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https://www.irs.gov/e-file-providers/modernized-e-file-mef-status-page
1040 MeF Production Shutdown/Cutover Schedule

Shutdown begins on Saturday, November 17, 2018, at 11:59 p.m. in order to prepare the system for the upcoming Tax Year 2018 Filing Season.

Shutdown Deadlines on Saturday, November 17, 2018 Transmitters:

Transmitting Submissions (State & Federal) 10:00 p.m. Retrieving Acknowledgements 11:59 p.m.

States:

Transmitting Acknowledgements 11:30 p.m.

Business MeF Production Shutdown/Cutover Schedule

Shutdown for "Send Submissions" only is scheduled to begin at 11:59 a.m., Tuesday, December 26, 2017, to prepare the system for the upcoming 2018 Filing Season.
 
Transmitters can continue to use the other service requests except “Send Submissions” until 11:59 p.m., Tuesday, December 26, 2017.
 
MeF Assurance Testing System (ATS) Schedule will remain open throughout this production shutdown/cutover period.


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