Michigan Cannabis Tax Faces Supreme Court Battle as West Michigan Roads Depend on Uncertain Revenue

A state Supreme Court showdown is looming over a 24 percent wholesale tax on marijuana that could determine whether Michigan fixes its roads or not. The legal battle has direct implications for West Michigan communities that rely on state infrastructure projects.

The Michigan Department of Treasury issued updated guidance on the cannabis tax on April 13, just days before the first tax payments are due on April 20. The deadline creates immediate pressure on cannabis operators across the state, from Traverse City to Grand Rapids, to comply with the new tax structure even as its legality hangs in the balance.

$420 million at stake for roads

Under the state's Comprehensive Road Funding Tax Act, the 24 percent wholesale cannabis tax is projected to generate approximately $420 million annually. Much of that funding flows into the neighborhood road fund, which repairs and maintains local streets across West Michigan.

That expectation is why the legal case is moving fast. If the tax is struck down, a significant hole could open in the state budget. Planned road and infrastructure projects could be disrupted. Lawmakers may be forced to find replacement funding quickly.

This is no longer just a cannabis issue. It is a core infrastructure funding question.

Construction industry wants certainty

Michigan's construction sector is watching closely and pushing for a quick resolution. Contractors and infrastructure planners rely on predictable funding streams. Uncertainty around a projected $420 million revenue source creates real operational challenges.

Project timelines face disruption. Hiring decisions become difficult. Capital investments get delayed.

The longer the legal fight drags on, the more ripple effects spread across the broader economy.

April 20 deadline creates immediate pressure

The April 20 payment deadline is the first real test of the new tax. Operators must calculate taxable wholesale transactions since January 1. They must apply the full 24 percent tax. They must remit payment to the state.

All of this happens while operators know the tax itself may not survive the court challenge.

Failing to comply now could trigger penalties. Even if the tax is later overturned.

Why the Supreme Court is moving fast

The case has been positioned for direct review by the Michigan Supreme Court to avoid a prolonged legal battle.

At stake is a major state revenue stream. The financial stability of cannabis operators. The integrity of Michigan's voter-approved marijuana framework.

The fast-track approach reflects how disruptive a delayed ruling could be.

Guidance clarifies the rules for now

Even as the legal fight unfolds, Treasury is enforcing the tax as written.

No double taxation but timing matters. Cannabis first sold to a retailer before January 1, 2026 is not subject to the tax, even if resold later. Mixed inventory is fully taxed if sold after January 1. Wholesalers are responsible for paying and remitting the tax.

The tax base includes fees and shipping. Only the first retail transfer is taxed. Earlier supply chain transactions are not taxed.

Industry caught between compliance and uncertainty

Cannabis operators now face a high-stakes balancing act. Write checks by April 20 while the legality of the tax is still in question.

That creates immediate pressure on cash flow. Pricing strategies. Contract negotiations.

Two very different outcomes

If the tax is upheld, it becomes a permanent cost structure. Margins compress further. Consolidation accelerates.

If the tax is overturned, it leaves a major gap in road funding. Lawmakers must act quickly. Refunds or financial adjustments could trigger.

The bottom line

Michigan's cannabis industry is now operating at the intersection of a 24 percent wholesale tax. An April 20 payment deadline. A fast-tracked Supreme Court decision. And $420 million in annual road funding at risk.

This is bigger than cannabis. It is a state budget and infrastructure story unfolding in real time. The outcome will shape both Michigan's roads and its regulated cannabis market.

Industry argues tax structure is unconstitutional

The Michigan Cannabis Industry Association filed a second lawsuit challenging the state's 24 percent wholesale tax on marijuana. The group argues the levy drives up costs that are ultimately passed on to consumers.

"This new lawsuit exposes how the 24 percent wholesale tax imposed by the state is unconstitutional," said Rose Tantraphol, spokesperson for the association.

The association contends the tax creates a practice known as tax pyramiding. The added wholesale cost becomes part of the base used to calculate Michigan's existing sales tax. That inflated base pushes the effective tax rate consumers pay beyond the 6 percent rate the state constitution permits.

Cannabis products on display inside a dispensary in Traverse City, Michigan, September 28, 2025. (Spectrum News/Jack Caron)

Effective sales tax rate exceeds legal cap

Tantraphol said the state's labeling of the tax does not change what it actually does to consumers.

"So basically what you have here is a state of Michigan calling this a 24 percent wholesale tax, but effectively this 24 percent tax is acting as a sales tax," Tantraphol said. "It's effectively acting as an additional sales tax on consumers. Cannabis customers are paying an effective sales tax rate that is higher than the legal 6 percent sales tax rate."

First lawsuit heads to trial

The association informed Spectrum News that their first lawsuit against the wholesale tax is now headed to trial. That legal challenge questioned whether the Legislature followed the proper constitutional process to pass the tax.

Industry profitability under pressure

Gretchen Whitmer signed a bipartisan road funding deal in October 2025 that included the 24 percent wholesale cannabis tax. The tax is not assessed on profit. It is assessed on wholesale price.

When an ounce of recreational flower sells for as little as $60, operators are paying taxes before they know if they will break even. Stack that on top of the existing 10 percent retail excise tax and 6 percent sales tax, and Michigan cannabis is now one of the most heavily taxed consumer goods in the state by a wide margin.

Industry spokesperson calls road funding plan unsustainable

An industry spokesperson said it would be a mistake for the state to continue to count on revenue from the wholesale tax on marijuana for road revenue.

"There's nothing sustainable about the road funding plan," said Rose Tantraphol, spokesperson for the Michigan Cannabis Industry Association. "It was established through an unconstitutional process and sets up a tax structure that is illegal. The road funding compromise singled out the cannabis industry and has already triggered business closures and job losses. Undercutting one industry isn't going to raise the revenue that the state hopes to raise."

Sources

• https://mitechnews.com/news/michigan-clarifies-24-cannabis-wholesale-tax-rules-as-supreme-court-showdown-looms-and-april-20-payment-deadline-hits/
• https://spectrumlocalnews.com/mi/michigan/news/2026/04/07/cannabis-michigan-lawsuit
• https://www.wemu.org/michigan-news/2026-04-09/whitmer-kicks-off-her-final-road-repair-season