On October 7, 2025, Michigan Governor Gretchen Whitmer signed into law the Comprehensive Road Funding Tax Act (House Bill 4951), which will impose a 24% excise tax on wholesale marijuana transactions beginning January 1, 2026. This new tax is in addition to the existing 10% excise tax and 6% sales tax on retail marijuana sales, marking a significant additional obstacle to positive margins in Michigan’s cannabis regulatory landscape.
