Back to Illinois Overview
FIPS: 17043•Rank #54 National•Rank #5 in IL
DuPage County, IL
Forward-Looking Municipal Debt, Assessment Lag & Carrying Cost Audit
Elevated Tax Drift Risk
96% Conf.
Tax Drift Index
58.3/ 100
Elevated Drift Risk
DuPage County Executive Risk Briefing
MSRB EMMA Disclosures & US Census BureauAugust 2026
DuPage County carries a Elevated Tax Drift Score (58.3/100) based on $8,600 in overlapping municipal debt per capita and a +21.5% CAD assessment lag spread. Projected 3-year millage escalation of +0.26% (+26 bps) indicates an estimated +$2,387/yr escrow adjustment on median-priced properties.
Median Home: $390,000Median Income: $104,000Effective Tax: 2.2%
Municipal Debt Per Capita
$8,600
8.3% of Median Income
CAD Valuation Lag
+21.5%
Assessed Value trailing Market HPI
3-Yr Millage Escalation
+26 bps
Effective Rate: 2.2% → 2.5%
Projected Annual Escrow Shock
+$2,387/yr
Estimated on median assessed home
Interactive Property Tax & Escrow Shock Simulator
Model forward-looking ad valorem tax obligations and monthly escrow adjustments for a specific parcel in DuPage County, IL.
$390,000
$0
Current Annual Tax
$8,658
@ 2.22% eff. rate
Year 3 Projected Tax
$11,045
@ 2.48% eff. rate
Net Escrow Increase
+$2,387/yr
+$199/mo mortgage escrow
Projected Shock Attribution Breakdown+26 bps rate shift
1. Muni Bond Debt Service
+11 bps
I&S bond amortization
2. Operating Deficit Drift
+16 bps
M&O budget expansion
3. CAD Valuation Catch-up
+$1,210/yr
+$54,503 assessed base
Overlapping Taxing Jurisdictions & Debt Obligations
Breakdown of autonomous debt issuers assessing ad valorem property taxes on parcels within DuPage County.
| Entity Name | Entity Type | Outstanding Bond Debt | Debt / Student or Cap | Adopted Millage |
|---|---|---|---|---|
| Naperville Community Unit School District 203 | ISD | $280.0M | $17,200 | 1.350% |
5-Year Historical Drift Score & Effective Rate Trajectory
2022
51
2.1% eff.
2023
54
2.1% eff.
2024
55
2.2% eff.
2025
57
2.2% eff.
2026
58.3
2.2% eff.
Statutory Constraint & Legislative Policy
Subject to PTELL cap; suburban school district operating levies constitute roughly 68% of total property tax bills.
Data Provenance & Audit Citations