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Check the operational status for the Modernized e-File (MeF) production and assurance testing systems.
Production System
Operational
Limited services: Sundays 12 a.m. – 9 a.m. ET
MeF accepts submissions but doesn’t generate acknowledgements or process state services during routine maintenance.
Assurance Testing System (ATS)
Operational
Service unavailable: September 28, 2026, 9 a.m – October 13, 2026, 9 a.m.
MeF ATS will be unavailable beginning Monday, September 28, 2026, 9:00AM Eastern time until Tuesday, October 13, 2026, 9:00AM Eastern time.
The ATS environment will be available for Tax Year 2026 testing starting on Tuesday, October 13, 2026, 9:01 a.m. Eastern time.
Limited services: Sundays 12 a.m. – 9 a.m. ET
MeF accepts submissions but doesn’t generate acknowledgements or process state services during routine maintenance.