County Housing Costs

Property tax on a $450,000 home in New Castle County, DE

Official source data 2024

On a $450,000 home in New Castle County

$3,193

estimated annual property tax

$266monthly budget
0.71%county effective rate

ACS 2020-2024 ratio of medians. This estimate does not use your parcel’s assessment or district tax rates.

Make it your number.

New Castle County, Delaware

Your actual bill depends on your local assessment, exemptions, and taxing districts.

A home value. A yearly budget.

These scenarios use the same 0.71% effective rate. They do not predict an individual tax assessment.

Property tax scenarios in New Castle County
Home valueAnnual estimateMonthly budget
$100,000$710$59
$150,000$1,064$89
$200,000$1,419$118
$250,000$1,774$148
$300,000$2,129$177
$350,000$2,483$207
$400,000$2,838$237
$450,000$3,193$266
$500,000$3,548$296
$600,000$4,257$355
$750,000$5,322$443
$1,000,000$7,095$591
$1,250,000$8,869$739
$1,500,000$10,643$887
$1,750,000$12,417$1,035
$2,000,000$14,191$1,183

The county context.

Median tax bill$2,499
Median home value$352,200
Rate rank within Delaware1 of 3

Rank runs from highest to lowest among counties with usable ACS medians. County medians may describe different households and cannot replace parcel-level figures.

Neighboring counties

Same home value in neighboring counties
CountyEffective rateSame-value estimateMedian tax paid
Delaware County, PA1.84%$8,296$6,124
Chester County, PA1.30%$5,846$6,308
Gloucester County, NJ2.60%$11,678$8,055
Kent County, DE0.43%$1,937$1,363

Up to four adjacent counties with usable ACS medians, ordered by population. The 2026 Census adjacency file includes point contacts and boundaries in water.

What can change your bill?

The ACS effective rate is a ratio of medians, not a statutory rate. Local assessed values, levies, classification, caps and exemptions determine the actual bill.

Exemptions & assessment

No uniform flat exemption is applied. Enter your assessor-provided assessment ratio and qualifying exemption for a separate statutory scenario.

Payment dates & appeals

County and municipal bills have their own calendars. Kent County's annual county/school bill is due September 30; this county example does not establish a deadline for every Delaware bill.

Kent County's ordinary annual appeal must be received by its January deadline, normally January 31 at 5 p.m.; supplemental increases use a 30-day notice period. Reassessment-year deadlines can differ. Check your county.

Check Delaware’s official property-tax guidance

Use an assessed value, exemption, and local millage

This separate scenario needs your assessor’s inputs. An exemption applies only to eligible levies; do not apply it to the county’s historical effective rate.

1 mill = $1 per $1,000 of taxable assessed value.

Good questions. Clear answers.

How much is property tax on a $450,000 home in New Castle County?

The historical effective-rate estimate is $3,193 per year, or $266 a month. It multiplies $450,000 by 0.71%.

Is the effective rate the rate on my tax bill?

No. It is median real-estate taxes paid divided by median home value in the ACS 2020-2024 survey. Your taxing districts, assessed value, classification and exemptions determine your bill.

Can I subtract a homestead exemption from this estimate?

Use the separate statutory scenario with a qualifying levy. Subtracting an exemption from an ACS effective-rate estimate can double-count relief already reflected in taxes paid.

Does a higher purchase price change my assessment?

Assessment rules and reassessment dates vary by state and locality. Contact the linked official property-tax office before relying on a historical county ratio.

How do I appeal a property-tax assessment?

Read the deadline and procedure on your assessment notice, then use the official state guidance above to locate your assessor or review board. County survey data does not establish your appeal deadline.

Check the source.

Data as of 2024. Retrieved .

Read the assumptions and calculation methods