Delaware Property Tax Reassessment: What Heirs and Executors Need to Know

Inheriting real estate in Delaware carries a tax question most families don't anticipate: will the property taxes go up? The answer is more complicated than a simple yes or no — and it has changed significantly in recent years. A 2020 Court of Chancery ruling set off a chain of county-level reassessments that is still reshaping property tax bills across the state. If you're an executor or heir dealing with inherited Delaware property right now, you need to understand both the inheritance rules and this broader reassessment context.

Delaware Does Not Automatically Reassess for Inheritance

Let's start with the good news. Delaware does not trigger an automatic property tax reassessment simply because a home transfers through inheritance or probate. When you inherit a house through a Delaware estate — whether via formal probate, a Transfer-on-Death deed, or joint tenancy — the county assessor does not revalue the property solely because of the transfer event.

This is a meaningful benefit. In some other states, a transfer of ownership can reset the assessed value to current market value, which can cause annual property tax bills to spike dramatically. Delaware does not have that mechanism.

So if the decedent's home was assessed at $180,000 and the property taxes reflected that value, the heir who takes title starts with the same $180,000 assessed basis — assuming no county-wide reassessment happens to coincide with the inheritance.

That last caveat is doing significant work in 2025 and 2026.

The Court-Ordered Reassessments Changing Everything

In 2020, the Delaware Court of Chancery ruled that the three counties — New Castle, Kent, and Sussex — were operating with property assessments so outdated as to be constitutionally inequitable. The ruling mandated a new round of reassessments and established a requirement for recurring reassessments on a regular cycle going forward.

Each county moved on its own timeline:

New Castle County completed a comprehensive reassessment with values taking effect in recent years. The reassessment brought many properties from decades-old assessed values to current market values, producing bill increases that caught homeowners — including new heirs — off guard.

Kent County and Sussex County have been in various stages of their reassessment processes. The timing means that an heir inheriting a Sussex County beach house or a Kent County farm in 2025 or 2026 may receive the property just as a fresh reassessment is taking effect, even though the inheritance itself did not trigger that reassessment.

The distinction matters legally: the inheritance did not cause the reassessment. But practically, an heir can still end up paying substantially more in property taxes than the decedent paid — not because of the transfer, but because the county has updated its valuations at approximately the same time.

Clearing Title Before Any of This Matters

Before the question of property taxes becomes relevant, the executor has to get the title sorted. Delaware real estate does not automatically re-register in a beneficiary's name just because someone died. There are several mechanisms, each requiring specific filings:

Probate route: The executor files an Inventory (Form 600W) with the county Register of Wills within three months of being granted Letters Testamentary. This inventory lists all real estate and designates the new owners. Once the Register of Wills approves the final accounting and the estate is closed, the Inventory functions as the functional equivalent of a deed transfer in the county records. No separate deed recording is required for property passing through probate this way — but the estate must also file an "Affidavit of No Delaware Estate Tax" (sometimes called the No Estate Tax Affidavit, or NETA) with the Register of Wills, even though Delaware repealed its estate tax in 2018. This $10 filing clears any theoretical state tax lien from the property record.

Transfer-on-Death (TOD) Deed route: Delaware's Uniform Real Property Transfer on Death Act, effective in late 2025, allows property owners to record a TOD Deed during their lifetime that transfers real estate automatically at death, outside of probate. The beneficiary then files an affidavit of survivorship with the county Recorder of Deeds to complete the record. This avoids the Register of Wills closing fee entirely — but the heir still inherits the property subject to all existing mortgages, liens, and tax obligations.

Joint tenancy route: If the decedent and a surviving co-owner held title as joint tenants with right of survivorship, the property passes automatically. The surviving owner files an affidavit with the Recorder of Deeds along with a certified death certificate to clear the record.

Appealing a Reassessment

When a reassessment produces a higher assessed value — whether for an inherited property or any other — there is an appeal process in each county. The deadlines are strict and vary by county, so the timeline for filing an appeal matters.

For New Castle County, assessment appeals go to the Board of Assessment Review. For Sussex County, appeals go to the Sussex County Board of Assessment Review. Kent County has its own analogous process. The key is obtaining the reassessment notice, reviewing it against comparable property sales, and filing within the appeal window — which is typically 60 to 90 days from the notice date.

If you believe the county has overvalued the inherited property relative to what it would sell for in the current market, an appeal is worth pursuing. Companies that specialize in property tax appeals do exist in Delaware, and for higher-value properties the potential annual savings can justify their fees. For more modest properties, self-represented appeals are allowed and reasonably common.

Federal Tax: The Step-Up in Basis Is Separate

Property taxes are an annual state and county obligation. They are entirely separate from the federal capital gains question that arises when an heir eventually sells the inherited property.

Under federal tax law, inherited property receives a step-up in basis to the fair market value at the date of the decedent's death. If the decedent paid $80,000 for a house decades ago and it was worth $350,000 when they died, the heir's cost basis is $350,000 — not $80,000. If the heir sells the property shortly after inheriting it for $355,000, the taxable gain is only $5,000, not $275,000.

This step-up applies regardless of whether a property tax reassessment occurs. The two systems — federal capital gains and Delaware property tax — operate independently. An executor documenting the estate should obtain a formal appraisal or broker price opinion at or near the date of death specifically to establish the step-up in basis for capital gains purposes. This documentation is separate from whatever the county assessor decides to do with annual property valuations.

What Executors Should Do Now

If you are administering a Delaware estate that includes real estate, the immediate action items are:

1. Determine how the property is titled and which transfer mechanism applies — probate inventory, TOD Deed, or joint tenancy survivorship.
2. Obtain a date-of-death valuation from a licensed appraiser or qualified real estate agent. This establishes the step-up in basis and may also be needed for the Register of Wills inventory.
3. File the required documents to clear title. If going through probate, that means the inventory within three months and the NETA affidavit. If using a TOD Deed, it means the survivorship affidavit with the Recorder of Deeds.
4. Review the current county assessed value and compare it to the date-of-death appraisal. If a reassessment is pending or recently completed, note the new assessed value and the appeal deadline.
5. Inform the beneficiary inheriting the property of their new property tax baseline and the county's reassessment schedule so they can budget accordingly.

The Delaware Final Tax & Estate Tax Guide covers the full tax picture for estates — including the NETA affidavit requirements, the federal estate tax thresholds (currently $15,000,000 per individual for 2026), the step-up in basis rules, and the fiduciary income tax obligations that kick in when estate assets generate income during administration.

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