| Subject: Update - Annual System Update for the Modernized e-File (MeF) Assurance Testing System (ATS)
Updated Schedule: ATS Cutover October 3, 2025 – October 14, 2025 MeF ATS will be unavailable beginning Friday, October 3, 2025, 5:00 p.m. Eastern time until Tuesday, October 14, 2025, 9:00 a.m. Eastern time. The ATS environment will be available for Tax Year 2025 testing starting on Tuesday, October 14, 2025, 9:01 a.m. Eastern time. Please refrain from accessing the testing system during this maintenance window. Please monitor the MeF Operational Status page for any future updates. Important Notes • New R10.9 WSDLs (Web Service Definition Language) will be installed in ATS. Software developers will need to use the new WSDLs to connect to MeF A2A (Application to Application) services. A QuickAlerts bulletin was issued on August 15, 2025, with details on the WSDLs.
• Use "la.alt" URL (la.alt.www4) for the ATS environment, and use "la" main URL (la.www4) for the Production environment.
• A new version of the A2A Toolkit will be released prior to the ATS startup. This release contains updated WSDLs and is a mandatory upgrade for all ATS users. All A2A Toolkit users will be notified by email with instructions on how to download and install the new version. We apologize for any inconvenience this may cause. Back to Top
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