St. Charles County Property Tax Appeal — Missouri

Rob Hartley·Updated February 16, 2026

St. Charles County, Missouri collects the highest property tax in Missouri, levying an average of $2,377.00 (1.20% of median home value) yearly in property taxes. The county has a median home value of $293,699 and a median effective property tax rate of 1.08%, slightly higher than the national median of 1.02%, with a median annual tax bill of $3,174, which is $774 higher than the national median property tax bill of $2,400. Each property owner in St. Charles County is subject to no fewer than six taxing jurisdictions (state, county, school, fire, ambulance, library), and often more, depending on where you live.

Notable cities: St. Charles, O'Fallon, St. Peters, Lake St. Louis, Wentzville

Median Home

$293,699

Tax Rate

1.08%

Annual Tax

$3,174

Population

approximately 405,000

2026 Appeal Deadline: second Monday in July of 2026

Appeal forms must be received no later than 5 p.m. on second Monday in July of 2026

Property in St. Charles County, Missouri — local tax assessment and appeal guide

How St. Charles County Assesses Property

19%of market value

Assessed by: St. Charles County Assessor's Office

Assessment cycle: biennial (every odd-numbered year)

Notices typically mailed: end of January

In St. Charles County, the market value of your property is multiplied by the statutory level of assessment. Residential property is assessed at 19% of market value, agricultural at 12%, and commercial and all other at 32%. For example, if your home's market value is $293,699 (the county median), at Missouri's 19% assessment ratio your assessed value would be $55,803, resulting in approximately $3,174 in annual taxes at the county's median effective rate of 1.08%.

The Appeal Process

Appeals are heard by the Board of Equalization. A hearing will be scheduled where the board will hear evidence from the assessor and any evidence you might have regarding the value of the property

Step 1: Contact the county assessor's office as soon as you are notified of your assessment for an informal meeting

Step 2: If not satisfied after the informal meeting, contact your county clerk for information regarding forms and deadlines for appealing to the county Board of Equalization

Step 3: File your appeal form with the Board of Equalization by 5 p.m. on the second Monday in July 2026

Step 4: Attend the Board of Equalization hearing where the board will hear evidence from both the assessor and property owner

Step 5: If still not satisfied, appeal to the Missouri State Tax Commission by September 30 or 30 days from the date of the BOE decision, whichever is later

Required form: property tax appeal form

Filing Methods

mail:Mail appeal form to St. Charles County Assessor, 201 N. Second St., St. Charles, MO 63301

in-person:Submit at 201 N. Second St., St. Charles, MO 63301

Evidence to Bring

photographsrecent sale of your propertyoral testimony of someone who has done a recent appraisalprevious appraisalsappraisals for similar properties

St. Charles County Assessor Contact

St. Charles County Assessor's Office

Phone: ((636) 949-7425

Address: 201 N. Second St., St. Charles, MO 63301

Website: https://www.sccmo.org/151/Assessor

Online Portal: https://mo-stcharles-assessor.publicaccessnow.com/

Hours: Monday - Friday 8 a.m. - 5 p.m.

Tax Exemptions in St. Charles County

Missouri Property Tax Credit

maximum of $750 for renters and $1,100 for owners who owned and occupied their home

The Missouri Property Tax Credit Claim gives credit to certain senior citizens and 100 percent disabled individuals for a portion of the real estate taxes or rent they have paid for the year

Eligibility: Senior citizens (65+) and 100% disabled individualsDeadline: April 15

Senior Property Tax Relief Program

Varies based on income

St. Charles County administers the Senior Property Tax Relief Program, which opens to new applicants each spring

Eligibility: Qualifying seniors must be at least 62 years old and must live at the property they're applying for as of Jan. 1, 2026Deadline: March 1-June 30, 2026

Disabled Prisoner of War Exemption

Varies

Disabled Prisoner of War Exemption for qualifying veterans

Eligibility: Disabled prisoners of warDeadline: Contact Assessor's Office

Official Resources

St. Charles County Assessor Website →

Official county assessor site with property search tools, assessment information, and appeal process details

Missouri State Tax Commission →

State-level appeals information and forms for property tax appeals beyond the county Board of Equalization

St. Charles County Collector of Revenue →

Pay property taxes online, view tax bills, and access information about tax relief programs

St. Charles County Property Database Search →

Search for property information, assessments, and comparable sales data for your appeal

St. Charles County Appeal Statistics

% Who Appeal

25%

Check Your St. Charles County Assessment

Enter your address to see if your St. Charles County property is overassessed.

✓ All 50 states✓ Instant results✓ $49 flat fee

Frequently Asked Questions

What is the deadline to appeal my property taxes in St. Charles County?

The deadline to appeal your property taxes in St. Charles County is 5 p.m. on the second Monday in July of 2026. This is a strict deadline for filing with the Board of Equalization. If you're not satisfied with the BOE decision, you have until September 30, or 30 days from the date of the BOE decision, whichever is later, to appeal to the Missouri State Tax Commission. Missing these deadlines means you'll have to wait until the next assessment cycle to appeal your property valuation.

How do I file a property tax appeal in St. Charles County online?

Currently, St. Charles County does not offer online filing for property tax appeals. To appeal your property tax, you must call the St. Charles County Assessor's Office at(636) 949-7425 and ask for a property tax appeal form. You can submit the completed form by mail to 201 N. Second St., St. Charles, MO 63301, or deliver it in person to the same address. The county does offer an online check-in system if you need to visit in person, allowing you to view wait times and get in line before you arrive.

What happens at a Board of Equalization hearing in St. Charles County?

At a Board of Equalization hearing in St. Charles County, the board will hear evidence from both the assessor and any evidence you might have regarding the value of the property which is the subject of the appeal. You should come prepared with documentation supporting your proposed valuation, such as recent appraisals, photos of property condition issues, or comparable sales data. Remember that stating property taxes are too high is not relevant testimony - you must focus on establishing the correct market value of your property. The board will review all evidence and make a decision about your property's assessed value.

How much can I save by appealing my property taxes in St. Charles County?

Statistics show that about 25% of homes in America are unfairly overassessed, and pay an average of $1,346 too much in property taxes every year. With St. Charles County's median annual tax bill of $3,174, a successful appeal could potentially save you hundreds or even thousands of dollars annually. If your appeal is successful, your property will be reassessed at a lower valuation and your St. Charles County property taxes will be lowered accordingly. The exact savings depend on how much your property was overassessed and the strength of your supporting evidence.

What evidence do I need for a St. Charles County property tax appeal?

Evidence for a St. Charles County property tax appeal could include photographs, the recent sale of your property, or the oral testimony of someone who has done a recent appraisal of your property. Previous appraisals, expert opinions, and appraisals for similar properties may be attached to the appeal as supporting documentation. For commercial properties, a professional appraisal is expected. Focus on presenting evidence that establishes your property's true market value as of January 1 of the tax year, including any factors that might negatively impact value such as needed repairs or unfavorable location characteristics.

What is the Senior Property Tax Relief Program in St. Charles County?

St. Charles County administers the Senior Property Tax Relief Program, which opens to new applicants each spring. Qualifying seniors must be at least 62 years old and must live at the property they're applying for as of Jan. 1, 2026. The application period for the 2026 tax year is March 1-June 30, 2026. Documentation must be submitted that shows proof of identity and age, with government-issued IDs that show the applicant's date of birth preferred. The program provides tax relief based on income levels, helping eligible seniors reduce their property tax burden.

How are property taxes calculated in St. Charles County?

In St. Charles County, the market value of your property is multiplied by the statutory level of assessment - residential property is assessed at 19% of market value, agricultural at 12%, and commercial and all other at 32%. This assessed value is then multiplied by the tax rate (per $100) for your particular area. With the county's median home value of $293,699, a typical residential property would have an assessed value of $55,803 (19% of market value). Each property is subject to no fewer than six taxing jurisdictions, with each setting their own rates that combine to create your total tax bill.

Can I appeal my St. Charles County property taxes if I recently purchased my home?

For properties purchased after the second Monday in June, the deadline for filing an appeal with the Missouri State Tax Commission is December 31, giving recent buyers more time to appeal. The recent sale of your property can be used as evidence in your appeal, as it represents current market value. However, keep in mind that the assessor likely already considered recent sales data when determining your assessment. You'll need to demonstrate why your purchase price should be considered the true market value if it differs significantly from the assessed value, and provide additional supporting documentation for your appeal.

For state-wide appeal information including Missouri's assessment ratio and deadlines, see our Missouri Property Tax Appeal Guide →

Considering professional help with your appeal? Compare pricing, coverage, and pros/cons in our Best Property Tax Appeal Services (2026) or browse side-by-side service comparisons →

More Missouri Counties

Jackson County (Kansas City)St. Louis County (Clayton)

← All Missouri property tax appeal info

Sources: https://www.sccmo.org/181/Appeal-Process | https://www.tax-rates.org/missouri/st._charles_county_property_tax | https://www.sccmo.org/151/Assessor | https://www.ownwell.com/trends/missouri/st.-charles-county | https://stc.mo.gov/frequently-asked-questions/ | https://www.sccmo.org/2343/Seniors-Real-Estate-Property-Tax-Relief-

Last verified: 2026-02-16