Delaware Property Tax Appeal Guides
Browse source-reviewed property tax appeal guides for Delaware. County deadlines, filing methods, and available records can differ by county and tax year.
Each published guide identifies the public sources used for its deadline and filing summary. Confirm current requirements with the official filing authority before submitting anything.
New Castle County: 2026 deadline guidance is 2026 annual assessment appeal deadline was March 14. Guide: https://fairpath.app/property-tax-appeal/delaware/new-castle-county
Source: Delaware General Assembly, Delaware Code Title 9 Chapter 83, https://delcode.delaware.gov/title9/c083/sc01/. Reviewed 2026-08-06.
Source: New Castle County, 2026 Formal Property Assessment Appeal Guide, https://www.newcastlede.gov/DocumentCenter/View/62987/NCC---Guide-to-Property-Assessment-Appeals. Reviewed 2026-08-06.
Source: New Castle County, Assessment Division and Parcel Search, https://www.newcastlede.gov/181/Assessment. Reviewed 2026-08-06.
Source: New Castle County, Board of Assessment Review, https://www.newcastlede.gov/390/Board-of-Assessment-Review. Reviewed 2026-08-06.
Source: New Castle County Office of Finance, 2026-2027 Annual Assessment Legal Notice, https://www.newcastlede.gov/DocumentCenter/View/26129/Legal-Notice. Reviewed 2026-08-06.
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