Missouri Property Tax Appeal Deadline: Board of Equalization Filing Due the Second Monday in July
Updated August 2026
Where things stand as of August 2026: the 2026 Board of Equalization window closed on July 13, 2026. If you filed with the Board and disagree with its decision, you can still appeal to the State Tax Commission: the complaint is due by September 30, 2026 or within 30 days of the Board's decision, whichever is later (RSMo 138.430), and the Commission cannot extend that date. If you did not file in 2026, the next Board window opens in spring 2027 and closes on the second Monday in July, which is July 12, 2027.
Missouri's statutory Board of Equalization filing deadline is the second Monday in July under RSMo 137.385 (July 13 in 2026, July 12 in 2027). This applies statewide: St. Louis City, St. Louis County, Jackson County (Kansas City), Greene County (Springfield), and Boone County (Columbia) all confirmed the same July 13, 2026 filing date on their own county sites. Appeal hearings themselves are then scheduled for July and into August, but the filing itself is due by the second Monday in July.
Missouri Property Tax Appeal Deadline: The Second Monday in July
General Timeline: Appeals are due to the county Board of Equalization by the second Monday in July (July 13, 2026; July 12, 2027), with hearings held in July and August
Major County Filing Deadlines 2026:
| County | Filing Deadline | Location |
|---|
| St. Louis City | July 13 | St. Louis |
| St. Louis County | July 13 | Clayton |
| Jackson (Kansas City) | July 13 | Independence / Kansas City |
| Greene (Springfield) | July 13 | Springfield |
| Boone (Columbia) | July 13 | Columbia |
Key Facts:
- Statewide statutory deadline: second Monday in July (RSMo 137.385)
- Filing window generally opens May 1
- Hearings scheduled in July and August after filing
- Filing methods vary by county (online, mail, in person)
- Deadline is the same across counties, hearing scheduling is not
Understanding Missouri's System
Annual Timeline:
- January 1: Assessment date (odd years)
- Spring: Assessment notices mailed
- May 1: BOE filing window generally opens
- July 13: BOE filing deadline (second Monday in July)
- July–August: BOE hearings held
- December: Tax bills due
The Compressed Timeline:
- Notice to appeal: Often just days
- Quick turnaround required
- Preparation crucial
- No time to procrastinate
- Miss it = wait 2 years
Biennial Assessment:
- Odd years: Full reassessment
- Even years: Limited appeals
- 2025 = Assessment year
- 2026 = Appeal those values
- Next chance: 2027
Board of Equalization Process
Before the Meeting:
- Get assessment notice
- Check BOE dates immediately
- Decide to appeal quickly
- Gather evidence fast
- Schedule if required
Filing Your Appeal:
- Forms vary by county
- Some online, some paper
- Usually no fee
- Evidence encouraged
- Respectful approach
At the Hearing:
- 10-15 minutes typical
- Present key points
- Local citizens decide
- Informal setting
- Decision often immediate
Evidence That Wins in Missouri
Most Effective:
- Recent comparable sales - Same subdivision ideal
- Property condition - Deferred maintenance, age
- External factors - Traffic, commercial encroachment
- Incorrect data - Square footage, features, improvements
- Income approach - For investment properties
Missouri-Specific Issues:
- Flood plain properties (Mississippi, Missouri Rivers)
- Lead mining area impacts
- Tornado damage (common)
- Agricultural classification
- Historic district restrictions
Regional Considerations:
St. Louis Metro: Urban decay vs gentrification Kansas City: State line competition Rural Missouri: Agricultural transitions Ozarks: Tourism vs residential Bootheel: Economic challenges
Knowing the date is the easy part. The date only matters if the county's number is actually too high, and nobody checks that number for you.
Common Missouri Problems
Problem #1: Urban Neighborhood Variations
- Block-by-block differences
- Gentrification spotty
- Crime impacts vary
- Schools matter hugely
- Individual assessment needed
Solution: Hyper-local comparables only
Problem #2: Agricultural Land Pressure
- Development assumptions
- Actual farming ignored
- Urban sprawl effects
- Highest use valued
- Reality different
Solution: Prove continued agricultural use
Problem #3: River Flooding History
- Mississippi River issues
- Missouri River problems
- Insurance costs soar
- Buyout zones exist
- Values should reflect
Solution: Flood maps, insurance documentation
Problem #4: Cross-Border Competition
- Kansas competition (KC area)
- Illinois issues (St. Louis)
- Tax refugees impact
- Values distorted
- Assessments lag
Solution: Show local economic reality
Regional Strategies
St. Louis County
Challenges:
- 90+ municipalities
- Extreme variations
- Ferguson effects
- Infrastructure age
- School districts crucial
Approach:
- Municipality-specific data
- Recent sales only
- School district analysis
- Crime statistics (careful)
- Professional help
Jackson County (Kansas City)
Challenges:
- Downtown vs suburbs
- Kansas competition
- Sports complex impacts
- Urban core issues
- Rapid changes
Approach:
- Location precision
- Economic factors
- Cross-border comparisons
- Development reality
- Market analysis
Rural Counties
Challenges:
- Limited comparables
- Agricultural base
- Population decline
- Service reductions
- Tax base pressure
Approach:
- Extended area comps
- Economic documentation
- Simple presentation
- Know your board
- Agricultural emphasis
University Towns
Challenges:
- Columbia, Rolla, etc.
- Student rental markets
- Seasonal variations
- Town vs gown
- Unique dynamics
Approach:
- Rental income reality
- Maintenance costs
- Seasonal factors
- Local comparables
- Income approach
Filing Before the Second Monday in July
When Notice Arrives:
- [ ] Confirm your county's filing deadline
- [ ] Calculate days available before the second Monday in July
- [ ] Decision within 48 hours
- [ ] Start evidence file
- [ ] Check appointment requirements
Before the July Deadline:
- [ ] Finalize evidence
- [ ] Complete forms
- [ ] Make appointment (if needed)
- [ ] Organize presentation
- [ ] Practice key points
BOE Hearing (July–August):
- [ ] Arrive early
- [ ] Bring all documents
- [ ] Dress appropriately
- [ ] Present clearly
- [ ] Thank board
If You Miss the July Deadline:
- Very limited options
- Clerical errors only
- Wait until 2027
- Expensive mistake
- Calendar now
Special Missouri Considerations
Agricultural Land
- Chapter 137 assessment
- Productive value only
- Not development potential
- File separate application
- Then appeal if needed
Senior Citizens Tax Credit
- "Circuit Breaker" program
- Income-based relief
- Property tax credit
- State income tax
- Separate from appeal
Disabled Veterans
- Property tax exemption
- Specially adapted housing
- $5,000 reduction
- Must apply first
- Then appeal remainder
Tax Increment Financing (TIF)
- Common in Missouri
- Affects comparables
- Distorts values
- Document impacts
- Board understands
A real AppealDesk order, St. Clair County, Illinois
In June 2026, a homeowner in St. Clair County, Illinois ran the check. The county had their home on record at $455,499, while recorded sales of comparable homes supported about $328,620: an over-assessment of $126,879, worth roughly $2,908 per year if corrected. Their packet laid out the comparable sales, the forms, and the filing steps. Nobody at the county was ever going to run that check for them.
A deadline you meet with no evidence behind it is just paperwork. Comparable sales are what boards actually respond to, and pulling your county's number is where that starts.
County-Specific Tips
St. Louis County
- Largest, most complex
- Online tools helpful
- Professional approach
- Data-driven decisions
- High stakes
Jackson County
- Second largest
- Kansas City dynamics
- Economic documentation
- Professional varies
- Know districts
Greene County
- Springfield growth
- Medical corridor
- University impacts
- Bass Pro effects
- Mixed approaches
Smaller Counties
- Personal relationships
- Simple presentations
- Local knowledge
- Agricultural focus
- Know your board
Your Missouri Action Plan
Today (If the Window Is Open):
- Confirm your filing deadline - County website/clerk
- Mark calendar - Multiple alerts
- Review assessment - Understand increase
- Start documentation - Photos, research
When Notice Arrives:
- Act fast - Days matter
- Verify your filing deadline - Confirm the second Monday in July applies to your county
- Gather evidence - Time limited
- Make decision - Appeal or not
- File/schedule - Don't delay
Filing Strategy:
- Early better - Avoid rush
- Complete package - All evidence
- Professional demeanor - Respectful
- Clear presentation - Time limited
- Follow up - Get decision
The Bottom Line
Missouri's second-Monday-in-July Board of Equalization filing deadline creates a pressure-cooker environment for anyone who waits. With assessment notices arriving in spring and the filing deadline fixed statewide by statute, preparation matters more than speed once notice arrives.
The biennial assessment cycle means a missed July deadline costs you two full years of overpayment. Whether you're in St. Louis, Kansas City, or elsewhere in the state, the second Monday in July is your one filing window each year.
Hearing scheduling within the July–August window varies by county, and how the filing itself is submitted (online, mail, in person) also varies. Mark the second Monday in July now and prepare evidence in advance, since hearings follow soon after filing closes.
Critical Note: The second-Monday-in-July filing deadline (July 13, 2026; July 12, 2027) is Missouri's statutory default (RSMo 137.385), confirmed directly on the St. Louis City, St. Louis County, Jackson County, Greene County, and Boone County government sites. Contact your specific county assessor to confirm your county follows the same date and to get exact hearing scheduling and filing method requirements. Missing it means waiting a full year.
