Scheduled Modernized e-File (MeF) Production and Assurance Testing System (ATS) Extended Labor Day Downtime

The MeF system will be down from 3:00 pm, Eastern on Friday, August 31st until 12:00 pm, Eastern on Tuesday, September 4th (Labor Day weekend).  The extended outage is due to installation of a new power grid as well as routine operation and maintenance programs.
The Modernized e-File systems (both Production and ATS) will not be operational during this timeframe. Please refrain from accessing the MeF Production or Assurance Testing Systems to transmit business/individual/State tax returns, retrieve acknowledgements or submit any other service requests.

Read More at IRS.gov