The tables below provide links to the Tax Year 2019 Release Memorandum, XML Schemas, and Business Rules for the MeF 1040 Series and Extensions. Throughout the year, multiple versions of Business Rules and Schemas may be in use at the same time. For each version, the tables below reflect the effective dates in the Assurance Testing System (ATS) and Production System. Tax Year 2019 Documents Tax Year 2019 Form 1040 Series Forms and Attachments List XLSX Tax Year 2019 Accepted Forms and Schedules for Individual Tax Returns and Extensions XLSX Tax Year 2019 Recommended Names for Portable Document Files (PDFs) Attached to 1040 MeF Submissions XLSX Tax Year 2019 Known Issues and Solutions XLSX Tax Year 2019 Form 1040 Series Version Date Available ATS Date Production Date Comments 2019v5.5 10/12/2021 10/12/2021 01/24/2022 10/12/2021: 1040 Series Schema Only 2019v5.4 11/23/2020 12/13/2020 01/14/2021 2019v5.3 10/17/2020 11/22/2020 01/14/2021 10/17/2020: 1040 Series Schema Only. 2019v5.2 06/02/2020 06/15/2020 08/17/2020 06/02/2020: updated Schema and Business rule Packages to add the 1040X. 2019v5.1 02/12/2020 03/08/2020 03/22/2020 04/14/2020: 1040, 1040NR, and 1040SS(PR) Business Rule Change Pages only were made available on 04/13/2020. 2019v5.0 11/26/2019 12/29/2019 01/27/2020 03/09/2020: 1040 and 1040NR Business Rule Change Pages only were made available on 03/07/2020. 01/09/2020: 1040, 1040NR, and 1040SS(PR) Business Rule Change Pages only were made available on 01/08/2020. 2019v4.0 10/15/2019 12/08/2019 Not Valid in Production 2019v3.0 09/03/2019 11/04/2019 Not Valid in Production 2019v2.0 07/23/2019 Not Valid in ATS Not Valid in Production 2019v1.0 06/11/2019 Not Valid in ATS Not Valid in Production Tax Year 2019 Form 4868 Version Date Available ATS Date Production Date Comments 2019v2.0 07/23/2019 11/04/2019 01/27/2020 2019v1.0 06/11/2019 Not Valid in ATS Not Valid in Production Tax Year 2019 Form 2350 Version Date Available ATS Date Production Date Comments 2019v2.0 07/23/2019 11/04/2019 01/27/2020 2019v1.0 06/11/2019 Not Valid in ATS Not Valid in Production Form 9465 Version Date Available ATS Date Production Date Comments CUv21.0 07/23/2019 11/04/2019 01/27/2020 Form 56 Version Date Available ATS Date Production Date Comments CUv19.0 11/26/2019 12/29/2019 01/27/2020 CUv18.0 10/15/2019 12/08/2019 Not Valid in Production CUv17.0 07/23/2019 11/04/2019 Not Valid in Production