St Charles, MO Sales Tax Rate: 7.95%

Other rate areas in St Charles

The Missouri Department of Revenue lists these further combinations for St Charles. Which one applies depends on the exact address.

St Charles County

Outside the city limits, the St Charles County rate of 5.95% applies. Other cities in St Charles County: Augusta (7.45%), Cottleville (7.95%), Dardenne Prairie (8.45%), Defiance (5.95%), Flint Hill (6.95%), Foristell (7.95%), Fort Zumwalt (5.95%), Harvester (5.95%), Josephville (6.95%), Lake St Louis (7.95%), Matson (5.95%), New Melle (7.95%), O'fallon (7.95%), Orchard Farm (5.95%), Peruque (5.95%), Portage Des Sioux (6.95%), St Paul (5.95%), St Peters (7.95%), Weldon Spring (7.45%), Weldon Springs Heights (5.95%), Wentzville (8.45%), West Alton (6.95%).

Methodology

How the combined rate is built

A sales tax rate is a sum. The state sets one rate for every sale in the state; the county, the city and any special district (transit authority, hospital district, improvement district) the address sits in each add their own. The combined rate is those components added together, and the page lists every one with the authority that levies it and the date it took effect, so the total can be checked line by line.

Combined rate  =  state rate + county rate + city rate + district rates
Tax            =  purchase amount × combined rate ÷ 100

Source and effective date

Every rate on this page comes from the Missouri Department of Revenue, Sales/Use Tax Rate Tables, the file dated October 1, 2026 with rates effective October 1, 2026, read on October 8, 2026. The file states one effective date for the whole table and none per jurisdiction, so every component is dated by it. Sales tax rates are not tax-year figures: they change on the first day of a quarter, most often January, April, July and October 1. The snapshot behind these pages is rebuilt from the DOR file on the fifth of those months.

• MoDOR lists one combined sales rate per jurisdiction code. The county line is the county's rate less the state's 4.225% (it includes county-wide districts such as ambulance and fire districts); the city line is the city's rate less its county's.
• Cities whose MoDOR rate is lower than their county row's (1) sit outside a county-wide district; their local rate is shown as one combined line rather than split.
• The state rate of 4.225% is the general rate (3% general revenue, 1% education, 0.125% conservation, 0.1% parks and soils). Food is taxed at a reduced state rate.

Limitations

• General merchandise only. Groceries, prepared food, lodging, motor vehicles, fuel, alcohol and services are taxed at different rates or not at all, and that differs by state and within St Charles, MO.
• A ZIP code is not a jurisdiction. ZIP codes cross county, city and district lines, so a receipt's ZIP does not set the rate; the taxing jurisdictions the address sits in do. That is why there are no ZIP pages here.
• Where the rate is measured. Missouri is an origin-based state: for sales inside the state, the rate at the seller's location applies, not the buyer's.
• Special districts that cover part of a jurisdiction (an address-range improvement district, a transit area that stops at a road) are listed under "other rate areas" where the DOR lists them and left out where it lists them only by address.
• Caps and thresholds (a surtax that applies only to the first $5,000 of an item, a maximum tax per sale) are not modeled; the split assumes the full rate on the full amount.

Last reviewed: October 2026. The state table was checked against each revenue department's page on October 8, 2026; the local snapshots are refreshed from the DOR files every quarter and checked by scripts/check-sales-tax.mjs before each deploy.