Pay county property and school taxes by September 30. Delaware counties bill county and school property taxes together, normally due September 30 with penalties added each month after the due date, so check the date printed on your bill, since the General Assembly can move it (it moved New Castle County's 2025 and 2026 bills to December 31 during the county's reassessment).
The Delaware rule
Each rule shows its schedule, its primary sources, and the date it was last verified.
Related rules in Delaware
The Delaware guide lists every compliance obligation, the seasonal maintenance calendar, and baseline upkeep.
Open the Delaware landlord guide · Property tax deadlines in every state
What Landautomate does with this page
This guide is the reading version of the Landautomate Delaware rule base. In the app, the same rules become dated tasks on each Delaware property, timed to its purchase date, lease dates, age, and climate, with an email before each one is due. The free preview shows a sample of that schedule for Delaware in under a minute, no account needed.
See this calendar built for your own property
The free preview takes a state and a few property facts and shows the schedule Landautomate would run, no account needed. Every new account starts with a 30-day free Pro trial, no card required.