Software Developers

Software Developers - Modernized e-File 2017

  • Letter of Intent (made available upon request)
    • If you plan to participate in modernized electronic filing for the IT-1041, please forward your request to  We will then provide you with the Letter of Intent.  ATS testing begins December 5, 2017.
  • 2017 MeF Schemas (made available upon approval)
  • Ohio ATS Tests TY 2017 (made available upon approval)
  • MeF Error Codes (made available upon approval)
  • 2017 Tax Rates
  • Foreign Country Codes
  • 2017 IT 1041 MeF Approval Status


  • 2017 Software Developer's Booklet (Coming soon)
  • 2017 Ohio Practitioner's Electronic Filing Booklet (Coming soon)

Tax Forms and Publications