Property tax deadlines in Delaware

All 3 Delaware counties and county equivalents. 1 have been checked against the county's own schedule; the rest follow the state schedule below.

Delaware statutory schedule

Instalment	Due	Notes
Annual - Kent	June 2, 2027	Annual bill in Kent County; penalties start September 30.
Annual - New Castle and Sussex	July 2, 2027	Annual bill in New Castle and Sussex; New Castle penalties start September 1, Sussex penalties September 30.

delcode.delaware.gov After the county penalty date (September 1 in New Castle, September 30 in Kent and Sussex), monthly penalties accrue: 6% plus 1% per month in New Castle and 1.5% per month in Kent and Sussex.

Counties

Kent County Statewide schedule · Jun 2, 2027 New Castle County Verified · next due Dec 31, 2026 Sussex County Statewide schedule · Jun 2, 2027

About Delaware property tax

Delaware property tax is billed and collected county by county, so the collector — not the state — issues the bill. The statute itself sets different dates by county: Kent is due June 1, New Castle and Sussex July 1, with penalties starting September 1 versus September 30.

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CountyTaxDates is an independent reference and is not a government agency. Deadlines change and exceptions apply — always confirm with your county treasurer using the official link on this page. Nothing here is tax, legal or financial advice.