Software Developers

Software Developers - Modernized e-File 2018

  • Letter of Intent
    • If you plan to participate in modernized electronic filing for the Ohio Form MNP10, please forward your Letter of Intent to  Vendor testing with ODT will be enabled soon after IRS makes ATS available.
  • 2018 MeF Schemas (made available upon approval)
  • Ohio ATS Tests TY 2018 (made available upon approval)
  • MeF Error Codes (made available upon approval)
  • 2018 Tax Rates
  • Foreign Country Codes
  • 2018 MNP10 MeF Approval Status (Coming soon)


  • 2018 Software Developer's Booklet (Coming soon)
  • 2018 Ohio Practitioner's Electronic Filing Booklet (Coming soon)