St. Louis County voters will decide Proposition U on the August 4 primary ballot. The measure would authorize a countywide local use tax on certain out-of-state purchases where local sales tax is not already collected. Supporters say it would help address a projected budget shortfall and create a level playing field for local businesses, while opponents argue it amounts to a tax increase and believe the county should focus on controlling spending before seeking additional revenue.
St. Louis County voters weigh local use tax proposal
ST. LOUIS COUNTY, MO – August 3, 2026 (STL.News) St. Louis County voters will decide the fate of Proposition U during Missouri’s August 4, 2026, primary election, one of the most closely watched local ballot measures this year. If approved by a simple majority, the proposal would authorize the county to impose a local use tax at the same rate as its existing local sales tax on qualifying purchases from out-of-state sellers when local sales tax has not already been collected.
County leaders say the measure would modernize the local tax structure and generate millions of dollars to support county services. Critics counter that it represents another tax increase for consumers and argue the county should first address spending and budget priorities before asking voters for additional revenue.
What would Proposition U do?
Despite being described by some as an “online sales tax,” Proposition U is more accurately described as a local use tax.
Under Missouri law, a use tax generally applies when taxable goods are purchased from an out-of-state retailer and local sales tax has not already been collected. Many large online retailers already collect Missouri sales and use taxes under existing law, so the proposal would primarily affect transactions where the applicable local use tax is not currently being collected.
The ballot language asks voters whether St. Louis County should:
“Impose a local use tax at the same rate as the total local sales tax rate, provided that if the local sales tax rate is reduced or raised by voter approval, the local use tax rate shall also be reduced or raised by the same action.”
If approved, the tax would take effect in January 2027.
Why county officials support the measure
County Executive Sam Page and several organizations, including the Municipal League of Metro St. Louis and the St. Louis REALTORS®, have publicly supported Proposition U. They argue the proposal is intended to modernize tax collection rather than create a fundamentally new tax structure.
Supporters cite several reasons for voting “Yes.”
First, they argue the measure promotes fairness between brick-and-mortar retailers and qualifying out-of-state sellers. Local businesses generally collect local sales taxes at the point of sale, while some qualifying remote purchases may not generate the same local tax revenue.
Second, county officials estimate Proposition U would generate approximately $70 million annually, providing a significant new revenue source as the county faces long-term fiscal challenges.
Supporters also argue the additional revenue could help maintain county services without requiring substantial reductions in public safety, parks, public health, and other government operations. They contend the county’s financial outlook has become increasingly challenging as federal pandemic assistance and proceeds from the Rams settlement continue to decline.
Why opponents oppose Proposition U
Opposition to Proposition U centers primarily on taxation and government spending.
Critics argue the proposal represents a tax increase that would ultimately be paid by consumers. They contend that families already face higher costs for housing, groceries, insurance, and other necessities and should not be asked to pay additional taxes.
Some opponents also question whether the projected revenue would solve the county’s underlying fiscal challenges. Under Missouri law, use-tax revenue is distributed among multiple governmental entities rather than remaining entirely with St. Louis County government. As a result, only part of the estimated revenue would directly support county operations.
Others argue county officials should focus first on reducing expenditures, improving operational efficiency, and identifying budget savings before seeking additional tax revenue from voters.
A familiar question for voters
This is not the first time St. Louis County voters have been asked to approve a countywide use tax.
A similar proposal appeared on the ballot in 2022 and was rejected by voters. County officials returned with Proposition U in 2026 after continuing discussions about the county’s long-term financial outlook and projected budget pressures.
Several municipalities within St. Louis County have already adopted local use taxes of their own, meaning many county residents may already pay similar taxes depending on where they live and where purchases are made.
Potential financial impact
Supporters estimate Proposition U could generate approximately $70 million each year, although actual collections would depend on consumer purchasing patterns and the volume of qualifying transactions.
According to county officials, revenue would be distributed in accordance with Missouri law among St. Louis County, municipalities, and other local taxing districts that are eligible to receive a share of the proceeds.
Whether the projected revenue fully addresses future budget challenges remains uncertain. Revenue estimates are forecasts rather than guarantees, and future county spending decisions will continue to be determined through the annual budget process.
What voters should consider
For many voters, Proposition U presents a straightforward policy choice.
Those who support the measure may conclude that updating the local tax system and providing additional revenue for county government outweigh the potential increase in taxes on qualifying purchases.
Those opposed may believe that government should reduce spending before seeking new revenue and that consumers should not face additional taxes during a period of continued economic uncertainty.
Neither position changes the underlying facts.
If voters approve Proposition U, St. Louis County will gain authority to collect a local use tax beginning in January 2027. If voters reject the measure, the county will continue operating under its current tax structure, and county leaders may need to identify other ways to address projected budget shortfalls.
Bottom line
Proposition U is one of the most significant local fiscal questions facing St. Louis County voters this election cycle. The measure is neither a simple “online shopping tax” nor a broad new sales tax on every purchase. Instead, it would authorize a countywide local use tax on qualifying out-of-state purchases where local sales tax is not already collected.
Supporters believe it is a practical way to modernize tax collection, support local businesses, and provide an estimated $70 million annually for local government. Opponents argue it places an additional burden on consumers and maintain that county leaders should prioritize spending reforms before asking voters to approve another tax.
On August 4, voters—not county officials or advocacy groups—will decide whether Proposition U becomes law.
