The Comprehensive Road Funding Tax Act establishes a framework for the imposition and collection of excise taxes on marihuana sales in Michigan, effective January 1, 2026. The act levies a 24% excise tax on the wholesale price of marihuana during various transactions, including sales from marihuana establishments to retail licensees and from provisioning centers to retail licensees. The Department of Treasury is tasked with administering these taxes, including the creation of necessary forms and rules for compliance. Additionally, the act creates the Comprehensive Road Funding Fund, which will receive a portion of the tax revenue to support road funding initiatives.

Revenue generated from the excise tax will be allocated to the Comprehensive Road Funding Fund and the Neighborhood Road Fund, with specific amounts designated for each fund in the first fiscal year and subsequent adjustments for inflation in later years. The act also outlines the responsibilities of the state treasurer in managing the fund and ensures that any unspent funds at the end of the fiscal year remain available for future use. The act will only take effect if certain related bills are also enacted into law.