How to Appeal Your Property Tax in Missouri: Step-by-Step Guide

Why Missouri Property Tax Appeals Matter

Missouri reassesses residential property every odd-numbered year — 2025, 2027, 2029, and so on. When your assessed value jumps, your tax bill follows. In recent reassessment cycles, some Missouri homeowners have seen 20-40% increases in assessed value in a single cycle, driven by rapid home price appreciation between 2020 and 2025. If your assessment doesn’t reflect your home’s actual condition, location disadvantages, or legitimate comparable sales, you have the right to appeal — and the process is more accessible than most homeowners realize.

The appeal window is short (typically June through July of the reassessment year), the evidence requirements are specific, and the process moves through three levels: informal review, Board of Equalization, and State Tax Commission. About 40% of informal appeals result in some reduction. At the Board of Equalization level, homeowners who bring solid comparable sales data win roughly 30-35% of the time.

This guide walks through each step, with specific forms, deadlines, and strategies for Missouri’s system.

How Missouri Property Assessment Works

Before you appeal, understand how the system calculates your tax bill. Missouri uses a two-step process:

1. Assessed value: The county assessor determines your property’s market value and multiplies it by the assessment ratio. For residential property, Missouri’s assessment ratio is 19%. So a home with a $250,000 market value has an assessed value of $47,500.
2. Tax levy: Your local tax districts (school, city, county, fire, library, etc.) apply their levy rates to the assessed value. A combined levy of 8.0 per $100 of assessed value would produce a tax bill of $3,800 ($47,500 x 0.08).

You can only appeal the assessed (market) value — not the levy rates. The levies are set by voter-approved bonds and operating rates. But reducing your assessed value directly reduces your tax bill proportionally.

If you successfully appeal and reduce the market value to $220,000, your assessed value drops to $41,800, and your tax bill drops to $3,344 — a savings of $456 per year. Over five years (until the next reassessment), that’s $2,280. The property tax calculator can model different scenarios for your situation. For background, read our guide: Missouri property tax system explained.

Step 1: Review Your Assessment Notice

Missouri county assessors mail assessment notices in late May or early June of each odd-numbered year. The notice shows your property’s new assessed value and the previous assessed value. Review it immediately — the appeal clock starts ticking when the notice is mailed.

Check for obvious errors first:

• Square footage: Does the assessor’s record match your home’s actual size? Errors of 100-300 square feet are not uncommon, especially for homes that have been remodeled or have finished basements counted incorrectly.
• Property characteristics: Bedroom count, bathroom count, garage spaces, lot size, year built. Any error in the assessor’s records that inflates value is grounds for correction.
• Land vs. improvement allocation: If the assessor allocated too much value to land (which doesn’t depreciate), the overall assessment may be inflated.
• Classification: Confirm your property is classified as residential (19% ratio) rather than commercial (32% ratio). Misclassification is rare but devastating to your tax bill.

You can view your property record online through your county assessor’s website. Jackson County, St. Louis County, St. Charles County, and most Missouri counties maintain online property data portals. Print your property record and note any discrepancies.

Step 2: Gather Comparable Sales Evidence

The strongest appeal argument is that your home’s assessed value exceeds what comparable homes have actually sold for. You need 3-5 comparable sales (called “comps”) that support a lower value. Good comps share these characteristics with your property:

• Within 1 mile of your home (closer is better)
• Sold within the past 12-18 months
• Similar size (within 20% of square footage)
• Similar age and construction type
• Similar lot size and condition

Sources for comparable sales data:

• Your county assessor’s website (free, shows actual sale prices)
• Zillow, Redfin, or Realtor.com (filter by recently sold)
• A real estate agent’s MLS access (ask politely — many agents will pull comps for free as a community service or business development gesture)

Organize your comps in a simple table showing address, sale date, sale price, square footage, and price per square foot. If your comps average $220,000 but the assessor valued your home at $250,000, you have a $30,000 argument for reduction.

Also note any negative factors specific to your property that reduce its value relative to neighbors: a busy street, a small lot, deferred maintenance, an awkward floor plan, or proximity to commercial or industrial property. Take photos documenting these conditions.

Step 3: File an Informal Appeal With the Assessor

Before going to the Board of Equalization, contact your county assessor’s office for an informal review. Many counties encourage this as a first step, and it can resolve simple errors without a formal hearing.

The informal review process varies by county:

• Jackson County (KC): Call or visit the Assessment Department. Bring your property record and comps. The assessor’s staff will review your evidence and may adjust the value on the spot or within a few days.
• St. Louis County: Contact the Assessor’s Office during the review period (typically June). Schedule a meeting or submit documentation by mail/email.
• Other counties: Call the assessor’s office and ask about the informal review process. Most counties accommodate walk-ins during the review window.

If the informal review resolves your concern, you’re done. If the assessor declines to adjust or the adjustment is insufficient, proceed to the Board of Equalization.

Step 4: Appeal to the Board of Equalization

Every Missouri county has a Board of Equalization (BOE) that hears property tax appeals. The BOE is a quasi-judicial body — you present evidence, the assessor’s office may present counter-evidence, and the board makes a decision.

Deadline: You must file your appeal with the BOE by the second Monday in July (in reassessment years). Some counties have slightly different deadlines — confirm with your county clerk’s office. Missing this deadline forfeits your right to appeal for that cycle.

How to file:

1. Obtain the appeal form from your county clerk or assessor’s office. In many counties, this is available online as a downloadable PDF.
2. Complete the form with your property identification number, current assessed value, the value you believe is correct, and a brief explanation of why.
3. Attach your comparable sales evidence, photos of property conditions, and any other supporting documentation.
4. Submit the form by the deadline. Most counties accept in-person, mail, and sometimes email submissions.

The hearing: BOE hearings are typically 15-30 minutes. You’ll present your case (comps, property condition, errors in the assessor’s records), and the assessor’s representative will respond. Be polite, organized, and data-driven. Emotional arguments don’t work. Numbers work.

Tips for the BOE hearing:

• Bring printed copies of all evidence for each board member (typically 3 members)
• Lead with your strongest comparable sales
• Point out any factual errors in the assessor’s property record
• If your property has condition issues (roof age, foundation problems, outdated systems), bring photos and repair estimates
• Stay focused on value — don’t argue about tax rates, government spending, or fairness

Step 5: Appeal to the State Tax Commission (If Needed)

If the BOE rules against you and you believe the evidence supports a lower value, you can appeal to the Missouri State Tax Commission (STC). This is a more formal process:

• Deadline: File within 30 days of the BOE’s written decision
• Process: The STC conducts a hearing (sometimes by phone or video) with testimony and evidence. You can represent yourself or hire an attorney/property tax consultant.
• Cost: No filing fee. If you hire representation, typical costs run $500-$2,000 depending on complexity.
• Outcome: The STC can increase, decrease, or maintain the assessed value. The decision is binding unless appealed to circuit court.

Most residential homeowners don’t reach this level. The STC handles about 4,000 cases annually statewide, with roughly 60% involving commercial property. For residential cases, the STC is most useful when the assessment involves a significant dollar amount (e.g., a $50,000+ overvaluation on a high-value property) that justifies the time investment.

Missouri’s Odd-Year Reassessment Cycle

Unlike states that reassess annually, Missouri’s odd-year cycle means your assessed value stays fixed for two years between reassessments. This creates a specific pattern:

• Reassessment year (odd): New assessed values are set. Appeal window opens (June-July). Tax bills reflect new values starting in the following year.
• Non-reassessment year (even): Assessed values remain unchanged. No appeal window (except for factual errors). Your tax bill may still change if levy rates are adjusted.

This means a successful appeal in 2025 reduces your taxes for 2025 and 2026 (until the 2027 reassessment). The value resets in 2027, when a new reassessment occurs. You may need to appeal again if the 2027 assessment overcorrects.

For homeowners who purchased their property recently, the sale price is typically the strongest evidence of market value. If you bought your home for $230,000 in 2024 and the 2025 assessment comes in at $260,000, your actual purchase price is powerful evidence that the assessment is too high.

Common Grounds for a Successful Appeal

Special Considerations by County

Jackson County (Kansas City): Jackson County’s assessment office has faced controversy over uneven assessments and administrative issues. The county uses a mass appraisal system that sometimes produces outlier values for individual properties. Appeals are common — Jackson County processes more BOE appeals than most Missouri counties. The county assessor’s office is located at 415 E. 12th Street, Kansas City.

St. Louis County: St. Louis County’s assessment process is generally well-run, but rapid appreciation in popular neighborhoods (Maplewood, Webster Groves, Richmond Heights) has produced significant increases. The county assessor provides online lookup tools and a detailed appeal process on their website.

St. Louis City: The city’s independent assessor operates separately from the county. The city’s high base tax rate (3.2% effective) means even small assessment reductions produce meaningful tax savings. The Board of Equalization process is similar to the county.

St. Charles County: Fast-growing areas (Wentzville, O’Fallon) have seen some of the largest assessment increases in the state. New construction and rapid sales activity give the assessor abundant data points, but values can sometimes reflect peak-market transactions that don’t represent the broader market.

For buyers still in the purchasing process, understanding property taxes is part of smart budgeting. The mortgage calculator includes a property tax field, and the closing cost calculator helps estimate total upfront costs. First-time buyers can also explore assistance programs that help with both down payments and ongoing ownership costs.

Hiring Professional Help

You don’t need a lawyer or consultant for most residential appeals — the process is designed for self-representation. However, if your property is valued above $500K or the stakes are high, consider hiring a property tax consultant or real estate attorney experienced in Missouri assessment appeals.

Property tax consultants typically charge one of two ways:

• Contingency fee: 25-40% of the first year’s tax savings. No savings = no fee. This aligns incentives but can be expensive if you win a large reduction.
• Flat fee: $300-$1,000 for residential appeals, depending on complexity. More cost-effective for large reductions.

Real estate appraisers can also provide formal appraisal reports for appeal purposes. A residential appraisal costs $350-$500 and carries significant weight with the BOE and STC. If your potential tax savings exceed $1,000 annually, the appraisal cost is easy to justify.

Whether you handle the appeal yourself or hire help, the key is acting within the deadline. Mark the second Monday in July on your calendar for every odd-numbered year and review your assessment notice the moment it arrives.

After the Appeal: What Happens Next

If your appeal succeeds at the informal or BOE level, the assessor’s office adjusts your assessed value. Your tax bill for the current and following year reflects the reduced value. The reduction stays in effect until the next reassessment (two years later).

If your appeal fails, your assessed value remains unchanged. You can try again at the next reassessment. Take notes on why the BOE rejected your case — perhaps your comps were too far away, too old, or too different from your property. Address those weaknesses in your next appeal.

Appealing your property tax assessment is one of the few ways homeowners can directly reduce their housing costs after purchase. In a state like Missouri where property taxes fund schools, fire districts, and local services, the stakes are real — and so are the savings. The home buying guide covers additional strategies for managing ownership costs, and the home services hub can help with maintenance budgets that affect your property’s condition and value over time.

Frequently Asked Questions

When can I appeal my property tax assessment in Missouri?

Missouri conducts residential reassessments in odd-numbered years (2025, 2027, 2029). Assessment notices are mailed in late May or early June of the reassessment year. The deadline to file an appeal with the Board of Equalization is typically the second Monday in July. You must act within this narrow window — there is no mechanism to appeal outside of the reassessment year except for factual errors in the property record.

What evidence do I need to win a property tax appeal?

The strongest evidence is 3-5 comparable home sales within 1 mile of your property that sold for less than your assessed value within the past 12-18 months. Also effective: documentation of factual errors in the assessor’s records (wrong square footage, bedroom count, etc.), a recent purchase price that supports a lower value, and photos/estimates documenting property condition issues. Emotional arguments, complaints about tax rates, or comparisons to different property types are not effective.

Can my assessment go up if I appeal?

At the BOE level, the board can only decrease or maintain your assessed value — they cannot raise it. However, at the State Tax Commission level, the STC has the authority to increase, decrease, or maintain the value. In practice, the STC rarely increases residential values, but the theoretical risk exists. Most homeowners stop at the BOE level unless the dollar amount justifies the STC appeal.

How much does it cost to appeal my property tax?

Self-representation at the BOE costs nothing except your time. If you hire a property tax consultant, expect to pay either a contingency fee (25-40% of first-year savings) or a flat fee ($300-$1,000). A formal residential appraisal to support your case costs $350-$500. For most homes assessed under $300K, self-representation with 3-5 comps is sufficient — professional help is most justified for higher-value properties where the potential savings are larger.

Does Missouri offer any property tax relief programs?

Yes. Missouri’s Property Tax Credit (Circuit Breaker) provides relief for seniors (65+) and disabled homeowners with incomes below $30,000 (single) or $34,000 (married). The credit can reach up to $1,100 for renters or $750 for homeowners. Additionally, Missouri law caps assessed value increases at the rate of inflation in some circumstances. These programs are separate from the appeal process and are claimed on your state income tax return. See the selling guide for how tax considerations factor into the decision to sell or stay in your current home.