All services except “Send Submissions” will be unavailable for the Internal Revenue Service’s Modernized e-File production and testing systems on Sunday, March 19, from 12:01 a.m. until 10 a.m. Eastern.
More information is on the MeF Operational Status page, including any future updates.
The system conducts a routine system maintenance build every Sunday at about this time. During this maintenance period, MeF will accept submissions but will not generate acknowledgements or process any state services such as Get Submissions, Send Acknowledgements or Send Receipts.
The IRS noted, however, that the MeF Assurance Testing System will be operational during the cutover.
MeF provides electronic filing and payment options for filers of corporation, employment tax, estates and trusts, excise tax, exempt organization, individual, and partnership tax returns.