Property-tax appeals in Delaware
Deadlines, evidence, and a packet you file yourself — for homes, multifamily, and commercial property in Delaware.
State rules verified from public sources| Deadline rule | Deadlines are county-set - there is no single statewide date. New Castle County: file written notice of appeal with the Board prior to March 15 (9 Del. C. 8311(a)), and the county Board of Assessment Review's current rules accept annual appeal forms from January 1 up to March 15. Check your own county's published notice for its window |
|---|---|
| First hearing body | County Board of Assessment Review (one board for each county: New Castle, Kent and Sussex); further appeal to the Superior Court |
New Castle County's Board of Assessment Review is authorised under 9 Del. C. 1371A and appeals must be submitted on the Board's official form (Board Rules of Procedure, effective August 26, 2026). Under 9 Del. C. 8311 as published, the Kent County board sits April 1-15 and the Sussex County board February 15-March 1 to hear appeals; counties publish their filing instructions annually, and your county's notice controls the exact dates. No filing fee was stated in the sources checked.
What wins in Delaware
Homes are argued on comparable sales and uniformity. Income property is argued on the income approach — rent roll, expenses, and a supported cap rate. The packet builds the argument that matches your property type, with your evidence organised as exhibits.
Segments: Residential · Multifamily · Commercial · Pricing
Largest counties in Delaware
New Castle County · Sussex County · Kent County
General information from public sources, not legal advice. Software, not representation. FairAppealPacket is not a law firm, a licensed appraiser, or a licensed property-tax consultant. We do not file, appear, or negotiate for you. You review, sign, and file your own appeal. No result is guaranteed.
See what your deadline and your numbers say
The check is free and uses your own numbers — no score invented from data we do not have. If your worksheet shows no indicated saving, we will tell you not to buy a packet.