The short answer is no. Reducing your property’s Assessment Value does not reduce your home’s Market Value.

• Assessment Value is the value assigned to your property by the local assessor for property tax purposes.
• Market Value is the amount a buyer would likely pay for your home on the open market.

These are two different values that serve two different purposes.

Why Homeowners Get Confused?

Many Nassau and Suffolk County homeowners assume that if their Assessment Value goes down, their home’s Market Value must go down as well.

This is a common misconception because both values are associated with the same property. However, an Assessment Value is used to calculate property taxes, while Market Value is determined by what buyers are willing to pay.

A Simple Example

Imagine two identical homes on the same street.

• Home A has an assessment that is too high.
• Home B has a fair and accurate assessment.

If Home A successfully receives a property tax reduction, both homes could still sell for exactly the same price.
That’s because buyers care about factors such as location, condition, size, school district, and market demand, not the Assessment Value used to calculate property taxes.

In fact, lower property taxes can make a home more attractive to buyers because they reduce the overall cost of ownership.

What a Property Tax Grievance Actually Does?

Obtaining a reduction in your property’s Assessment Value does not decrease your home’s Market Value.

Your home’s Market Value is determined by the real estate market. Your Assessment Value is used by the county to calculate property taxes.
They are separate concepts that serve different purposes.

If your property is over-assessed, filing a Property Tax Grievance may help lower your property taxes without affecting the value of your home.

The Bottom Line

Obtaining a reduction in your property’s Assessment Value does not decrease your home’s Market Value.
Your home’s Market Value is determined by the real estate market. Your Assessment Value is used by the county to calculate property taxes.
They are separate concepts that serve different purposes.
If your property is over-assessed, filing a Property Tax Grievance may help lower your property taxes without affecting the value of your home.

Have Questions?
If you’re unsure whether your property may be over-assessed, contact ZapMyTax today (516) 889 5500 or via email clientservices@zapmytax.com  
Our experienced team can review your property and answer your questions.

Interested in learning more about Property Tax Grievances? Explore other related articles on our blog. https://zapmytaxnews.com/2026/06/22/assessed-value-vs-market-value-whats-the-difference/