IRS News: Modernized e-File (MeF) Extended Maintenance Window

MeF Production and Assurance Testing System (ATS) environments will be unavailable due to maintenance from 12:01 a.m. through 1:00 p.m. Eastern time on Sunday, March 21, 2021. Please refrain from accessing the MeF Systems during this maintenance. Please monitor the MeF Operational Status page  for any future updates. We apologize for any inconvenience this may cause.