Software Developer Information and Specifications

Specifications are provided for developers of software for electronically filing tax returns. This information is for:

  • Commercial software vendors to create software for approval by the Department.
  • Companies to develop in-house software applications for direct electronic filing of their tax returns.

What's New

  • Effective January 1, 2018, the state sales tax rate on the lease or rental of commercial real property will decrease from 6% to 5.8%. (Local option discretionary sales surtax continues to apply.) Specifications are provided below.
  • Corporate income tax 2017 specifications are now available.
  • Reemployment tax corrected reports (RT-8A) can now be uploaded using SecureNet. Developer testing continues to be available. Specifications are provided below.
  • Insurance premium tax specifications are now available.
  • All specifications include updated documentation and instructions.

All software developers must complete a Software Development Application (Form DR-600001 PDF Icon).

For information about developing filing software, contact the Business Technology Office at If you are an authorized vendor, please include your software ID.

Communications Services Tax

Corporate Income Tax

Insurance Premium Tax

Motor Fuel Tax

  • Motor and Other Fuel Taxes EDI Technical Implementation Guide (Form DR-309650 PDF Icon) - Includes requirements for creating return files, user instructions and procedures for filing both a test and a production return.

Test scripts are for taxpayers who have only filed zero returns or reports and software developers who would like to test their system. Details may be found in the Guide.

Exceptions code lists are for use in conjunction with submission manifests.

Reemployment Tax

Sales and Use Tax, Solid Waste Surcharge and/or E911 Fee