St. Louis County personal property tax: what you owe and how to fight it

Last updated 2026-07-09

What is personal property tax in St. Louis County and who has to pay it?

Personal property tax in Missouri is an annual tax on the movable stuff you own on January 1 of each year. St. Louis County is one of the biggest collectors of this tax in the state, covering roughly 1 million residents across about 90 municipalities. ^[1]

Own taxable property in the county on January 1? You owe the tax for that whole year, even if you move to Texas in February. That catch trips up a lot of people.

Here is what gets assessed:

• Passenger vehicles, trucks, motorcycles, and RVs
• Boats and boat motors
• Aircraft
• Trailers and mobile homes not permanently attached to land
• Business furniture, fixtures, and equipment
• Farm machinery and livestock (taxed at a lower rate)
• Manufactured homes titled as personal property

Real estate, meaning your house and the land under it, is assessed separately under a different schedule and is not covered here. This article is about the annual personal property tax that shows up because you own a car or a boat, not because you own a building.

Missouri law authorizing the tax lives at RSMo Chapter 137. ^[2] St. Louis County runs it through the County Assessor's office in Clayton.

How does St. Louis County calculate your personal property tax assessment?

Missouri's constitution sets the assessment ratio for most personal property at 33.33% of true (market) value. ^[2] So a car worth $30,000 on the open market gets an assessed value of $10,000. The county then applies the local tax rate to that assessed value.

The St. Louis County Assessor uses the NADA Official Used Car Guide (now J.D. Power) to value vehicles, pulling the trade-in figure as of January 1 each year. Trade-in runs lower than retail, which is good for you. But it still climbs when used-car prices spike, and that is exactly what happened from 2021 through 2024 when chip shortages pushed used values to record highs. ^[3]

What you actually pay depends on where you live inside the county. The county sets a base rate. Then municipalities, school districts, library districts, and fire districts each stack their own levies on top. The combined rate swings a lot from one address to the next.

Here is the math with a real example:

Step	Example
Vehicle market value (NADA trade-in)	$30,000
Assessment ratio (33.33%)	$10,000 assessed value
Combined local tax rate (example: $7.00 per $100 of assessed value)	$700
Personal property tax bill	$700

Rates across the county usually run between $5 and $9 per $100 of assessed value depending on your location. The Assessor's office publishes a levy chart each year showing the rate for every taxing district. ^[1]

Business personal property follows the same 33.33% ratio, but the valuation works differently. Business owners report equipment and furniture at cost, and the assessor runs a depreciation table to reach market value. Some gear depreciates fast. Heavy machinery, though, often holds value longer in the assessor's tables than it does in the real world, and that gap is one of the most common reasons businesses file appeals.

What are the personal property tax rates in St. Louis County for 2024 and 2025?

There is no single blanket rate. St. Louis County contains dozens of overlapping taxing jurisdictions, so your rate is the sum of the county general fund levy, your school district levy, your municipality levy, your library district levy, and any special districts (fire, ambulance, road). ^[1]

The Missouri State Tax Commission runs an annual study of assessed values and levy rates across every county. That study puts the median personal property levy in St. Louis County for recent years in the range of roughly $6.50 to $8.00 per $100 of assessed value. Your specific address sets your actual number. ^[4]

To find your exact rate, the St. Louis County Collector of Revenue publishes a levy sheet tied to each account every tax year. Look up your account on the county website using your account number or address.

One practical note. Missouri Senate Bill 190, passed in 2023, created a property tax credit tied to inflation for seniors, but that credit applies to real estate only. Through the 2025 tax year it does nothing for your car tax. Personal property relief for vehicles keeps coming up in Jefferson City, with proposals to cap year-over-year increases, but no statewide cap was in effect as of mid-2025. Check the Missouri General Assembly website for the current status. ^[5]

When is the St. Louis County personal property tax declaration due?

Every St. Louis County resident who owned taxable personal property on January 1 must file a declaration by March 1 of that year. ^[1]

Miss March 1 and the county tacks on a late-filing penalty. Missouri statute RSMo 137.280 lets assessors add up to $100 for late filers, and St. Louis County enforces it. ^[2] Filing late does not get you out of the tax. It just costs you more.

New to Missouri or to St. Louis County? You still have to file your first declaration even if no form showed up in the mail. The county mails pre-printed forms to prior-year filers automatically, but new residents have to request one or file online. Never getting a form is not a legal excuse for missing the deadline.

The county now takes online declarations through its assessment portal. You log in, review the pre-loaded vehicle list (pulled from state title records), add anything missing, drop vehicles you no longer own, and submit. Save your confirmation number.

Here are the dates that matter:

Date	What happens
January 1	Assessment date: what you own today sets your tax
March 1	Personal property declaration deadline
Late June / early July	Assessment notices mailed
Third Monday in July	Board of Equalization appeal deadline (varies by year)
November 1 (approx.)	Tax bills mailed by Collector of Revenue
December 31	Tax payment deadline
January 1 (following year)	Interest begins on unpaid balances (2% per month under RSMo 140.100)

How do you appeal your St. Louis County personal property tax assessment?

You get two levels of appeal. The first one is free and faster than most people expect.

Step 1: Informal review with the Assessor

After your assessment notice lands (usually late June or early July), call or visit the St. Louis County Assessor's office and ask for an informal review. Bring documentation: a printout of your vehicle's NADA trade-in value as of January 1 of the tax year, repair bills showing condition problems, or a recent appraisal. Staff can correct clerical errors or adjust the value on the spot if your paperwork is solid. No formal filing. No cost.

Step 2: St. Louis County Board of Equalization

If the informal review does not fix it, file a formal appeal with the St. Louis County Board of Equalization (BOE). The deadline is the third Monday in July, tied to that year's assessment notice. ^[1] Missing this deadline is the single most common mistake taxpayers make, and there is essentially no exception.

The BOE hearing is an administrative proceeding. You show up (or in many cases submit your evidence in writing), present your valuation proof, and the board issues a written decision. No attorney required. For a vehicle, your best evidence is the NADA trade-in value printed straight from the NADA website for January 1 of the tax year, plus documentation of any major mechanical issues, high mileage, or accident history (a Carfax or AutoCheck report works well).

Step 3: Missouri State Tax Commission

Still unhappy after the BOE? Appeal to the Missouri State Tax Commission (STC). You have 30 days from the date the BOE decision is mailed to you. ^[4] STC proceedings are more formal, run through a hearing officer, and follow rules of evidence. Most personal property appeals never need to go this far, but the door is there.

For business personal property with real money at stake, the STC route earns its trouble. For a single vehicle overvalued by a few hundred dollars, the BOE is usually where you stop.

Want to handle the appeal yourself instead of handing a contingency firm a cut? A structured approach matters. TaxFightBack's DIY appeal kit walks through exactly what evidence to gather and how to present it to the BOE, so every dollar of savings stays with you.

One thing worth knowing. A successful appeal cuts your assessed value for that tax year only. If the problem sticks around, you re-file the next year, because Missouri reassesses personal property annually.

What evidence actually wins a personal property tax appeal in St. Louis County?

The evidence standard at the BOE is simpler than most people think. The assessor used NADA trade-in to set your value. Your job is to show that number is wrong for your specific vehicle as of January 1 of the tax year.

The strongest evidence packages include:

NADA trade-in value as of January 1. Go to nada.com or jdpower.com, enter your vehicle's exact year, make, model, mileage, and trim, and pull the trade-in value. Set the date as close to January 1 of the relevant year as the tool allows. Print it or save a PDF. The assessor uses NADA, so presenting the same source with better inputs (accurate mileage, correct trim) is hard to argue against.

Vehicle condition documentation. Above-average mileage, a salvage title, accident history, or documented mechanical problems all pull trade-in value below the standard NADA estimate. A Carfax or AutoCheck report showing accident records is objective third-party evidence the board takes seriously.

Independent appraisal. For high-value vehicles, collector cars, or any case where the NADA number seems structurally wrong, a written appraisal from a licensed dealer or certified appraiser carries weight. An appraisal runs about $100 to $300. Worth it if the tax savings clear that hurdle.

Market comparables. For unusual vehicles or equipment that NADA covers poorly, print 3 to 5 current actual sale listings from reputable sources. Make sure they reflect sales, not asking prices.

Business personal property calls for a different approach. Present your own depreciation schedule showing current market value, an independent equipment appraisal, or evidence that the assessor's depreciation table does not match real resale values for your asset class. Trade publications, dealer quotes, and published auction results all count.

The Missouri State Tax Commission spells out the standard: the taxpayer must show "by substantial and persuasive evidence" that the assessed value is wrong. ^[4] That standard applies at the BOE level too. Bring more documentation than you think you need.

Are there any exemptions from St. Louis County personal property tax?

A handful of property categories are fully or partly exempt under RSMo Chapter 137. ^[2]

Nonprofit and religious organizations. Property owned by qualifying religious, educational, or charitable groups and used for exempt purposes is generally not taxed. The exemption takes a formal application with the assessor.

Government property. Property owned by federal, state, or local government is exempt.

Inventory held for sale. Goods a business holds for resale are generally exempt under Missouri law. Equipment you use to run the business is taxable. The goods you sell are not.

Farm animals and farm machinery. Missouri taxes farm equipment and livestock at a reduced assessment ratio of 12% of true value instead of the standard 33.33%, under RSMo 137.115. ^[2] If you run a licensed agricultural operation, confirm the assessor has your property coded correctly.

Vehicles owned by disabled veterans. Missouri exempts one vehicle owned by a 100% service-connected disabled veteran. The application goes through the assessor's office and needs documentation from the VA.

There is no general homestead exemption for personal property in Missouri the way some states shield a slice of a primary residence's belongings. Missouri's personal property exemptions are narrower than several neighboring states'.

For seniors, Missouri's property tax credit (the "circuit breaker" under RSMo 135.010) covers real property taxes on a primary residence only, not personal property. The confusion comes because both bills arrive from the same county. The circuit breaker will not touch your car tax. ^[6]

How does St. Louis County personal property tax compare to nearby counties?

Every Missouri county uses the same 33.33% assessment ratio for most personal property, so the methodology is identical statewide. What differs is the local levy stacked on top of assessed value.

St. Louis City is a separate jurisdiction from St. Louis County, running itself as both a city and a county. It has its own assessor, BOE, and levy rates, so city residents often pay a different total than county residents on the same vehicle.

Jefferson County, directly south, uses the same state rules. If you live near the county line, your bill may differ because of local school and fire district levies, not the state framework. See our guide on jefferson county property tax for how its appeal process compares.

Clay County, up in the Kansas City metro, comes up alongside St. Louis County because both are large suburban counties with heavy personal property tax rolls. Clay also uses the 33.33% ratio and NADA values, and its BOE process mirrors St. Louis County's. The levy rates differ because Kansas City area school districts are funded differently.

The table below shows approximate total personal property tax bills for a $30,000 vehicle across several Missouri counties, using the $10,000 assessed value (33.33%) and each county's approximate average levy. These are estimates from published levy data, and your result will vary.

County	Approx. combined levy (per $100 AV)	Tax on $10,000 AV
St. Louis County	~$7.00 to $8.00	~$700 to $800
St. Louis City	~$6.00 to $7.00	~$600 to $700
Jefferson County	~$5.50 to $6.50	~$550 to $650
Clay County	~$6.00 to $7.50	~$600 to $750
Jackson County	~$5.50 to $7.00	~$550 to $700

Note: These ranges reflect recent levy data from the Missouri State Tax Commission's annual report and are approximate. Your exact rate depends on your taxing district within each county. ^[4]

What happens if you don't pay St. Louis County personal property tax on time?

The payment deadline is December 31. Miss it and interest starts at 2% per month, which is 24% a year, under RSMo 140.100. ^[2] That is not a typo. Missouri's delinquent tax rate is steep next to most states.

A small late fee also applies. The extra cost stacks up fast if you let a balance sit into spring.

Here is the part that catches most people. Missouri law requires proof of prior-year personal property tax payment before you can renew your vehicle plates with the Department of Revenue. ^[7] The Department calls it the "paid personal property tax receipt" requirement. Skip your St. Louis County tax and the DMV will not renew your tags. There is no wage garnishment on this tax, so the plate renewal is the chokepoint that gets you.

If you genuinely cannot pay by December 31, call the St. Louis County Collector of Revenue before the deadline. The county has a payment plan for hardship cases, though interest keeps accruing on installment balances.

Let delinquent taxes run for years and the property can eventually face a tax sale. For personal property that is rarer than for real estate, but the mechanism exists. Old unpaid balances land you on the county's delinquent tax list, which is public record. Getting current before any sale action starts always costs less than cleaning up after.

How do I look up my St. Louis County personal property tax account online?

Two county portals matter for personal property tax.

First, the St. Louis County Assessor's website (assessor.stlouisco.com) lets you look up your assessment account. You can see the vehicles and other assets on file, the assessed values assigned, and your account number. Start here if you think something is wrong with your assessment.

Second, the St. Louis County Collector of Revenue website (revenue.stlouisco.com) lets you look up your tax bill, see payment history, and pay online. You need your account number or your name and address. The Collector's site also flags any delinquent balances from prior years. ^[8]

Think a vehicle on your account was sold, stolen, or otherwise gone before January 1 of the tax year? Contact the Assessor's office. You will need proof, usually a bill of sale or the title transfer paperwork, to get it removed. Do not assume a DMV title transfer reaches the assessor automatically. In practice it often lags.

Business personal property uses the same Assessor portal. Businesses can also ask for a review of their depreciation schedule or equipment list by contacting the commercial division directly.

Need to handle a prior tax year (say you just found an old unpaid balance)? The Collector's office takes back-year payments. The Assessor handles assessment corrections for prior years through the STC process if the BOE window has already closed.

Can you get a tax waiver if you're new to Missouri or St. Louis County?

Yes. New Missouri residents who did not own taxable personal property in Missouri on January 1 of the prior year qualify for a "statement of non-assessment" (people call it a waiver) from the St. Louis County Assessor. ^[1]

The waiver matters because the Missouri DMV wants either proof of prior-year personal property tax payment or a waiver before it will issue plates on your newly registered vehicle. Without one or the other, you are stuck at the counter.

To get it, visit the Assessor's office in Clayton or request it through the county portal. You will need proof you were not a Missouri resident on January 1 of the prior year. A prior state's driver's license, a lease or utility bill showing your old address, or military orders all work.

The waiver covers your first year only. Starting the next January 1, you are a Missouri resident for personal property tax purposes and owe the tax normally. File your declaration by March 1 of your first full year.

What do Missouri law and state rules say about assessment uniformity?

Missouri's Constitution, Article X, Section 4, requires that personal property be assessed uniformly within each class. ^[9] So if the county uses NADA trade-in to value everyone's similar vehicles, it has to apply that standard the same way for everyone. Show that a neighbor's identical vehicle got assessed materially lower than yours, and you have a uniformity argument at the BOE or STC.

In practice, uniformity appeals show up more for real estate (where parcel-by-parcel comparison is easy) than for personal property (where a table-driven system should apply uniformly by design). But they do come up for business personal property, where subjective depreciation calls can produce different results across similar businesses.

The Missouri State Tax Commission publishes an annual assessment ratio study. The STC standard is that assessed values should land within 10% of the established ratio (33.33%). Find a county running systematically above or below that ratio, and the STC can order an across-the-board adjustment. The STC puts the standard plainly: the taxpayer must show an overassessment "by substantial and persuasive evidence." ^[4]

For most residents appealing a single vehicle, uniformity matters less than the plain market-value argument. Get the NADA printout, document your vehicle's condition, present it clearly. That wins more often than a constitutional argument about uniformity.

How does the St. Louis County personal property tax appeal process compare to real estate appeals?

The mechanics rhyme, but the evidence differs, and the dollars usually argue for putting more effort into real estate appeals.

Real estate in St. Louis County gets reassessed on a two-year cycle (residential in odd-numbered years). The BOE process leans on comparable sales, and the values at stake can run into hundreds of thousands of dollars. Real estate appeals across major counties show meaningful overturn rates when backed by good comparable sales data. See our breakdowns of cook property tax and fairfax county property tax for how those bigger markets run their appeals.

Personal property is different. It is reassessed annually, the per-item values are usually lower, and the evidence is simpler (NADA printout instead of comparable sales). But because it happens every single year, an overvaluation you ignore costs you money every year. Getting year one right pays off.

Another practical split. Real estate assessments run through the Residential or Commercial division and involve physical inspections. Personal property is table-driven (NADA values applied uniformly) with no inspection, so errors usually come down to wrong vehicle specs on file (wrong trim, wrong mileage) or cases where the real market diverged sharply from the guide.

Appealed a real estate assessment in another state and found it doable? Personal property in St. Louis County is easier. No touring comps, no pulling recorder data. A printed NADA page and a Carfax report is a complete evidence package for most vehicle appeals.

Frequently asked questions

What is the deadline to appeal my St. Louis County personal property tax assessment?

The deadline to file with the St. Louis County Board of Equalization is the third Monday in July of the tax year. Your assessment notice arrives in late June or early July, and that notice starts the appeal window. Miss the BOE deadline and you can still appeal to the Missouri State Tax Commission, but the STC process is more formal, and the BOE window is where most taxpayers should act.

How does St. Louis County determine the value of my car for personal property tax?

The St. Louis County Assessor uses the NADA Official Used Car Guide (now published by J.D. Power). The assessor pulls the trade-in value as of January 1 of the tax year based on your vehicle's year, make, model, and trim, then applies mileage adjustments. If the county has the wrong trim level or mileage on file, or your vehicle has documented condition issues, you can dispute the value at the Board of Equalization.

When is St. Louis County personal property tax due?

St. Louis County personal property tax bills are mailed in early November and are due December 31. After December 31, interest accrues at 2% per month under Missouri law. Unpaid personal property taxes also block your Missouri vehicle plate renewal, because the DMV requires a paid personal property tax receipt before processing renewals.

Do I need to file a personal property declaration every year in St. Louis County?

Yes. Missouri requires an annual declaration by March 1. St. Louis County mails pre-filled forms to prior-year filers in January. You review the pre-loaded vehicle list, make changes (add new vehicles, drop sold ones), and submit by March 1. The county now accepts online filing. Missing the deadline adds a late-filing penalty of up to $100 under RSMo 137.280.

How do I get a personal property tax waiver in St. Louis County as a new resident?

New Missouri residents who owned no taxable personal property in Missouri on January 1 of the prior year can request a statement of non-assessment (waiver) from the St. Louis County Assessor. You show proof of your prior address (out-of-state license, lease, or utility bills). The waiver satisfies the Missouri DMV requirement for prior-year personal property tax payment and lets you register your vehicle and get plates.

What personal property is exempt from St. Louis County personal property tax?

Property owned and used by qualifying religious, educational, or charitable organizations is exempt. Business inventory held for resale is exempt. Farm machinery and livestock get a reduced 12% assessment ratio instead of 33.33%. One vehicle owned by a 100% service-connected disabled veteran is exempt. The Missouri senior circuit breaker credit does not apply to personal property taxes, only to real estate taxes on a primary residence.

Can I appeal my business personal property tax assessment in St. Louis County?

Yes. Business owners can appeal assessed values for furniture, fixtures, equipment, and other business personal property through the same BOE process that covers vehicles. The strongest evidence is your own depreciation schedule showing current fair market value, an independent equipment appraisal, or published equipment auction results showing what similar assets sell for. The county's depreciation tables sometimes lag real market depreciation, especially for technology gear.

What is the personal property tax rate in St. Louis County?

There is no single rate. Your rate sums levies from the county, your school district, your municipality, your library district, and any special districts. Combined rates across the county typically run between roughly $6.50 and $8.00 per $100 of assessed value in recent years, but your exact rate depends on your address. Look it up on the St. Louis County Collector of Revenue website using your account number.

How is St. Louis County personal property tax different from real estate property tax?

Personal property tax hits movable assets you own on January 1: vehicles, boats, business equipment. Real estate tax hits land and permanently attached structures. The same Assessor's office handles both, but on different schedules. Personal property is assessed annually. Residential real estate is reassessed every two years in odd-numbered years. Both bills come from the same Collector's office with the same December 31 due date.

Does selling a car mid-year reduce my St. Louis County personal property tax for that year?

No. Missouri's personal property tax is based on what you own on January 1. Own the car on January 1 and you owe the full year's tax even if you sell it in February. Flip side: buy a car in March and it is not taxable until the following January 1 assessment date. This surprises people who sell a vehicle and still get a tax bill for it.

How does the St. Louis County personal property tax compare to Clay County personal property tax?

Both counties use Missouri's standard 33.33% assessment ratio and NADA trade-in values, so the methodology is identical. The difference is local levy rates. Clay County (Kansas City metro) and St. Louis County both carry overlapping school, fire, and municipal levies that land in roughly similar ranges, but specific amounts vary by taxing district. Both run a BOE appeal process with a summer filing deadline.

What happens if the St. Louis County Assessor has my car listed at the wrong trim level?

This is one of the most common and easiest errors to fix. If your notice shows a higher trim than you own (say it lists an "EX" when you have an "LX"), the NADA value comes out inflated. Bring your vehicle title, window sticker, or registration showing the correct trim to the Assessor's office or the BOE hearing. The assessor can fix clerical errors informally, or you present it at your hearing and win the adjustment.

Can I appeal to the Missouri State Tax Commission if I lose at the St. Louis County Board of Equalization?

Yes. After an unfavorable BOE decision, you have 30 days from the date it is mailed to file with the Missouri State Tax Commission. STC proceedings are more formal, run through assigned hearing officers, and follow rules of evidence. For most single-vehicle appeals, the extra time and paperwork may not be worth it unless the dollar amount at stake is real.

Do I need an attorney or tax agent to appeal my St. Louis County personal property tax?

No. The BOE process is built for individual taxpayers without lawyers. You show up, present your evidence (NADA printout, Carfax, condition documentation), and the board decides. Many people wrap it up in under 30 minutes. Attorneys and contingency firms take a cut of any reduction they win. Handle it yourself and keep the full savings. The TaxFightBack DIY appeal kit gives you structured evidence templates for exactly this.

Sources

1. Missouri Revised Statutes, Chapter 137 (Property Tax): Missouri assesses most personal property at 33.33% of true value; late filing penalty up to $100; delinquent interest 2% per month; farm machinery taxed at 12%
2. Missouri State Tax Commission, Assessment Practices Survey: STC oversees assessment uniformity and annual levy data; taxpayer bears burden of proof by substantial and persuasive evidence
3. Missouri State Tax Commission, Annual Report and Assessment Ratio Study: Missouri counties' combined personal property tax levy rates and STC appeal process; 30-day window to appeal after BOE decision
4. Missouri General Assembly, Senate Bill 190 (2023): SB 190 (2023) created property tax credit for seniors tied to inflation on real property only, not personal property
5. Missouri Department of Revenue, Property Tax Credit (Circuit Breaker): Missouri circuit breaker credit applies to real estate taxes on a primary residence, not personal property taxes
6. Missouri Department of Revenue, Motor Vehicle Licensing: Missouri requires paid personal property tax receipt or waiver before vehicle license plate renewal
7. St. Louis County Collector of Revenue: Personal property tax bills mailed November, due December 31; payment and delinquency lookup available online
8. Missouri Constitution, Article X, Section 4: Missouri Constitution requires uniform assessment of personal property within each class
9. NADA Guides (J.D. Power), Used Car Values: NADA trade-in value is the primary source St. Louis County Assessor uses to value vehicles for personal property tax
10. Missouri Revised Statutes, RSMo 140.100 (Interest on delinquent taxes): Delinquent Missouri personal property taxes accrue interest at 2% per month
11. Missouri Revised Statutes, RSMo 137.280 (Late filing penalty): Assessors may add penalty up to $100 for late personal property declaration filers