The Tax Year 2021 Form 8849 Modernized e-File (MeF) Assurance Testing System (ATS) information is contained below. If you support these Forms, you will need to contact the e-Help Desk for testing. Please monitor this page for any ATS Scenario updates. TY 2021 Form 8849 MeF ATS Scenarios: 8849 MeF ATS Scenario 1PDF 8849 MeF ATS Scenario 2PDF 8849 MeF ATS Scenario 3PDF 8849 MeF ATS Scenario 4PDF 8849 MeF ATS Scenario 5PDF 8849 MeF ATS Scenario 6PDF For information and questions regarding ATS, please contact the e-help Desk at 1-866-255-0654. Modernized e-File (MeF) Assurance Testing System (ATS) Updates Page
