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FIPS: 36059•Rank #23 National•Rank #5 in NY
Nassau County, NY
Forward-Looking Municipal Debt, Assessment Lag & Carrying Cost Audit
Elevated Tax Drift Risk
96% Conf.
Tax Drift Index
63.7/ 100
Elevated Drift Risk
Nassau County Executive Risk Briefing
MSRB EMMA Disclosures & US Census BureauAugust 2026
Nassau County carries a Elevated Tax Drift Score (63.7/100) based on $10,900 in overlapping municipal debt per capita and a +26.4% CAD assessment lag spread. Projected 3-year millage escalation of +0.24% (+24 bps) indicates an estimated +$4,690/yr escrow adjustment on median-priced properties.
Median Home: $690,000Median Income: $126,000Effective Tax: 2.3%
Municipal Debt Per Capita
$10,900
8.7% of Median Income
CAD Valuation Lag
+26.4%
Assessed Value trailing Market HPI
3-Yr Millage Escalation
+24 bps
Effective Rate: 2.3% → 2.5%
Projected Annual Escrow Shock
+$4,690/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 Nassau County, NY.
$690,000
$0
Current Annual Tax
$15,870
@ 2.30% eff. rate
Year 3 Projected Tax
$20,560
@ 2.54% eff. rate
Net Escrow Increase
+$4,690/yr
+$391/mo mortgage escrow
Projected Shock Attribution Breakdown+24 bps rate shift
1. Muni Bond Debt Service
+8 bps
I&S bond amortization
2. Operating Deficit Drift
+17 bps
M&O budget expansion
3. CAD Valuation Catch-up
+$2,723/yr
+$118,404 assessed base
Overlapping Taxing Jurisdictions & Debt Obligations
Breakdown of autonomous debt issuers assessing ad valorem property taxes on parcels within Nassau County.
| Entity Name | Entity Type | Outstanding Bond Debt | Debt / Student or Cap | Adopted Millage |
|---|---|---|---|---|
| Hempstead Union Free School District | ISD | $240.0M | $32,000 | 1.340% |
5-Year Historical Drift Score & Effective Rate Trajectory
2022
56
2.2% eff.
2023
59
2.2% eff.
2024
61
2.3% eff.
2025
62
2.3% eff.
2026
63.7
2.3% eff.
Statutory Constraint & Legislative Policy
Long Island county with persistent assessment reassessment litigation, shifting tax burdens across classes.
Data Provenance & Audit Citations