2026 Property Tax Due Dates
September 30
Full payment
Payment Methods
Online, Mail, In-Person
New Castle County Treasurer
Phone
(302) 395-5340Office Hours
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to New Castle County Treasurer
In Person
Visit the Treasurer's office — 87 Reads Way, New Castle DE 19720, Mon-Fri 8am - 4pm
About Property Taxes in Delaware
Delaware has three counties — New Castle, Kent, and Sussex — each with its own assessment practices, rates, and schedules. Delaware generally has low property taxes compared to neighboring states, and assessment methods vary significantly by county. New Castle County has not conducted a full countywide reassessment in decades, resulting in assessed values that can differ dramatically from market value. Kent and Sussex counties assess closer to market value. Property taxes in Delaware fund county government, local municipalities, and school districts.
Payment & Assessment
Payment schedules vary by county: New Castle County: Semi-annual billing. First half due September 30, second half due March 31. Kent County: Annual billing, typically due September 30. Sussex County: Annual billing, typically due September 30. School district taxes are billed separately from county taxes in Delaware, with school tax bills generally due in September. Most counties and school districts offer online payment. Contact your county government or school district for payment options. Late fees vary by taxing authority.
Statewide framework for Delaware. Your county's specific rates and deadlines are shown above.
Related Resources
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Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.