The Tax Year 2018 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 2018 1120 MeF ATS Scenarios 1120 MeF ATS Scenario 1 PDF (Form 1120) - 11/01/2018 1120 MeF ATS Alt Scenario 1 PDF (Form 1120) - 11/01/2018 1120 MeF ATS Scenario 2 PDF (Form 1120) - 12/13/2018 1120 MeF ATS Scenario 3 PDF (Form 1120) - 11/01/2018 * 1120 MeF ATS Scenario 4 PDF (Form 1120) - 11/01/2018 * 1120S MeF ATS Scenario 5 PDF (Form 1120S) - 12/13/2018 1120S MeF ATS Scenario 6 PDF (Form 1120S) - 12/13/2018 1120S MeF ATS Scenario 7 PDF (Form 1120S) - 12/13/2018 1120S MeF ATS Scenario 8 PDF (Form 1120S) - 09/28/2018 1120F MeF ATS Scenario 9 PDF (Form 1120F) * - 12/07/2018 TY2018 1120 MeF ATS Scenarios - ATS Scenarios if supporting Forms 965, Form 965-B and F965 schedules 1120 MeF ATS Scenario 10 PDF (Form 1120) - 12/12/2018 1120 MeF ATS Scenario 11 PDF (Form 1120) - 12/07/2018 * For information and questions regarding ATS, please contact the e-Help Desk at 1-866-255-0654. *Available for ATS testing on 12/9/18 Modernized e-File (MeF) Assurance Testing System (ATS) Updates PageTax Year 2018 1120 MeF Schemas and Business Rules Page