The Tax Year 2023 Form 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 2023 1120 MeF ATS scenarios 1120 MeF ATS scenario 1 (Form 1120) PDF (12/01/2023) 1120 MeF ATS Alt scenario 1 (Form 1120) PDF (12/01/2023) 1120 MeF ATS scenario 2 (Form 1120) PDF (10/17/2023) 1120 MeF ATS scenario 3 (Form 1120) PDF (10/17/2023) 1120 MeF ATS scenario 4 (Form 1120) PDF (10/17/2023) 1120-S MeF ATS scenario 5 (Form 1120-S) PDF (10/17/2023) 1120-S MeF ATS scenario 6 (Form 1120-S) PDF (10/23/2023) 1120-S MeF ATS scenario 7 (Form 1120-S) PDF (10/23/2023) 1120-S MeF ATS scenario 8 (Form 1120-S) PDF (10/23/2023) 1120-F MeF ATS scenario 9 (Form 1120-F) PDF (10/17/2023) 1120-S MeF ATS scenario 10 (Form 1120-S) PDF (05/29/2024) 1120 MeF ATS scenario 11 (Form 1120) PDF (06/03/2024) 1120 MeF ATS scenario 12 (Form 1120 PDF) (08/20/2024) For information and questions regarding ATS, please contact the e-Help Desk at 866-255-0654. Modernized e-File (MeF) Assurance Testing System (ATS) Tax year 2023 1120 MeF schemas and business rules
