Tax Year 2023 Form 1040 Modernized e-File (MeF) Assurance Testing System (ATS) information is outlined below. If you support these forms, you will need to contact the e-Help Desk for testing. Please monitor this page for any Tax Year 2023 Form 1040 series and extensions ATS scenario updates. Tax year 2023 Form 1040 series and extensions MeF ATS scenarios 1040 MeF ATS Scenario 1 PDF (Form 1040) – 10/06/2023 1040 MeF ATS Scenario 2 PDF (Form 1040) – 10/06/2023 1040 MeF ATS Scenario 3 PDF (Form 1040) – 10/06/2023 1040 MeF ATS Scenario 4 PDF (Form 1040) – 11/14/2023 Note: Valid in ATS beginning 11/19/2023. 1040 MeF ATS Scenario 5 PDF (Form 1040) – 10/06/2023 1040 MeF ATS Scenario 6 PDF (Form 1040SS) – 12/12/2023 Note: Valid in ATS beginning 12/17/2023 1040 MeF ATS Scenario 7 PDF (Form 1040) – 10/06/2023 1040 MeF ATS Scenario 8 PDF (Form 1040) – 10/06/2023 Note: Valid in ATS beginning 11/19/2023. 1040 MeF ATS Scenario 12 PDF (Form 1040) – 02/14/2024 1040 MeF ATS Scenario 1 PDF (Form 1040NR) – 12/12/2023 Note: Valid in ATS beginning 12/17/2023 1040 MeF ATS Scenario 2 PDF (Form 1040NR) – 12/12/2023 Note: Valid in ATS beginning 12/17/2023 1040 MeF ATS Scenario 3 PDF (Form 1040NR) – 12/12/2023 Note: Valid in ATS beginning 12/17/2023 1040 MeF ATS Scenario 4 PDF (Form 1040NR) – 12/12/2023 Note: Valid in ATS beginning 12/17/2023 1040 MeF ATS Scenario 5 PDF (Form 1040NR) – 12/12/2023 Note: Valid in ATS beginning 12/17/2023 1040 MeF ATS Scenario 1 PDF (Form 1040SR) – 10/06/2023 1040 MeF ATS Scenario 1 PDF (Form 1040SS (sp)) – 12/12/2023 Note: Valid in ATS beginning 12/17/2023 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 2023 Modernized e-File Schemas and Business Rules for Individual Tax Returns and Extensions
