Last verified: March 2026
The Missouri Reversal
For three years, Illinois's southern border was a cash register. Missourians crossed the Mississippi River to buy recreational cannabis from Metro East dispensaries in Collinsville, Sauget, and East St. Louis. Then Missouri legalized recreational cannabis in February 2023 with a total tax rate of approximately 6%.
The effect was immediate and devastating to Illinois border communities:
| Community | Impact |
|---|---|
| Collinsville | Cannabis tax revenue dropped 38% |
| Sauget | Monthly cannabis tax revenue fell from $55,000 to $23,000 |
The math was simple. A consumer buying a $50 eighth of concentrate-level THC products pays approximately $3 in Missouri taxes versus $15–$20 in Illinois taxes. That $12–$17 per-purchase difference adds up to hundreds of dollars per year for regular consumers. Missouri didn't just stop the cross-river traffic — it reversed it. Illinois residents in the Metro East now cross into Missouri for cheaper cannabis.
The Tax Comparison
| State | Approx. Total Tax | Border Dynamics |
|---|---|---|
| Illinois (Chicago) | Up to ~41.25% | Highest in the region; drives border shopping |
| Illinois (downstate) | ~16–31% | Still higher than all neighbors with rec |
| Missouri | ~6% | Reversed IL border traffic since Feb 2023 |
| Michigan | ~16% | Mature market with lower prices draws northern IL |
| Wisconsin | Illegal (rec) | Sends consumers south into IL |
| Indiana | Fully illegal | Sends consumers west into IL |
| Iowa | Medical only (restricted) | Sends consumers east into IL |
Michigan: The Northern Drain
Michigan's mature recreational market with approximately 16% total tax also draws Illinois consumers, particularly from the northern suburbs and the I-94 corridor. Michigan's oversupply crisis crushed wholesale prices, making its retail products significantly cheaper than Illinois equivalents. For Chicago-area consumers willing to make the drive, Michigan offers both lower prices and lower taxes.
The States That Still Send Traffic
Illinois's eastern and northern borders remain profitable. Wisconsin has no recreational cannabis (medical is extremely limited), sending consumers from Milwaukee, Madison, and the entire Wisconsin border south to dispensaries in Winthrop Harbor, Mundelein, and the Chicago suburbs. Indiana maintains full prohibition, making Illinois the closest legal option for consumers in Indianapolis, Gary, and the entire western Indiana corridor. Iowa's medical program is highly restricted, sending Quad Cities area consumers across the river to Illinois dispensaries.
Together, these three illegal/restricted border states represent the remaining source of out-of-state revenue. But the overall trend is clear: out-of-state purchases dropped from 31% of adult-use sales in 2021 to approximately 20% in 2025.
The Policy Dilemma
Illinois faces a structural problem it cannot easily solve. Lowering cannabis taxes to compete with Missouri's 6% rate would sacrifice hundreds of millions in revenue including R3 funding for impacted communities. Maintaining current rates continues the border drain. Every state that legalizes around Illinois reduces the out-of-state consumer pool. If Wisconsin or Indiana legalize, Illinois loses its remaining competitive advantage as a border destination.
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