Benefits of 1040 Modernized e-File Frequently asked questions for 1040 Modernized e-File (MeF) Modernized e-File (MeF) Assurance Testing System (ATS) updates 1040 Modernized e-File (MeF) information for transmitters and States Contact the MeF mailbox for questions or comments about the 1040 MeF Program. Modernized e-File (MeF) Program information
