When California voters approved Proposition 64 in 2016, the campaign promised reasonable taxation that would keep legal cannabis competitive with the illicit market. A decade later, combined state and local tax rates in some California jurisdictions exceed 40% of the retail price — and the illicit market controls an estimated 60% of all cannabis sales in the state.

California is not unique. Across the country, cannabis tax policy — in every state where cannabis is legal — has become a case study in how well-intentioned revenue goals can undermine the very markets they are supposed to regulate. The phenomenon is called tax stacking — the layering of multiple tax types at different governmental levels that compounds into a total burden far exceeding what consumers see at the register.

How Cannabis Tax Stacking Works

Most consumer products face a single sales tax. Cannabis faces three to four layers of taxation in most legal states, each applied at a different point and calculated on a different base:

Cultivation or weight-based tax: Levied per ounce or per pound at the cultivation or wholesale level. California’s cultivation tax was $161 per pound of flower before it was repealed in 2022 after years of industry pressure. Illinois applies a 7% wholesale tax at the cultivator level.

State excise tax: A percentage-based tax applied at the retail level, specific to cannabis. This is the most visible tax and ranges from 10% (Colorado) to 25% (Washington). Some states set the rate based on THC content — Illinois charges 10% for products under 35% THC, 20% for infused products, and 25% for products over 35% THC.

Local excise tax: Cities and counties in many states can add their own cannabis-specific tax on top of the state rate. In California, local taxes range from 0% to 15% depending on jurisdiction. In Oregon, local option taxes add up to 3%.

General sales tax: The standard state and local sales tax that applies to all retail purchases. This adds 6% to 10% depending on the state, applied on top of all cannabis-specific taxes.

The cumulative effect is dramatic. Use the interactive calculator below to see exactly what you pay in your state.

The Worst Offenders

California remains the poster child for cannabis over-taxation, even after repealing its cultivation tax in 2022. A $50 pre-tax eighth in San Francisco faces a 15% state excise tax ($7.50), a 5% local excise tax ($2.50), and 8.625% sales tax ($5.18), bringing the total to $65.18 — a 30.4% effective tax rate. In some Los Angeles jurisdictions, the total effective rate exceeds 40%.

Illinois applies the highest cannabis-specific tax rates in the country through its THC-tiered system. High-potency concentrates face a 25% state excise tax plus a 7% wholesale tax, plus local taxes up to 3.75%, plus standard sales tax of 6.25% to 10.25% depending on jurisdiction. Effective rates on concentrates in Chicago can approach 45%.

Washington levies a flat 37% excise tax on retail cannabis sales — the highest single-rate excise tax in the country — plus standard sales tax that varies by county. The combined rate in Seattle is approximately 47%.

The States Getting It Right

Oregon applies a 17% state tax with a 3% local option maximum and exempts cannabis from general sales tax (Oregon has no sales tax). The effective rate of 17% to 20% is the lowest in the country and is frequently cited as a model by tax policy researchers.

Colorado charges a 15% state excise tax plus standard sales tax, with no additional local cannabis-specific taxes in most jurisdictions. The effective rate of approximately 23% to 25% represents a workable middle ground.

Michigan applies a 10% excise tax plus 6% sales tax, for a total effective rate of approximately 16% — among the lowest in the country and a key factor in Michigan’s rapid price declines and market growth.

The Illicit Market Connection

The relationship between tax rates and illicit market persistence is not theoretical. It is measurable.

States with total effective cannabis tax rates above 30% consistently show higher illicit market share than states below 25%. California’s legal market captures approximately 40% of total cannabis sales. Oregon’s captures approximately 70%. The correlation is not perfect — enforcement intensity, licensing accessibility, and market maturity all play roles — but taxation is the single factor most within policymakers’ control.

The basic math is simple. If a legal eighth costs $55 after taxes and an illicit eighth costs $30, price-sensitive consumers — which is most consumers — will choose the cheaper option. No amount of public education about testing, safety, or supporting legal businesses changes this calculation when the price differential is 40% or more.

Tax Reform Momentum

Several states have recognized the problem and taken action. California repealed its cultivation tax in 2022. Connecticut reduced its cannabis tax rate in 2025. New York launched with a relatively moderate 13% excise tax structure, having learned from other states’ mistakes.

The most interesting reform proposals are coming from industry groups pushing for tax parity with alcohol. The argument is straightforward: if a six-pack of craft beer faces a combined tax rate of approximately 10% to 15%, there is no policy rationale for taxing an equivalently priced cannabis product at 35% to 45%.

This argument is gaining traction in state legislatures — alongside parallel efforts to resolve the industry’s banking and financial services crisis — particularly as the revenue projections that justified high tax rates have consistently fallen short. States set cannabis tax rates based on projected market sizes that assumed rapid transition from illicit to legal purchasing. When that transition stalled — in large part because of the very tax rates being set — revenue fell short of projections, undermining the political case for maintaining high rates.

What Consumers Should Know

The single most actionable insight from the data is this: the amount you pay in cannabis taxes is primarily determined by where you live, not what you buy. A consumer in Oregon pays less in total taxes on a $40 purchase than a consumer in Illinois pays on a $30 purchase — a disparity that is clearly visible in our cannabis price index.

For consumers in high-tax states, the practical implications include shopping in jurisdictions with lower local taxes when possible, purchasing in larger quantities to reduce per-gram costs, and paying attention to the pre-tax versus post-tax price when comparing dispensary menus — some dispensaries display post-tax prices, others do not.

The interactive tool below lets you calculate your exact tax burden for any purchase amount in any legal state. The numbers might surprise you.