Modernized e-File (MeF) Operational Status Modernized e-File (MeF) Production Calls When: Wednesday, May 12, 2021 Time: 2:30 p.m. Eastern Call-in Number: 888-331-8226 Access Code 3600320 MeF Production Call Log 05-12-2021 MeF Production Call Log 04-21-2021 MeF Production Call Log 04-01-2021 MeF Production Call Log 03-23-2021 MeF Production Call Log 03-16-2021 MeF Production Call Log 02-17-2021 MeF Production Call Log 02-16-2021 MeF Production Call Log 02-12-2021 Filing Season Start Dates: Business tax returns: January 8, 2021 Individual tax returns: February 12, 2021 Updates: Critical Update for Modernized e-File (MeF) System: The MeF system has tightened cryptographic requirements to conform to government-wide guidance and upgrade from digests using the SHA-1 algorithm in digital and XML signatures. As a result, MeF Production and Assurance Testing System (ATS) environments no longer accept signature and digest methods using SHA-1. An error will be generated if SHA-1 is used, therefore you must switch to SHA-256 or higher. Those with RSA certificates may use SHA-384 or SHA-512. The most common signature method can be found at XML Signature WG and the most common body part digest can be found at XML Encryption Syntax and Processing. For more information about detailed method URIs for the newer digests please review information found at XML Security Algorithm Cross-Reference. Note: When clicking on the links above you will leave IRS.gov and be directed to another site. Schemas and Business Rules: Beginning September 2016 Software Developers and state organizations started receiving the schemas and business rules through their e-Services mailbox rather than downloading them from the IRS website. In order to access these files you must have an active e-Services account and be listed on an e-File application with the provider option of Software Developer or state. Your role must be Responsible Official, or Delegated User with MeF authorities. These mailbox messages are purged after 30 days so please make sure to download them as soon as possible. Instructions for accessing the SOR Mailbox were created for your use. You may access the login page, register for e-services, reset your password, and make changes to your existing account on e-Services Online Tools for Tax Professionals. Refer to Modernized e File MeF Schemas and Business Rules for additional details on versions and dates for each form family. (Updated 3/15/2017) Distribution of Modernized e-File (MeF) New Web Service Definition Language (WSDLs): (Updated 07/22/2021) WSDLs for Tax Year 2021 / Processing Year 2022 (WSDL version R10.5) are available now. The new WSDLs are scheduled to be installed in the MeF Assurance Testing System (ATS) environment in early Fall of 2021. They will be required for MeF Production for Processing Year 2022. To request a copy of the latest WSDLs please send a request to MeF mailbox at firstname.lastname@example.org with your company name and ETIN. As a reminder you should be using the "la.alt" (la.alt.www4) for ATS and "la" main" URL (la.www4) for Production environments.