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 MNPTax@tax.state.oh.us.  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)

Booklets

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