New Castle County Property Tax Appeal Guide
In New Castle County, file your appeal by County-set window keyed to the assessment notice. New Castle County: written notice of appeal must be filed prior to March 15 (9 Del. C. §8311(a)). Kent and Sussex Counties: the Board of Assessment Review hears appeals from March 1 to May 31 each year, or until all appeals are heard during a reassessment year (9 Del. C. §8311(b), (c)). All three counties completed their first general reassessment in roughly 40 years effective fiscal year 2025; reassessment-year appeal windows ran off the new tentative-assessment notices and varied by county. at New Castle County Office of Assessment's online portal.
| Deadline | County-set window keyed to the assessment notice. New Castle County: written notice of appeal must be filed prior to March 15 (9 Del. C. §8311(a)). Kent and Sussex Counties: the Board of Assessment Review hears appeals from March 1 to May 31 each year, or until all appeals are heard during a reassessment year (9 Del. C. §8311(b), (c)). All three counties completed their first general reassessment in roughly 40 years effective fiscal year 2025; reassessment-year appeal windows ran off the new tentative-assessment notices and varied by county. |
|---|---|
| Lien date | July 1, 2024 |
| Appeal body | Board of Assessment Review (BAR) |
| Assessor / district | New Castle County Office of Assessment |
| Online portal | File online |
How to File a Appeal in New Castle County
- Gather your assessment notice — it lists your account number and any access code
- File online through New Castle County Office of Assessment's portal or by mail
- State your grounds and submit evidence (comparable sales, a licensed appraisal, or photos of defects)
- Request an informal review to try to settle before a formal BAR hearing