The Tax Year 2021 1120 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 1120 MeF ATS Scenarios 1120 MeF ATS Scenario 1 (Form 1120)PDF (10/27/2021) 1120 MeF ATS Alt Scenario 1 (Form 1120)PDF (10/27/2021) 1120 MeF ATS Scenario 2 (Form 1120)PDF (10/27/2021) 1120 MeF ATS Scenario 3 (Form 1120)PDF (10/27/2021) 1120 MeF ATS Scenario 4 (Form 1120)PDF (10/27/2021) 1120S MeF ATS Scenario 5 (Form 1120S)PDF (10/27/2021) 1120S MeF ATS Scenario 6 (Form 1120S)PDF (10/27/2021) 1120S MeF ATS Scenario 7 (Form 1120S)PDF (10/27/2021) 1120S MeF ATS Scenario 8 (Form 1120S)PDF (10/27/2021) 1120F MeF ATS Scenario 9 (Form 1120F)PDF (10/27/2021) 1120S MeF ATS Scenario 10 (Form 1120S)PDF For information and questions regarding ATS, please contact the e-Help Desk at 866-255-0654. Modernized e-File (MeF) Assurance Testing System (ATS) Updates Page Tax Year 2021 1120 MeF Schemas and Business Rules Page
