How New Jersey Property Taxes Work (and How to Appeal)

New Jersey has the highest property taxes in the country, so it is worth understanding how yours are calculated, where the money goes, and what to do if you think your assessment is too high. Here is a plain-English guide for Trenton and Mercer County homeowners.

How your bill is calculated

Your property tax bill starts with an assessment, the local tax assessor’s estimate of your property’s value as of October 1 of the prior year. That assessed value is multiplied by the local tax rate to produce your bill, which is generally paid in four quarterly installments. An assessment is an opinion of value, and opinions can be wrong.

Where the money goes

Property taxes are the main way local government is funded in New Jersey. Your bill is split among three buckets: the municipal budget that City Council approves, the county budget, and, usually the largest share, the local schools. That is why following the budget process matters; our guide on how to follow Trenton City Council shows where those decisions get made.

How to read your assessment

Around late January, property owners receive an assessment postcard listing the year’s assessed value. Compare it with what similar homes near you have recently sold for. If your assessment implies a market value well above what comparable homes are fetching, you may be over-assessed. The state uses a formula, known as Chapter 123, that generally requires showing your property is more than 15 percent over-assessed to win a reduction.

How to appeal

If the numbers look off, you can appeal:

• File a Petition of Appeal (Form A-1) with the Mercer County Board of Taxation, or online through the state’s appeal portal.
• The deadline is generally April 1 of the tax year, or May 1 in a year your town does a revaluation or reassessment. The filing must be received by the deadline, not just postmarked.
• Bring evidence. Recent sales of comparable properties are the strongest proof of market value.
• Properties assessed above $1 million may file directly with the Tax Court of New Jersey. If you disagree with the county board’s decision, you can appeal to the Tax Court within 45 days.

The New Jersey Division of Taxation publishes the rules, and appeals can be filed through the state’s online appeals portal. If you need underlying records to build your case, our guide on filing an OPRA request can help.

Relief programs worth knowing

New Jersey offers several property tax relief programs, including ANCHOR, the Senior Freeze, and deductions for eligible seniors, disabled residents, and veterans. Eligibility and funding change year to year, so check the Division of Taxation for current details.

Frequently asked questions

When is the deadline to appeal property taxes in New Jersey?

Generally April 1 of the tax year, or May 1 in a municipal revaluation or reassessment year. The appeal must be received by the deadline.

Where do my property taxes go?

They fund three local budgets: the municipality, the county, and the local schools, which usually take the largest share.

How do I know if I am over-assessed?

Compare your assessment to recent sales of similar homes nearby. New Jersey’s Chapter 123 formula generally requires showing you are more than 15 percent over-assessed to win a reduction.

We cover development, jobs, and the local economy in our Business section. This is general information, not tax or legal advice.