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Read. Follow. Verify.Missouri HB 1800 lowers inflationary property assessment growth cap to three percent starting in 2027
Last action · March 23, 2026: Second read and referred: Select Committee on Property Taxes and the State Tax Commission(S)Sponsor: Mark Matthiesen
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What This Bill Would Do
Representative Mark Matthiesen introduced House Bill 1800 to lower the cap for real and personal property assessments within political subdivisions from five percent to three percent beginning January 1, 2027. The bill modifies calculation rules for s, refines sales ratio study provisions, and updates compliance oversight procedures involving the state auditor and attorney general.
Property owners across Missouri face a tighter limit on how much their property tax assessment bases can automatically grow due to inflation, directly affecting local government tax revenues and individual tax burdens.
Who It Would Affect
Groups the bill's text would affect if enacted, as described in the record. Being affected is not a position for or against it.
taxpayers
Property owners experience modified limits on inflationary assessment increases and gain statutory mechanisms to challenge noncompliant tax rates.
political subdivisions
Local taxing entities must adjust their tax rate calculations and levy procedures to comply with the revised inflationary growth caps and state auditor oversight.
school districts
School districts must follow specific rules for blending tax rates across property subclasses and accounting for state-assessed utility and railroad properties.
county assessors
Assessors are required to maintain separate records of real property valuation increases resulting from new construction and improvements for each subclass.
Key Facts
You don't have to trust us. Each fact below is taken straight from the official document - click any one to see the exact passage, highlighted in the original.
Frequently Asked Questions
What does HB 1800 change about property tax assessment growth?
What happens if a political subdivision adopts an unlawful tax rate under this bill?
What else do you want to know?
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Votes, people, money & the original sourceWhere This Stands
Currently passed chamber. The next step in the legislative lifecycle is Law.
Procedural history
26 actions- Mar 23, 2026SenateCommitteeSecond read and referred: Select Committee on Property Taxes and the State Tax Commission(S)
- Mar 9, 2026SenateReported to the Senate and First Read (S)
- Mar 9, 2026HouseFloorThird Read and Passed (H)
- Mar 9, 2026HouseTaken Up for Third Reading (H)
- Mar 9, 2026HouseCommitteeReported Do Pass (H)
- Mar 9, 2026HouseCommitteeVoted Do Pass (H)
Show 20 earlier actions
- Mar 9, 2026HouseExecutive Session Completed (H)
- Mar 5, 2026HouseCommitteeReferred: Fiscal Review(H)
- Mar 4, 2026HousePerfected with Amendments (H)
- Mar 4, 2026HouseTitle of Bill - Agreed To
- Mar 4, 2026HouseTaken Up for Perfection (H)
- Mar 2, 2026HousePlaced on the Informal Perfection Calendar (H)
- Feb 26, 2026HousePlaced Back on Formal Perfection Calendar (H)
- Feb 11, 2026HousePlaced on the Informal Perfection Calendar (H)
- Feb 9, 2026HouseCommitteeReported Do Pass (H)
- Feb 9, 2026HouseCommitteeVoted Do Pass (H)
- Feb 9, 2026HouseExecutive Session Completed (H)
- Jan 29, 2026HouseCommitteeReferred: Rules - Legislative(H)
- Jan 22, 2026HouseCommitteeReported Do Pass (H)
- Jan 22, 2026HouseCommitteeVoted Do Pass (H)
- Jan 22, 2026HouseExecutive Session Completed (H)
- Jan 15, 2026HousePublic Hearing Completed (H)
- Jan 8, 2026HouseCommitteeReferred: Special Committee on Tax Reform(H)
- Jan 8, 2026HouseFloorRead Second Time (H)
- Jan 7, 2026HouseIntroducedRead First Time (H)
- Dec 1, 2025HouseIntroducedPrefiled (H)
Version history
Only one version on file - nothing to compare yet. As later stages (committee substitute, engrossed, enrolled) are captured, the redline appears here.
View official text →Lobbying Activity
No state lobbying filings in our records match this bill. Federal lobbying reports (LDA) cover Congress, so they are not listed on state bills.
Full breakdown
Who this bill affects and the strongest case for and against it, written only from the bill’s own text.
Sponsors
Discoveries
Patterns POLISCOPE noticed across the record. These are observations to investigate, not conclusions.
Stricter Inflationary Cap on Property Assessments
HB 1800 transitions Missouri from a five percent inflationary assessment growth cap to a three percent cap starting in 2027.
Connected Entities
Sources
house.mo.gov
Analysis Score
0–100- Significance80How much this matters to a regular citizen
- Controversy60Intensity of disagreement among stakeholders
- Entertainment10Compellingness for a non-policy-wonk reader
- Buzz40Current news / social attention level
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