Delaware Property Tax Rate by County: 2025–2026 Reassessment Guide

For more than forty years, Delaware property owners paid taxes based on valuations that bore no resemblance to what their properties were actually worth. Sussex County had not reassessed since 1974. New Castle County last looked at values in 1983. Kent County held out until 1987. Then, in 2020, the Delaware Court of Chancery ruled the whole arrangement unconstitutional, and the state contracted Tyler Technologies to rebuild the system from scratch — reassessing every parcel in the state against July 1, 2023 market values.

The result is a dramatically restructured tax landscape that every investor buying in Delaware right now needs to understand. The old rates are gone. The new ones look completely different, and where the burden lands has shifted in ways that aren't obvious from a headline number.

Why the Reassessment Happened

The 2018 civil rights lawsuit Delawareans for Educational Opportunity v. Carney exposed what had quietly been distorting property taxes for decades: because assessed values were frozen in time, properties that had appreciated substantially were significantly undertaxed relative to their actual value, while others bore a disproportionate burden. Public school funding tied to property taxes grew increasingly inequitable.

The Court of Chancery agreed. By May 2020, the ruling was clear — the state's True Value Statute and the Uniformity Clause required all property owners to be taxed on an equal footing based on current market value.

Delaware law also caps post-reassessment revenue collection at the macro level, requiring counties to remain effectively revenue neutral. That meant as assessed values skyrocketed to reflect 2023 reality, the actual tax rates had to be slashed in proportion. The math worked out. But where the burden landed at the individual property level shifted considerably.

New Castle County: Bifurcated Rates for FY 2026

New Castle County is the most complex of the three because the Delaware General Assembly authorized bifurcated tax rates — different rates for residential versus non-residential (investment) properties. This is a direct consequence of House Bill 242, passed to shield homeowners from sharp increases while maintaining revenue.

For investors, the non-residential rate is meaningfully higher:

These are county-only rates. Incorporated municipalities layer their own additional local taxes on top, so a property in the City of Wilmington or Newark carries county rates plus city rates. When you are underwriting a Wilmington duplex, you are stacking multiple jurisdictional levies, not just applying one rate.

Kent County: Unified Rate for FY 2026

Kent County implemented its reassessment one year earlier than Sussex, settling on a unified county rate of $0.0572 per $100 of assessed value — no bifurcation between residential and non-residential. That rate is then combined with local school district taxes, which vary considerably by district:

The Capital school district, which covers most of Dover, carries the heaviest combined burden. For investors targeting Dover workforce housing near the state capital or Dover Air Force Base, that $0.5928 per $100 total rate matters in your NOI model. Minor library and vocational-technical levies add slightly more; school capitation taxes are excluded from these figures.

Sussex County: Low Rates Even After Reassessment

Sussex County completed its reassessment for FY 2026 with an exceptionally low county tax rate of $0.0191 per $100, supplemented by a library tax of $0.0023. School district rates vary:

A $500,000 coastal property in the Cape Henlopen district — covering Lewes, Rehoboth Beach, and Dewey Beach — carries a total annual property tax burden of roughly $1,056. That is the figure investors crossing over from New Jersey or Pennsylvania find hard to believe until they see the actual bill. Flat capitation taxes are additional but minimal.

What "Revenue Neutral" Really Means at the Individual Level

The reassessment was designed to be revenue neutral in aggregate — counties were not supposed to collect more total tax after reassessment than before. But revenue neutrality at the macro level does not mean your specific property's taxes stayed flat.

In New Castle County, the primary shift pushed significant burden away from older commercial properties and onto residential homes — which is partly why the bifurcated rates (higher for non-residential investment properties) were introduced as a counterweight. Urban row homes in Wilmington that were severely underassessed on 1983 values saw sharp increases in assessed value, sometimes even with lower effective rates.

For investors purchasing in this environment, the practical takeaway is that you should never rely on a prior owner's tax bill to project your holding costs. Always pull the current assessed value, apply the applicable FY 2026 rate for your county and school district, and build that forward into your cash flow model.

Delaware's Tax Advantage Still Holds

Even after reassessment, Delaware's effective property tax burden averages approximately 0.54% statewide — well below the national average and dramatically below neighboring states. The arbitrage opportunity from Pennsylvania (statewide average 1.58%, with some eastern counties near 4.73%) and New Jersey (average 2.47%) remains substantial. Delaware's low property taxes are a structural feature of the market, not a temporary anomaly.

That structural advantage is one of the core reasons investors from the Philadelphia metro, southern Jersey, and Maryland consistently target Delaware for buy-and-hold acquisitions. The holding costs are genuinely lower, and post-reassessment, the math is now operating on accurate valuations for the first time in decades.

For investors who want the complete county-by-county rate tables, historical context, and worked examples of how to model holding costs under FY 2026 rates, the Delaware Investment Property Guide covers all three counties with scenario-based worksheets.

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