IRS issues several notifications to the transmitter during the various stages of Modernized e-File (MeF) processing.  If a taxpayer uses a third party transmitter to send their electronic return to IRS, they should check with their transmitter for specific information.  

1. When the transmission to IRS is successful, the IRS immediately notifies the transmitter that the transmission was received and the return is ready to begin processing.
2. Once the transmission file is received, the MeF system validates the transmission file and creates an acknowledgement file within 24 hours.
   1. If the electronic return passed MeF validation the acknowledgment file is generated. 
   2. If the electronic return failed MeF validation the acknowledgement file contains:

      Error Category - Errors are grouped into a small number of categories

      Error Message - Rule text or XML validator message

      Rule Number - Each rule is identified by a unique rule number

      Severity - 'Reject And Stop' or 'Reject'

      Data value - Data value causing the violation - when appropriate