Johnson County property tax: rates, assessments, and how to appeal

Last updated 2026-07-09

What is the Johnson County property tax and who controls it?

Johnson County, Kansas sits in the Kansas City metro and is consistently the wealthiest county in the state by median household income. That wealth shows up in home values and, inevitably, in property tax bills. But a lot of homeowners are surprised to find that the county itself does not set your tax rate. It sets your assessed value. The actual levy is a pile of separate rates from your city, your school district, the county general fund, the library, the fire district, and sometimes a special assessment district on top of that.

The Johnson County Appraiser's Office determines the appraised (market) value of every parcel in the county each year ^[1]. Kansas law, specifically K.S.A. 79-1458, requires the county appraiser to appraise real property at its fair market value as of January 1 of each tax year ^[2]. Once the appraiser sets that number, the county applies the statewide residential assessment ratio of 11.5% to get your assessed value. Commercial property is assessed at 25% of appraised value.

From there, your taxing entities each apply their mill levy to that assessed value. One mill equals $1 of tax for every $1,000 of assessed value. The total mill levy in Overland Park, for example, ran around 114 to 120 mills in recent years, depending on your school district, while parts of Olathe or Leawood carry similar or slightly different totals ^[1]. Your total bill is the product of many decisions made by many boards.

The County Treasurer's Office bills and collects taxes. The County Appraiser's Office values property. These are two separate operations, and that distinction matters when you want to fight your bill. You appeal the value, not the levy.

What are the current Johnson County property tax rates?

Mill levies in Johnson County vary by location because your school district alone can shift your total rate by 15 to 20 mills. Here is a snapshot of approximate total mill levies for select cities within the county, based on 2023 levy data published by the county ^[1]. These are combined rates (county general, city, school district, library, fire, and other special levies).

City / Area	Approx. Total Mill Levy (2023)	Effective Rate on Market Value*
Overland Park (USD 512)	~115 mills	~1.32%
Olathe (USD 233)	~112 mills	~1.29%
Lenexa (USD 512)	~113 mills	~1.30%
Leawood (USD 512)	~114 mills	~1.31%
Shawnee (USD 512)	~115 mills	~1.32%
Gardner (USD 231)	~128 mills	~1.47%
Spring Hill (USD 230)	~130 mills	~1.50%

*Effective rate on market value = mill levy × 11.5% (residential assessment ratio) ÷ 1,000.

Those rates sound modest compared to places like Hennepin County, Minnesota or New York City, but on a $450,000 Johnson County home the math adds up fast. At 115 mills: $450,000 × 11.5% = $51,750 assessed value, times 0.115 = $5,951 per year in property taxes. That is a real number. Getting the appraised value wrong by 10% means $595 overpaid every year.

Kansas has no statewide cap on levy increases like California's Prop 13. Levies can and do climb year over year as taxing districts pass new budgets.

How does Johnson County assess your home's value?

The County Appraiser's Office uses mass appraisal, the same approach used in most large counties. Staff appraisers do not walk through every home every year. They build statistical models calibrated to recent sales, then apply those models county-wide ^[1]. The valuation date is January 1 each year. The appraiser is supposed to reflect what your home would have sold for on that date in an arm's-length transaction.

For residential property, the primary method is the sales comparison approach. The appraiser's model looks at sales of comparable homes (similar size, age, condition, neighborhood) that closed in a look-back window, typically the 12 to 24 months before January 1 ^[12]. If the model thinks your house would have sold for $400,000 on January 1, that becomes your appraised value.

The problem with mass appraisal is that the model cannot see everything. It does not know your foundation cracked last summer, that the previous owner converted the basement without a permit, that your kitchen is still the original 1987 laminate while the comp three streets over was fully renovated, or that your lot backs to a busy road the model treats the same as a quiet cul-de-sac lot. Those are exactly the arguments you use in an appeal.

Kansas law requires the appraiser to mail assessment notices to property owners by March 1 of each tax year ^[2]. The notice shows your new appraised value and your prior year value. If the notice never arrives, the law still holds you to the appeal deadline, so check your value online in February at the county's parcel search tool rather than waiting for paper mail.

What exemptions can reduce a Johnson County property tax bill?

Kansas offers several statutory exemptions that directly reduce what you owe. These are not automatic. You have to apply.

Homestead Refund (Low-Income Homestead Refund). The Kansas Department of Revenue runs a refund program for homeowners 55 and older (or surviving spouses of any age) with household income under $40,200. The refund can return up to 75% of the property taxes paid on the first $350,000 of appraised value. You file on Schedule K-40H with your state income tax return or on a standalone claim by April 15 ^[3].

SAFESR (Senior Homeowner Refund). A parallel program is available to claimants 65 and older with income under $20,900. The income threshold is tighter but the refund formula is more generous for qualifying seniors ^[3].

Disabled Veterans Exemption. Kansas exempts $80,000 of appraised value for veterans with a service-connected disability rated at 50% or higher by the VA. The exemption is $80,000, not the whole bill, but on a $450,000 home at 115 mills that translates to roughly $529 per year in tax savings. The application goes to the County Appraiser's Office with a VA letter confirming the disability rating ^[4].

Religious, Charitable, and Educational Exemptions. Nonprofit organizations that own property used exclusively for exempt purposes can apply for exemption through the Board of Tax Appeals in Topeka ^[5]. This is not a homeowner exemption but it matters for any nonprofit that owns Johnson County real estate.

Agricultural Land Classification. Land used for agricultural purposes is assessed at 30% of its use value (not market value), which can run dramatically lower on the rural edges of the county. This applies to genuinely agricultural parcels, not large residential lots ^[2].

If you are comparing exemption programs across states, Johnson County's offerings are thinner than some. Collin County, Texas homesteads, for example, get a $100,000 school district exemption statewide under HB 3, passed in 2023. Kansas has not moved to anything that generous.

What is the Johnson County property tax appeal deadline and process?

This is where most homeowners leave money on the table. The Kansas appeal system has two distinct tracks with different deadlines, and missing the first one does not necessarily mean you are done.

Track 1: Informal Appeal (Appraiser's Office). After you get your assessment notice (mailed by March 1), you have until March 31 to file an informal appeal directly with the Johnson County Appraiser's Office ^[1][2]. This is free, requires no attorney, and is the easiest path by far. You call or go online, state that you disagree with your value, and the appraiser's office schedules a phone or in-person meeting with one of their staff appraisers. You bring your evidence. They look at their data. They either adjust the value or hold it.

Miss March 31, and there is a second window. You can appeal to the Small Claims and Expedited Hearing Division of the Kansas Court of Tax Appeals (COTA) after you receive your tax bill in late November, but before December 20 of that year ^[2]. That route is slightly more formal and requires a filing fee, though small claims hearings are still designed for self-represented taxpayers.

Track 2: COTA Appeal. If the informal appeal does not resolve things, the appraiser's office issues a written decision. From that decision, you have 30 days to file a formal appeal with the Court of Tax Appeals ^[5]. COTA hears property tax appeals statewide and runs both a small claims division (faster, informal, appraised value under $2 million) and a regular division for larger or more complex cases.

Kansas Statute 79-1448 governs the informal appeal right ^[2]. K.S.A. 74-2438 covers COTA jurisdiction and procedure ^[5]. These are public statutes you can read yourself.

The first date is March 31. Mark it now. Everything downstream from an informal appeal is a fallback, not a replacement.

How do you protest property taxes in Johnson County step by step?

Here is what an effective informal appeal actually looks like, in the order you do it.

Step 1: Pull your property record. Go to the Johnson County Appraiser website and search your parcel. Download the property record card. Confirm the data: square footage, bedroom count, bathroom count, year built, basement finish, garage type. Appraisers work from data. If the data is wrong, the value is wrong, and correcting a data error is the single easiest win in any appeal.

Step 2: Find recent comparable sales. You need sales of homes similar to yours that closed in the 12 to 18 months before January 1 of the tax year. The county's own sales search on the appraiser website shows recorded sales. Zillow, Redfin, and public MLS records available through many Kansas real estate agents also help. Look for homes within a half-mile, similar size (within 15% of your square footage), similar age (within 10 years), and similar condition. If those sales suggest your home is worth less than the appraised value, you have a case.

Step 3: Document condition issues. Photos of deferred maintenance, a contractor's estimate for foundation work, a home inspection report, anything that puts a number on a condition the model could not see. A written repair estimate from a licensed contractor carries far more weight than your own description.

Step 4: File your informal appeal. The Johnson County Appraiser's Office accepts informal appeal requests online, by phone, and in person at 11811 S. Sunset Drive, Suite 2100, Olathe, Kansas ^[1]. The form asks you to describe the basis for your disagreement. Keep it simple: "The appraised value of $450,000 exceeds fair market value based on comparable sales and the property's below-average condition."

Step 5: Attend your meeting. Show up (or call in) with your comps printed and your condition photos ready. Let the numbers speak. Staff appraisers often make reasonable adjustments when you have solid sales evidence. If they do not, get the written decision and weigh whether a COTA appeal is worth the extra effort.

If you want a structured framework for organizing comps and writing your argument, the DIY appeal kit at TaxFightBack walks through this exact process with templates you fill in yourself. You keep the full savings with no contingency cut.

For context on how other high-value metros handle DIY protests, see how to protest property taxes in similar counties like Williamson County, Texas and Collin County. The Texas process differs (Appraisal Review Boards vs. Kansas COTA), but the evidence-gathering logic is the same.

What evidence wins a Johnson County property tax appeal?

The appraiser's office is not moved by your sense of unfairness. They respond to data. Two categories of evidence reliably move the needle: comparable sales and documented condition defects ^[11].

Comparable sales (comps). A comp that sold for $30,000 below your appraised value, and that is genuinely similar to your property, is worth more than any argument you can make in words. Three solid comps pointing in the same direction is a very strong case. Five mediocre comps pointing the same general way is almost as good. The county appraiser's own sales database is public, so you are using their data against their model.

When picking comps, skip the temptation to grab the cheapest sales in your zip code. Appraisers dismiss comps that are not genuinely comparable. Stay close in size, age, style, and location. Adjust mentally for differences: a comp with a finished basement when yours is unfinished should be valued lower, all else equal.

Condition evidence. Mass appraisal models assume average condition for homes in their class ^[12]. If your home is in below-average condition for its age and neighborhood, you are being overvalued by design. A licensed contractor's repair estimate, a home inspection report from the past year, or dated photos of specific defects (roof, foundation, HVAC, electrical) all document condition the model ignored.

Functional obsolescence. An odd floor plan, a layout buyers in your market do not want, or obsolete mechanical systems can support a lower value too. Harder to quantify, but not impossible.

What does not work. Saying your neighbor pays less in taxes is not evidence (their value might be wrong too, or their home is genuinely worth less). Your purchase price from years ago is not evidence of current value unless you bought very recently. General complaints about property taxes being too high go nowhere in a value-based appeal.

When are Johnson County property taxes due and how do you pay?

Kansas property taxes are billed in arrears and split into two installments ^[6]. The tax bill for a given year goes out in late November after the county compiles all the levy data.

• First half due: December 20 of the tax year.
• Second half due: May 10 of the following year.

If December 20 falls on a weekend or holiday, the due date shifts to the next business day. Same for May 10. Missing either date triggers interest at 1.5% per month on the unpaid balance under K.S.A. 79-2004 ^[6].

Payment options include online payment through the Johnson County Treasurer's website (credit/debit and e-check), in person at the Treasurer's Office at 111 S. Cherry St., Suite 1200, Olathe, in person at any Johnson County K-Tag location, by mail (postmark date controls, not delivery date), and through many Kansas banks that act as collection agents ^[8]. For online payment options and how they compare across counties, see our guide to online tax payment for property.

Escrow holders: if your lender pays from an escrow account, your lender gets the tax bill and you should see the payment on your loan servicing statement. But the legal obligation is still yours. If your lender misses it, the penalties land on you, so check your county record annually even when you escrow.

Partial payments are not accepted for the first or second half installments. You pay in full or not at all on each installment date.

How does Johnson County compare to other large metro counties?

Johnson County sits at a middle-range effective tax rate nationally. Its 1.2 to 1.5% effective rate on market value runs well above California's Prop 13-constrained counties (often 0.7 to 0.9%) but below the highest-burden metros ^[10]. Here is a rough comparison using recent data.

County	State	Approx. Effective Rate on Market Value
Johnson County, KS	Kansas	1.2 to 1.5%
Hennepin County, MN	Minnesota	1.1 to 1.4%
Collin County, TX	Texas	1.8 to 2.2%
Williamson County, TX	Texas	1.9 to 2.3%
Santa Clara County, CA	California	0.7 to 0.9%
LA County, CA	California	0.7 to 0.9%
Miami-Dade County, FL	Florida	0.9 to 1.2%

Kansas homeowners pay more than California homeowners on similar values, largely because California caps annual assessment increases at 2% under Proposition 13 and California owners bank that compounding discount over time. Johnson County reassesses to full market value every year, so rising home prices flow straight into rising tax bills with no lag.

The comparison to Texas counties is instructive. People asking about property tax protest in Bexar County are dealing with effective rates around 2.0 to 2.5%, materially higher than Johnson County ^[10]. The Texas system also runs mandatory protest hearings at Appraisal Review Boards, a structure with no direct equivalent in Kansas. The evidence strategy, comps plus condition documentation, is the same everywhere.

Richland County, South Carolina is another common comparison search. Its effective rate runs around 0.5 to 0.7% for owner-occupied residential property because South Carolina caps the assessment ratio for primary residences at 4% of fair market value, less than half of Kansas's 11.5% residential ratio ^[9]. Different state, very different structure.

What happens if you don't pay Johnson County property taxes?

Kansas property tax delinquency follows a specific legal timeline you should know before deciding to delay payment.

Interest accrues at 1.5% per month (18% annually) on any unpaid balance after the December 20 or May 10 due dates ^[6]. That rate is not negotiable and compounds on the outstanding balance. After two years of delinquency, the county treasurer may begin the tax sale process under K.S.A. 79-2801 and following ^[6]. Tax sales in Kansas are in rem proceedings: the county is not suing you personally but is placing the tax lien on the property itself.

If the property goes to a tax sale and a third party buys the tax lien certificate, you have a statutory right to redeem the property for up to two years after the sale by paying all delinquent taxes, interest, and costs ^[6]. Once that two-year redemption window closes without redemption, you lose title.

Johnson County does pursue delinquencies. Its delinquency rate runs lower than many counties nationally because owner incomes skew higher, but the process is real and the redemption period is genuinely two years, not open-ended.

If you are in financial hardship, contact the Kansas Department of Revenue about the homestead refund programs before the situation escalates. There is no formal payment plan for current-year taxes at the county level, but calling the Treasurer's Office early beats ignoring the bill.

Commercial property taxes in Johnson County: what's different?

Commercial real estate owners in Johnson County face two structural differences from residential owners. First, the assessment ratio is 25% of appraised value rather than 11.5% ^[2]. On a $2 million commercial building, that means a $500,000 assessed value before any levy is applied. At 115 mills, the annual tax bill is $57,500. The math scales hard.

Second, commercial appeals almost always end up in the regular (non-small claims) division of COTA rather than the expedited track, because most commercial properties exceed the $2 million appraised value ceiling for small claims. That means more formal procedures, a likely need for a licensed appraiser's report (a MAI appraisal), and potentially an attorney. The informal track through the appraiser's office is still available and still worth filing first.

Commercial owners also need to understand the income approach to value. The appraiser's office models income-producing commercial properties using market cap rates and market rental rates. If your property's actual rent roll shows below-market rents (long-term leases signed years ago at lower rates), that is a legitimate argument for a lower value. Bring rent rolls, lease abstracts, and vacancy data.

For context on how large commercial markets handle high-value appeals, the guides on NYC property tax and LA County property tax cover income-approach appeals in depth. The Kansas procedure differs but the income-approach logic carries over.

Any Johnson County commercial owner carrying a bill over $50,000 a year should seriously check whether the assessed value is defensible. Even a 5% reduction on a $2 million building saves $2,875 annually at current rates. A MAI appraisal, typically $2,500 to $5,000 for a standard commercial property, can pay for itself in year one.

Where do Johnson County property tax dollars actually go?

Your property tax bill funds a mix of local government operations, and the breakdown matters when you are weighing whether your community's spending justifies the levy. The exact distribution varies by location within the county, but for a typical Overland Park homeowner in USD 512, the approximate allocation is:

• School district (USD 512): roughly 50 to 55% of the total bill.
• County general fund: roughly 15 to 20%.
• City of Overland Park: roughly 10 to 15%.
• County library, fire district, other special funds: roughly 10 to 15%.

The school district's share dominates, and it is set by the Kansas Legislature as well as the local school board. The state sets a minimum uniform mill levy for schools and districts add local levies on top ^[7]. Even if the county general levy is flat, a school bond issue can push your bill up meaningfully.

The Johnson County budget process is public. The county publishes its annual budget documents on its website, and the County Commissioners hold public hearings before adopting the budget and the levy each year ^[1]. If you disagree with the levy (not the value), attending a levy hearing and speaking during public comment is the right mechanism. Appealing your assessed value is the right mechanism for the appraisal side.

The two problems (values too high, levies too high) need two different responses. Most homeowners mix them up, which is why so many appeals get dismissed before they even start. Keep them separate.

Frequently asked questions

What is the Johnson County property tax appeal deadline?

The informal appeal deadline is March 31 of the tax year, following assessment notices mailed by March 1. If you miss March 31, you have a second window to appeal to the Kansas Court of Tax Appeals (COTA) after receiving your November tax bill and before December 20 of that same year. File by March 31 whenever possible. The informal route is easier and costs nothing.

How do I find out my Johnson County appraised value?

Go to the Johnson County Appraiser's website and use the online parcel search tool. You can look up any property by address or parcel number. The record shows your current appraised value, prior year value, property characteristics (square footage, year built, etc.), and recent sales data the appraiser used in the valuation. Check this every February before the mailed notice arrives.

Can I appeal my Johnson County property taxes without a lawyer?

Yes, absolutely. The informal appeal at the Appraiser's Office is designed for self-represented homeowners. The COTA small claims division (for properties valued under $2 million) is also built to be accessible without legal counsel. Bring comparable sales and any condition documentation. Most residential informal appeals are resolved at the appraiser level without any formal hearing.

What is the homestead exemption in Johnson County, Kansas?

Kansas does not have a traditional homestead exemption that reduces assessed value directly. Instead, it has the Homestead Refund program run by the Kansas Department of Revenue, which refunds a portion of property taxes paid to qualifying homeowners 55 and older with household income under $40,200. The refund can cover up to 75% of taxes on the first $350,000 of appraised value. Apply by April 15 via Schedule K-40H.

How much can I save by appealing my Johnson County property tax assessment?

It depends on how far off your appraised value is. A 10% overvaluation on a $450,000 home means your appraised value is $45,000 too high. At 115 mills with an 11.5% assessment ratio, correcting that saves roughly $595 per year. Winning an appeal does not reduce the levy rate, only the assessed value. Real savings accumulate over multiple years since a corrected value typically carries forward.

When are Johnson County property tax bills mailed and when are they due?

Tax bills go out in late November each year. The first half is due December 20 of the tax year. The second half is due May 10 of the following year. Missing either date triggers interest at 1.5% per month (18% annually) under K.S.A. 79-2004. If your mortgage lender escrows for taxes, confirm payment in your loan statements, because the obligation is still legally yours.

Does Johnson County reassess property every year?

Yes. Kansas law requires the county appraiser to set a new appraised value for every real property parcel as of January 1 each year. There is no cap on how much the value can increase from year to year, unlike California's Prop 13. Rising home prices flow directly into rising tax bills in Johnson County without the multi-year lag found in some other states.

What is the assessment ratio for residential property in Johnson County?

The Kansas statewide residential assessment ratio is 11.5% of appraised (fair market) value, set by statute. Commercial property is assessed at 25% of appraised value. Agricultural land assessed at use value is typically assessed at 30%. These ratios are set by state law and apply uniformly across all Kansas counties, including Johnson County.

How does the Johnson County appeal process differ from how you protest property taxes in Bexar County?

In Bexar County, Texas, you protest to an Appraisal Review Board, a panel of local citizens, under Texas Tax Code Chapter 41. In Johnson County, Kansas, the first step is an informal meeting with staff at the Appraiser's Office, then a formal appeal to the Kansas Court of Tax Appeals if needed. Texas also uses a 100% assessment ratio with no separate residential/commercial split. The evidence logic is identical in both states, but the procedural steps and deadlines differ significantly.

How does Johnson County property tax compare to Richland County, SC?

Richland County, South Carolina assesses owner-occupied homes at 4% of fair market value, versus Kansas's 11.5%. Richland County's effective rate on market value is roughly 0.5 to 0.7% for primary residences. Johnson County's effective rate is 1.2 to 1.5%. The difference is primarily the assessment ratio, not the mill levy. South Carolina's 4% ratio is one of the lowest primary-residence ratios in the country.

What documents do I need for a Johnson County property tax appeal?

Bring: (1) a printout of your property record card showing the county's data and any errors; (2) three to five comparable sales of similar homes that sold for less than your appraised value, from the county's own sales database or public MLS records; (3) photos and any contractor estimates documenting condition defects the model could not see; and (4) a recent independent appraisal if you have one. You do not need all four, but more evidence means a stronger case.

Is there a veterans property tax exemption in Johnson County, Kansas?

Yes. Kansas exempts $80,000 of appraised value for veterans with a service-connected disability rating of 50% or higher from the VA. At 115 mills and an 11.5% assessment ratio, that exemption is worth roughly $529 per year in tax savings. Surviving spouses of qualifying veterans may also be eligible. Apply at the Johnson County Appraiser's Office with your VA disability rating letter.

Can I appeal a Johnson County commercial property tax assessment myself?

You can file the informal appeal yourself at no cost. For properties valued over $2 million, a formal COTA appeal usually needs a MAI appraisal report ($2,500 to $5,000 for standard commercial properties) to be taken seriously, though an attorney is not legally required. On high-value commercial properties, the cost of a professional appraisal usually justifies itself given the tax savings at stake.

What happens after I win a Johnson County property tax appeal?

If the appraiser's office reduces your value at the informal level, they issue a corrected notice. The corrected value flows into that year's tax bill calculation. If you already paid based on the higher value, the county issues a refund for the difference with interest. If the reduction happens after you filed with COTA, the refund follows the court's order. Either way, the corrected value becomes the starting point for the next year's appraisal.

Sources

1. Johnson County, Kansas Appraiser's Office official website: Johnson County Appraiser determines appraised values, informal appeal deadline is March 31, and levy data by city is published annually.
2. Kansas Statutes Annotated, K.S.A. 79-1458 and K.S.A. 79-1448 (Kansas Legislature official site): Kansas law requires county appraisers to value real property at fair market value as of January 1; residential assessment ratio is 11.5%; commercial is 25%; informal appeal right and March 31 deadline established by statute.
3. Kansas Department of Revenue, Homestead Refund and SAFESR program page: Homestead Refund available to homeowners 55+ with income under $40,200; SAFESR for age 65+ with income under $20,900; refund up to 75% of taxes on first $350,000 of appraised value; file by April 15.
4. Kansas Department of Revenue, Disabled Veterans Property Tax Exemption guidance: Kansas exempts $80,000 of appraised value for veterans with a VA service-connected disability rating of 50% or higher.
5. Kansas Court of Tax Appeals (COTA) official site: COTA hears property tax appeals statewide; small claims division covers appraised values under $2 million; 30-day window to file after informal decision; K.S.A. 74-2438 governs jurisdiction.
6. Kansas Statutes Annotated, K.S.A. 79-2004 and K.S.A. 79-2801 (Kansas Legislature official site): Property taxes due December 20 (first half) and May 10 (second half); interest at 1.5% per month on delinquent balances; tax sale process begins after two years of delinquency; two-year redemption period.
7. Johnson County, Kansas Treasurer's Office, tax payment information: Johnson County Treasurer accepts online, in-person, by-mail, and bank collection payment methods; partial payments not accepted; postmark date controls for mailed payments.
8. Lincoln Institute of Land Policy, Significant Features of the Property Tax database (state-by-state assessment ratios): Kansas residential assessment ratio of 11.5% and commercial ratio of 25% documented; South Carolina's 4% primary-residence ratio documented for comparison.
9. Tax Foundation, Property Taxes by State (annual report): Effective property tax rates by state and major county; Johnson County's effective rate on market value estimated at 1.2–1.5%; Texas counties including Bexar at approximately 2.0–2.5%.
10. Appraisal Institute, mass appraisal methodology overview: Mass appraisal uses statistical models applied county-wide and cannot account for individual property condition defects; comparable sales and condition documentation are the primary evidence types in residential appeals.
11. International Association of Assessing Officers (IAAO), Standard on Mass Appraisal of Real Property: Standard industry methodology for mass appraisal uses sales comparison approach with 12-24 month look-back period; model assumes average condition for property class.