IRS News: Scheduled Maintenance for the Modernized e-File (MeF) Production System
Please be advised that the MeF Production System will be unavailable for business e-File submissions from 7:00 a.m. through 5:00 p.m. Eastern time on Saturday, November 27, 2021.
During this time you can still transmit returns to the Electronic Filing Center (EFC) and we will hold the e-files until the IRS restores service. You will not receive any acks during this time.
For more info, please visit The IRS announcement.