New Castle County, DelawareProperty records & tax offices
Links open the listed public-office or service-provider website in a new tab. This directory does not collect payments.
Find the right property record
Use the property portal for ownership and assessed value, the collector for a bill or balance, and the map for parcel location. Have the address, owner name, or parcel number ready.
Tax bills & filing dates
These are the dates and qualifications recorded in the directory. Confirm your tax year and current deadline with the official office and your property’s notice.
- Tax bill mailing
- Week of July 21, 2026 for the current billing cycle; New Castle County announced that 2026 tax bills would be mailed that week and uploaded to Parcel Search.
- Payment deadline
- December 31, 2026 for 2026 property-tax bills; New Castle County extended the traditional September 30 deadline because of its reassessment quality-control review.
- Assessment appeal
- January 1 through March 14, 2027 for the 2027 annual assessment appeal; New Castle County's Board of Assessment Review publishes this filing window.
- Rate information
- Approximately 0.1846% for the FY2027 unincorporated residential county rate, derived from the official FY2026 rate of $0.1575 per $100 and the approved FY2027 17.2% increase; municipal, school, and non-residential rates vary.
Exemptions & appeals
View exemption application (opens in a new tab)Exemption filing
June 1, 2026 for the New Castle County elderly exemption; the 2026 application states applicants age 65+ before July 1, 2026 must file by June 1.
Senior relief
New Castle County's 2026 elderly exemption generally requires age 65+ before July 1, 2026, a principal residence, assessed value no higher than $676,000, household AGI no higher than $65,000 excluding Social Security/Tier 1 Railroad benefits, ten consecutive years of Delaware domicile, and no delinquent county taxes or sewer charges. The county exemption subtracts up to $173,000 from assessed value; a separate state $5,000 exemption can apply to very-low-income residents.
Valuation limits
No individual homestead assessment-growth cap was published; Delaware law and New Castle County's reassessment process constrain county revenue growth, while municipal and school charges vary separately.
For a valuation appeal, use the appeal date in the tax and filing section above. Keep your notice, supporting evidence, and proof of submission.
More exemption & appeal guidance →