How a Nassau County property tax grievance works.

From the tax bill in your mailbox to the county’s answer. Scroll — the whole process plays out below, start to finish.

Nassau County, NY

Every home here pays property tax.

For most families it is the biggest bill of the year.

Your home

Every January the county decides what your home is worth. That number sets your tax.

Your block

Same street, same size, same age. Homes like yours should pay like yours.

Every home in Nassau

Recent sales, home details, tax rates. Hundreds of thousands of homes, measured every year.

The proof

Recent sales of homes like yours, laid out the way the county reviews them.

The filing

The window opens in January and closes in March. We handle all of it.

The decision

It can lower your number or leave it alone. Filing can never raise it.

Back home

Nothing upfront. If we win nothing, you pay nothing.

Next January

A win does not carry over. The county sets a new number every year, and we check it every year.

Start here

We check the assessment and tell you what we find.