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Software Developer Website for Substitute Forms and Electronic Filing

Michigan Treasury Updates 

Treasury is no longer accepting Letters of Intent (Form 4430). A revised version of Form 4430 will be posted in August 2024 for Tax Year 2024.

NOTE: If your business/organization supports ONLY Personal Property Tax forms, you do NOT need to submit Form 4430. The most recent version of the Personal Property Tax forms are on Treasury’s Web site.

Once your company’s 4430 is processed, your company will receive an e-mail from Support@taxadmin.org  which will provide you access to the approved folder(s) with the State Exchange System site.

Michigan Department of Treasury will post all e-file and form information to the State Exchange Site. 

Software developers should reference the Substitute Forms Submissions Manual for guidelines on submitting substitute forms. Software developers are not to submit forms for testing until forms are posted as “Final Drafts.” 

Contact Information

E-mail: MIFormsEfile@michigan.gov