Emergency-related state tax relief available for taxpayers located in twelve northern Michigan counties impacted by March 2025 storms.
E35. Is developer testing required if I am a large taxpayer that develops proprietary software to prepare and e-file my MBT return?
E35. Is developer testing required if I am a large taxpayer that develops proprietary software to prepare and e-file my MBT return?
Yes. Please see publications 4672, Michigan Business Tax Fed/State e-file Specifications, and Software Developer Guide and 4673, Michigan Business Tax (MBT) MeF Test Package for Software Developers, located on the software developer secure Web site for more information.
For access to the secure Web site, review Policy ET-03066 Substitute Printed, Computer-Generated, Electronic Filing, and 2-D Barcode Forms/Software and follow the instructions for requesting a username and password. New usernames and passwords are assigned each year for access to the secure Web site.