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Old Westbury, Nassau County, New York Property Taxes

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Property Taxes in Old Westbury, New York

  • Median Old Westbury, New York effective property tax rate: 0.18%, significantly lower than the national median of 1.02%, and lower than the New York state median of 1.90%.

  • Median Old Westbury, New York home value: $1,764,000

  • Median annual Old Westbury, New York tax bill: $3,303, $903 higher than the national median property tax bill of $2,400.

How are property taxes in Nassau calculated?

Property taxes in Old Westbury, New York are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.

Understanding Old Westbury's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Old Westbury, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

Old Westbury, Nassau County, New York Property Tax Bill Calculator

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

0.18%

Estimate Property Tax Bill

$3,175

$2,946

SAVE WITH OWNWELL

$774

Average Annual Tax Savings

How Does the Old Westbury Property Tax Calculator Work?

Use this Old Westbury property tax calculator to estimate your annual tax bill. Enter your property's assessed value and our calculator applies Old Westbury's median effective tax rate of 0.18% — based on actual property records in Nassau County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local assessment district uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Old Westbury's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.

Your bill may vary by ZIP code within Old Westbury: rates range from 0.18% in 11568 to 0.18% in 11568, primarily due to differences in school district levies and local assessment districts.

If your estimate is higher than expected, Ownwell can appeal your Old Westbury assessment — you only pay if we save you money.

About Old Westbury Property Taxes

About Property Taxes in Old Westbury, Nassau, New York

Old Westbury's median effective property tax rate of 0.18% is lower than the New York state median of 1.90% and lower than the national median of 1.02%. This rate reflects the Nassau County base levy combined with local school district levies and special district levies that vary by subdivision throughout the city.

Property tax rates are not uniform across Old Westbury. Homeowners in the 11568 ZIP code carry a median effective rate of 0.18%, while those in the same ZIP also pay 0.18%. This spread reflects how school district boundaries and local assessment districts are drawn across Nassau County. Understanding which part of Old Westbury you live in can make a meaningful difference to your annual tax bill.

Old Westbury homeowners who believe their assessed value is too high can file a formal appeal with the local Assessment Review Commission before the March 31, 2026 deadline each year.

If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.

Property Tax Rates Across Old Westbury, Nassau County, New York

As noted earlier, local government entities set tax rates, which can vary widely within a state.

Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.

While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.

Below, you can compare Old Westbury's effective property tax rate to other cities in New York and the median property tax rates in New York and the U.S.

Property Tax Rates Across Old Westbury, Nassau County, New York

Source: Ownwell

0.18%

0.61%

1.04%

Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.

Median Effective Old Westbury Tax Rate

0.18%

Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.

Median Effective Nassau County Tax Rate

0.71%

Median Effective New York Tax Rate

1.90%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Old Westbury, Nassau County, New York

Zip10th Percentile25th PercentileMedian Tax Rate75th Percentile90th Percentile
115680.15%0.17%0.18%0.21%0.24%

Source: Ownwell

Property Tax Assessment Values Across Old Westbury, Nassau County, New York

When examining property taxes in Old Westbury, New York, understanding the distinction between "market value" and "assessed value" is crucial.

The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The Nassau County appraisal district estimates the market value for tax purposes.

The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.

Assessment notices:

In Nassau County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of the month when notices are sent.

Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Old Westbury.

For example, the median home price in Old Westbury is $1,764,000, with tax bills ranging significantly across the county. 11568 has the highest median home price at $1,764,000.

Property Tax Assessment Values Across Old Westbury, Nassau County, New York

Source: Ownwell

$351,000

$2,146,500

$3,942,000

Median Old Westbury Market Value

$1,764,000

Median Nassau County Market Value

$518,000

Median New York Market Value

$312,500

Median United States Market Value

$235,294

Property Tax Assessment Values Across Old Westbury, Nassau County, New York

Zip10th Percentile25th PercentileMedian Home Price75th Percentile90th Percentile
11568$1,094,200$1,341,000$1,764,000$2,345,000$3,320,200

Source: Ownwell

Property Tax Bills Across Old Westbury, Nassau County, New York

Property tax bills in Old Westbury are based on the assessed value of a home and the local tax rate set by taxing authorities in Nassau County. The higher the assessed value, the higher the tax bill can be, which means homeowners with more valuable properties often pay more. In Old Westbury, where the median home price is $1,764,000, property taxes can be a major expense for homeowners.

Tax bills in the area vary widely, with the 25th percentile at $2,438, the 75th percentile at $4,522, and the 90th percentile at $6,876. The median tax bill in the ZIP code 11568 is $3,303, which is above the national median property tax bill of $2,400 and the national median property tax rate of 1.02%. These costs can significantly affect monthly budgets and long-term housing affordability.

Ownwell helps homeowners save by reviewing property tax assessments, identifying opportunities for appeal, and pursuing exemptions when available. By challenging an unfair assessment, Ownwell can help reduce your property tax bill and keep more money in your pocket.

Property Tax Bills Across Old Westbury, Nassau County, New York

Source: Ownwell

$853

$5,263

$9,673

Median Old Westbury Tax Bill

$3,303

Median Nassau County Tax Bill

$3,634

Median New York Tax Bill

$5,420

Median United States Tax Bill

$2,400

Property Tax Bills Across Old Westbury, Nassau County, New York

Zip10th Percentile25th PercentileMedian Tax Bill75th Percentile90th Percentile
11568$1,936$2,438$3,303$4,522$6,876

Source: Ownwell

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Frequently Asked Property Tax Questions in Old Westbury, New York

How are property taxes calculated in Old Westbury, New York?
Property taxes in Old Westbury, New York are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.
How do I appeal my property taxes in Old Westbury, New York?
To appeal your property taxes in Old Westbury, New York, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.
What property tax exemptions are available in Old Westbury, New York?
Common property tax exemptions in Old Westbury, New York include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.
When are property taxes due in Old Westbury, New York?
Property tax deadlines in Old Westbury, New York vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.
How can Ownwell help reduce my property taxes in Old Westbury, New York?
Ownwell provides professional property tax appeal services in Old Westbury, New York. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.