Environment
No direct effect
Neutral — no direct effect identified.
Benefits
- No material direct effect identified
Risks
- No material direct effect identified
StateIllinoisIntroduced
SB 3540: PROP TX-ASSESSMENT LIMIT
Chapin Rose
SB 3540 status: Introduced — Added as Co-Sponsor Sen. Paul Jacobs (updated Sep 2, 2026).
Source
LegiScan
Confidence
High
Analysis basis
LegiScan full bill text
01
What this bill does
Official summary alongside an AI-generated read on where it stands and why.
Overall Score
53OUT OF 100
Score:53/100 civic fit
Risk:Moderate Risk
Impact:High Impact 85/100
Constitutionality70%
Bipartisan40%
Public opinion80%
Bill summary
What changes
The bill mandates that residential property assessment increases between general assessment years are capped by the CPI percentage change.
Who is affected
Residential property owners, local governments, school districts, and home rule units.
Requirements and enforcement
Assessors must apply a CPI-linked cap to residential valuations, excluding properties that were sold or modified.
Costs and funding
Direct costs include administrative updates to tax assessment systems; indirect costs include potential revenue losses for local taxing bodies.
When it takes effect
Effective upon becoming law; applies to the 2026 assessment year.
Potential benefits
Provides predictable tax bills for homeowners and protects residents from large, unexpected assessment spikes.
Risks and tradeoffs
Limits the ability of local governments to manage inflation-indexed fiscal needs, potentially forcing service cuts.
What is still unknown
The long-term impact on the bond ratings and fiscal stability of specific, high-growth municipalities is not defined.
02
Impact analysis
✦ AI analysisModeled effects across six domains, estimated from bill text and comparable legislation.
Economy
Mixed / Neutral
55%
Benefits
- Limits year-over-year tax burden for homeowners
- Increases predictability for household budgeting
- Excludes improvements from cap to maintain investment incentives
Risks
- Reduces revenue growth for local governments
- Creates fiscal uncertainty for municipal budgets
- May require service reductions or tax rate increases to compensate
Society
Mixed / Neutral
60%
Benefits
- Enhances housing affordability for fixed-income residents
- Prevents displacement caused by rapid assessment growth
- Increases tax stability for family financial planning
Risks
- Risk of reduced funding for public schools
- May lead to cuts in essential community services
- Potential shift of tax burden to commercial properties
Technology Industry
No direct effect
Neutral — no direct effect identified.
Benefits
- No material direct effect identified
Risks
- No material direct effect identified
Civic Accountability
Mixed / Neutral
45%
Benefits
- Standardizes assessment limits across all counties
- Increases transparency in tax assessment growth limits
- Prevents rapid increases in local tax burdens
Risks
- Explicitly preempts local home rule taxing power
- Reduces local government control over local revenue
- Creates potential friction between state and local mandates
Public Health & Safety
No direct effect
Neutral — no direct effect identified.
Benefits
- No material direct effect identified
Risks
- No material direct effect identified
03
How trustworthy & consequential it is
Sourcing already shown above, this is what the analysis found worth flagging.
Source
LegiScan
Official bill text or data from LegiScan.
Confidence
High
Information is complete and verified.
Analysis basis
LegiScan full bill text
Source used for this bill's analysis.
Source note
Preemption of home rule powers may lead to constitutional challenges.
Analysis scope
Does not account for non-residential property assessment impacts.
04
Where it stands
Official record- IntroducedCurrent
- CommitteeUpcoming
- Chamber votesUpcoming
- Final agreementUpcoming
- GovernorUpcoming
- EnactedUpcoming
05
How it affects your district
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06
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