Delaware Property Tax Due Dates by County: New Castle, Kent and Sussex
New Castle County moved its 2026 property tax due date to December 31. Kent and Sussex stayed at September 30. Here's how each county's dates and late penalties work.
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New Castle County Appeals: Received by 4 p.m. on March 14
New Castle County annual assessment appeals must be received by 4:00 p.m. on March 14. A postmark does not save a late form. Kent and Sussex sitting dates are not treated as a filing deadline.
Delaware Realty Transfer Tax: 2.5 Percent State and 1.5 Percent Local
Where a Delaware locality enacted the full local realty transfer tax, the state share is 2.5 percent and the local share is 1.5 percent. The total is 4 percent. The first-time buyer reduction hits only the buyer's half.
Delaware Seller Disclosure: Known Defects, No Revocation Clock
Delaware sellers disclose known material defects in writing, and buyers receive the condition report before they offer. The form is not a warranty. These sections do not give a cancellation period in days.
Delaware Senior School-Tax Credit: 50 Percent, Capped at $500
Delaware homeowners age 65 or over can receive a school-tax credit of 50 percent, up to $500, on a primary residence. Apply by April 30. The year's bill must be paid in full.
Delaware Supplemental Assessments: Appeal Within 30 Days
A Delaware supplemental assessment may be appealed within 30 days from the date notice is sent. A reduction brings a refund plus 1 percent interest per month. This is not the March 14 annual appeal.
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