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State Municipal Index • IA
Iowa Property Tax Drift Index
State Avg Drift Score
50/100
Iowa Municipal Risk Briefing
State Comptroller & US Census Bureau (IA)August 2026
Iowa maintains an average TaxDrift Score of 50/100 across monitored jurisdictions. Overlapping municipal bond issuances and assessment equalization rollbacks determine local millage carrying costs under statutory rules.
Population
3,207,004
Avg Effective Tax Rate
1.1%
Total Tracked Muni Debt
$14.4B
Counties Monitored
12
Statutory Tax Caps & Voter-Approval Rules (IA)
Rollback calculation limits statewide residential assessment growth to 3% per year.
Audited Counties in Iowa
Iowa County Tax Drift Leaderboard
0 Jurisdictions Audited| Rank | Jurisdiction | Drift Score | Risk Tier | Muni Debt / Cap | CAD Lag Spread | 3-Yr Tax Shock | Audit |
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