No Columbus Day Downtime for Modernized e-File
Responding to concerns, the IRS will keep Modernized e-File in operation over the Columbus Day weekend. However, other services will be brought down for maintenance.
From approximately 3:00 a.m. EST, Sunday, October 11 until 4:00 p.m. EST, Monday, October 12,* the documents stored on the e-services secure mailbox operations will be inaccessible. Tax preparers will still be able to access the Transcript Delivery System, TIN Matching, and e-File application services.
Source: Internal Revenue Service
* The IRS notes that maintenance issues may cause the above times to change.