Delaware property tax rates by county

Apply each county's benchmark rate to a $352,000 home, the Delaware median: about $2,498 a year in New Castle County (0.71%) versus $1,124 in Sussex County (0.32%) — $1,374 a year apart for the same house. Counties with at least 20,000 people.

Find a county in this state

• New Castle CountyMedian home value $352,2000.71%$2,499 / year
• Kent CountyMedian home value $316,6000.43%$1,363 / year
• Sussex CountyMedian home value $382,6000.32%$1,222 / year

Payment dates vary by local tax authority.

Check your city, town or county tax collector for this year's deadline. The statewide notes below are a general guide.

Late penalty	New Castle: 6% penalty on Oct 1 + 1%/month; Kent & Sussex: 1.5% per month (9 Del. C. § 8604)
Appeal window	New Castle County: by March 15; Kent County: by April 15; Sussex County: by February 15 (9 Del. C. § 8311)

county-set; Delaware has 3 counties, all with annual payment due September 30 (delinquent October 1). New Castle adds 6% penalty on Oct 1 plus 1%/month; Kent/Sussex add 1.5%/month. Regular annual schedule; tax year: tax year July 1 - June 30, bills mailed July. Source: 9 Del. C. § 8604, rules checked 2026-09-19. Confirm the amount and deadline on your official tax bill.