Property tax appeal · New Castle County, DE
Appeal your property taxes in New Castle County, DE.
New Castle County homeowners appeal through Delaware’s system: the county assessment office sets the value and the county Board of Assessment Review hears the case. Boards act on evidence of market value as of the assessment date, and a licensed, USPAP-compliant appraisal is that evidence.
$5, credited toward your appraisal.
New Castle County, DE
Home to Wilmington
- Filing deadline
- On your notice
- Valuation date
- January 1
- Values your home
- County assessment office
- Hears your case
- County Board of Assessment Review
- Desktop appraisal
- $225
- $5 check credited
- Timing
- Confirmed with your order
Deadline
Appeal deadlines are set county-by-county in Delaware’s three counties — your reassessment notice states yours. Your assessment notice states the exact date.
Confirm your filing window and recipient requirements before ordering. Service availability and delivery depend on the property, evidence and appraiser. You remain responsible for filing on time.
How it works
How to appeal your property taxes in New Castle County.
- Step 1
Check your savings
Enter your address and pay $5. We check your New Castle County assessment against recent nearby sales.
- Step 2
Order the appraisal
A desktop appraisal valued as of your assessment date, with the $5 credited. Complex homes get one exact quote.
- Step 3
Show us your home
Walk through on your phone so the appraiser sees its condition. A desktop appraisal needs no visit.
- Step 4
File your appeal
A state-licensed DE appraiser signs it, with a cover letter and filing steps. You file by your deadline, and the county Board of Assessment Review hears your case.
The evidence
Boards act on value, not frustration.
However Delaware labels the process, the case underneath is the same: show what your home was actually worth on the assessment date. A licensed, USPAP-compliant appraisal, with comparable sales, documented adjustments and a signed opinion of value, is that showing.
What the appraisal gives you
- Valued as of your assessment date, not today
- Comparable sales with adjustments and citations
- Signed by a state-licensed DE appraiser
- A phone walkthrough; a desktop appraisal needs no visit
- Starting search in New Castle County: 3+ comparable sales within ~1 mi, sold within 12 months
Search settings are starting points for the appraiser, not universal filing requirements. The appraiser selects appropriate evidence for the assignment.
Confirm before you file
- The assessment date (January 1) and tax year on your notice
- The recipient: New Castle County Assessor
- The electronic filing format and required official forms
- Appraiser availability and delivery timing, before you order
The process
How Delaware handles appeals.
Delaware has just three counties — New Castle, Kent, and Sussex — and each runs its own assessment office and Board of Assessment Review. After decades of frozen, decades-old base-year values, all three counties recently completed court-ordered general reassessments, putting every property on current market value at once. That kind of mass revaluation is precisely when individual errors are made, so checking the new number is worth it. You appeal by filing with your county’s assessment office and presenting evidence to the Board of Assessment Review.
Worth knowing in Delaware
School taxes make up the bulk of a Delaware property tax bill, so an assessment cut flows through several taxing lines at once. The review board’s question is your home’s market value on the county’s valuation date — documented comparable sales, the substance of a licensed appraisal, are what it can act on.
FAQ
New Castle County questions
When is the New Castle County appeal deadline?
Appeal deadlines are set county-by-county in Delaware’s three counties — your reassessment notice states yours. Confirm your exact filing window using the assessment notice and official authority.
How do appeals work in New Castle County?
Delaware has just three counties — New Castle, Kent, and Sussex — and each runs its own assessment office and Board of Assessment Review. After decades of frozen, decades-old base-year values, all three counties recently completed court-ordered general reassessments, putting every property on current market value at once. That kind of mass revaluation is precisely when individual errors are made, so checking the new number is worth it. You appeal by filing with your county’s assessment office and presenting evidence to the Board of Assessment Review.
What evidence should I bring?
Comparable sales as of the assessment date, adjusted for the differences between those homes and yours — potential supporting evidence. Check the reviewing authority’s rules for admissibility, valuation date, forms and filing. An appraisal does not guarantee a reduction.
See if an appeal is worth it.
$5, credited toward your appraisal.