beyond.

Tax year 2023/Processing year 2024 AATS testing began on November 1, 2023.

AATS scenarios

Tax period AATS known issues and solutions

1094B/1095BZIP

1094C/1095CZIP

2023 Update: TBD
Known issues for scenarios

Tax year 2022/Processing year 2023 AATS testing began on November 1, 2022.

AATS scenarios

Tax period AATS known issues and solutions

1094B/1095BZIP

1094C/1095CZIP

2022 Update: TBD
Known issues for scenarios

Tax year 2021/Processing year 2022 AATS testing began on November 2, 2021.

AATS instructions AATS scenarios Tax period AATS known issues and solutions
 AATS instructionsPDF

1094B/1095BZIP 

1094C/1095CZIP

2021 Update: TBD
Known issues for scenarios

Tax year 2020/Processing year 2021 AATS testing began on November 2, 2020.

AATS scenarios

Tax period AATS known issues and solutions

1094B/1095BZIP

1094C/1095CZIP

2020 Update: TBD
Known issues for scenarios

Tax year 2019/Processing year 2020 AATS testing began on November 1, 2019.

Predefined AATS Scenarios
Instructions Predefined AATS narratives Predefined AATS answer keys Tax periods AATS scenario known issues and solutions
Predefined scenario instructionsPDF

1094B/1095BZIP

1094C/1095CZIP

1094B/1095BZIP

1094C/1095CZIP

2019 Update: 9/28/2020
Known issues for scenariosPDF

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

1094B/1095B PDF

1094C/1095C 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

Known issues for scenariosPDF

Tax year 2018/Processing year 2019 ACA AATS testing began on November 2, 2018.

Predefined AATS scenarios
Instructions Predefined AATS narratives Predefined AATS answer keys Tax periods AATS scenario known issues and solutions
Predefined scenario instructionsPDF 

1094B/1095BZIP

1094C/1095CZIP

1094B/1095BZIP

1094C/1095CZIP

2018

Update: 11/01/2018

Known issues for scenariosPDF

Criteria-based AATS scenarios

Instructions Criteria-based AATS narratives AATS answer keys Tax periods AATS scenario known issues and solutions
Criteria-based AATS scenarios instructionsPDF

1094B/1095BPDF

1094C/1095CPDF

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

Known issues for scenariosPDF

 

Tax year 2017/Processing year 2018 ACA AATS testing began on October 31, 2017. 

Predefined AATS Scenarios
Instructions Predefined AATS narratives Predefined AATS answer keys Tax periods AATS scenario known issues and solutions
Predefined scenario instructionsPDF 

1094B/1095BZIP

1094C/1095CZIP

1094B/1095BZIP

1094C/1095CZIP

2017

Update: 11/01/2018

Known issues for scenariosPDF

Criteria-based AATS scenarios

Instructions Criteria-based AATS narratives AATS answer keys Tax Periods AATS scenario known issues and solutions
Criteria-based AATS Scenarios InstructionsPDF

1094B/1095BPDF

1094C/1095CPDF

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

Known issues for scenariosPDF

Tax year 2016/Processing year 2017 ACA AATS testing was open for testing in early November 2016.

Predefined AATS Scenarios
Instructions Predefined AATS narratives Predefined AATS answer keys Tax periods AATS Scenario known issues and solutions
Predefined scenario instructionsPDF 

1094B/1095BZIP

1094C/1095CZIP

1094B/1095BZIP

1094C/1095CZIP

2016

Update: 01/19/2017

Known issues for scenariosPDF

Criteria-based AATS scenarios

Instructions Criteria-based AATS Narratives AATS answer keys Tax periods AATS scenario known issues and solutions
Criteria-based AATS scenarios instructionsPDF

1094B/1095BPDF

1094C/1095CPDF

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: 01/19/2017

Known issues for scenariosPDF

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

1094B/1095BZIP

1094C/1095CZIP

1094B/1095BZIP

1094C/1095CZIP

2015

Known issuesPDF

ReadMePDF

 

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