New Castle County, DE Property Taxes (2026)

New Castle County owners pay a median of $2,444 a year on a median home value of $329,800, an effective rate of 0.74%. That's the 1st-highest rate of 3 Delaware counties with Census data, above the Delaware county median of 0.46%.

Updated October 2026 · Data: U.S. Census Bureau, American Community Survey 5-Year Estimates (2019–2023)

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Effective tax rate

0.74%

1st highest of 3 in DE

Median annual bill

$2,444

~$204/month

Median home value

$329,800

Delaware county median

0.46%

Effective rate

What a protest could save you in New Castle County

Enter the market value from your appraisal notice. We apply New Castle County's 0.74% effective rate and a 10–15% reduction, the typical range for successful protests.

$
Est. annual tax
$2,441
Savings at 10–15% off
$244–$366
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New Castle County vs. Delaware vs. U.S. property tax rates

New Castle County0.74%
Delaware county median0.46%
U.S. county median0.84%

Key stat: New Castle County's effective property tax rate is 0.74%, vs. 0.46% for the median Delaware county and 0.84% for the median U.S. county. It ranks 1st of 3 in Delaware. Effective rate = median tax bill ÷ median home value, so it already reflects typical exemptions. (Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2019–2023))

How to appeal your property taxes in New Castle County

  1. 1

    Review your assessment notice

    Check the assessed value from the New Castle County Assessment Office. Compare it to recent sales of similar homes nearby.

  2. 2

    File your appeal before the deadline

    The New Castle County deadline is Varies by county. Missing it means waiting until the next assessment year.

  3. 3

    Gather evidence

    Recent comparable sales, photos of condition issues, repair estimates or an independent appraisal.

  4. 4

    Present your case

    Submit evidence or attend a hearing with the County Assessment Office.

  5. 5

    Get your decision

    If you win, your assessed value and bill go down. On a $2,444 bill, 10–15% off is $244–$367 a year.

Want help with it?

TaxDrop builds your case from comparable sales data.

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Property tax exemptions in Delaware

Delaware homeowners may qualify for exemptions that reduce taxable value. Check with the New Castle County Assessment Office for amounts.

Homestead exemption

For your primary residence. Reduces the value used to calculate your bill.

Senior / over-65

Many states add an exemption or freeze for owners 65 and older.

Disability

For homeowners with qualifying disabilities, often similar to the over-65 benefit.

Veterans

Disabled veterans may get partial or full exemptions depending on rating.

Frequently Asked Questions

What is the property tax rate in New Castle County, Delaware?
The median effective property tax rate in New Castle County is 0.74%: a median annual bill of $2,444 on a median home value of $329,800. That's the 1st-highest rate of 3 Delaware counties with Census data. Your own rate depends on which city, school district and special districts you're in. Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2019–2023).
How much are property taxes in New Castle County?
The median New Castle County property tax bill is $2,444 a year, about $204 a month, compared with a Delaware county median of $1,331.
What is the deadline to appeal property taxes in New Castle County?
The deadline to appeal in New Castle County is Varies by county. Missing it means waiting until the next assessment cycle.
Is New Castle County a high property tax area?
New Castle County's 0.74% effective rate is above the Delaware county median of 0.46% and below the U.S. county median of 0.84%. That's the 1st-highest rate of 3 Delaware counties with Census data.
Can TaxDrop help lower my New Castle County property taxes?
TaxDrop analyzes your property against local comparable sales and helps you appeal your assessment.

Property taxes in nearby counties

Kent County

Rate: 0.46%

Median bill: $1,331

Sussex County

Rate: 0.33%

Median bill: $1,171

← All 3 Delaware counties

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