New Castle County has Delaware’s highest property tax rate at approximately 0.75%. It is still dramatically lower than New Jersey, New York, Connecticut, or Pennsylvania. Here is the complete picture — in plain dollars, not percentages — so you can make an honest comparison.
| Purchase Price | Annual NCC Tax (0.75%) | Monthly NCC Tax |
|---|---|---|
| $350,000 | ~$2,625/yr | ~$219/mo |
| $450,000 | ~$3,375/yr | ~$281/mo |
| $550,000 | ~$4,125/yr | ~$344/mo |
| $650,000 | ~$4,875/yr | ~$406/mo |
| County | Rate | Tax on $500K Home | Monthly | Annual Gap vs NCC |
|---|---|---|---|---|
| New Castle County | ~0.75% | ~$3,750/yr | ~$313/mo | Baseline |
| Kent County | ~0.47% | ~$2,350/yr | ~$196/mo | Save ~$1,400/yr |
| Sussex County | ~0.43–0.56% | ~$2,150–$2,800/yr | ~$179–$233/mo | Save ~$950–$1,600/yr |
New Castle County is Delaware’s most expensive county for property taxes. It is still among the most tax-advantaged retirement addresses in the Mid-Atlantic. Buyers who need to choose between Delaware counties should understand the ~$1,400/year inter-county gap and decide whether the I-95 location premium is worth it for their retirement lifestyle. For buyers who will rarely or never use Philadelphia infrastructure, Kent County or Sussex coastal delivers the same income tax advantages at a lower property tax rate and lower purchase price.
The county choice is a $1,400–$2,000/year decision. We can help you model all three counties for your specific situation.
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