New Jersey Property Tax Appeal Calculator
If your property's assessed value is higher than its current market value, you may be overpaying property taxes. Enter your county, assessed value, and an estimated market value below to see how much a successful appeal could save you each year.
Estimate your over-assessment
From your latest tax assessment notice
Recent sale of your home or comparable properties
Estimates are for planning purposes only. Actual savings depend on the outcome of your appeal, exemptions, and local levy decisions. Not legal or tax advice.
How property tax appeals work in New Jersey
In New Jersey, property owners can appeal their assessment to the county board of taxation by filing Form A-1. If the county decision is unsatisfactory, further appeal to the New Jersey Tax Court is available. The appeal process is separate from applying for exemptions or abatements.
Filing deadline
The annual filing deadline is typically April 1 of the tax year, or 45 days from the date the assessment notice was mailed — whichever is later. Deadlines shift in revaluation years; confirm the current deadline with your county board.
Documents typically needed
- Completed Form A-1 (Petition of Appeal)
- Recent comparable sales (comps) supporting your estimated market value
- Independent appraisal (strongly recommended for appeals over $150K difference)
- Photos of the property showing condition or defects
Tips for a stronger appeal
- Pull recent sales of comparable homes in your neighborhood from Zillow or the county assessor site — comps are the strongest evidence.
- Your assessed value should reflect market value as of October 1 of the pre-tax year, not the current date.
- Even a small rate reduction compounds over years — a $5,000 assessment cut saves roughly the effective rate × $5,000 every year.
- Third-party services like Ownwell handle the filing and comps research on your behalf, typically for a percentage of the first-year savings.
New Jersey property tax appeal — frequently asked questions
What is a property tax appeal in New Jersey?
A property tax appeal is a formal request to have your property's assessed value reviewed and potentially lowered. In New Jersey, assessments are used to calculate your annual property tax bill — if your assessed value is higher than your home's actual market value, you may be paying more than you should. Filing an appeal with the County Board of Taxation allows you to challenge the assessment using comparable sales and other evidence.
How do I know if I'm over-assessed in New Jersey?
Compare your assessed value (shown on your tax bill or assessment notice) to recent sale prices of similar homes in your neighborhood. If your assessed value is materially higher than what comparable homes have sold for, you may be over-assessed. The calculator above estimates your potential overpayment using your county's current effective tax rate.
How much can I save by appealing my property taxes in NJ?
Savings depend on the size of the over-assessment and your county's tax rate. For example, if your property is assessed $50,000 above market value and your county's effective rate is 2%, a successful appeal could save approximately $1,000 per year. Use the calculator above to estimate your specific situation. Savings persist year over year as long as the lower assessment holds.
What is the deadline to appeal property taxes in New Jersey?
The annual filing deadline is typically April 1 of the tax year, or 45 days from the date the assessment notice was mailed — whichever is later. Deadlines shift in revaluation years; confirm the current deadline with your county board.
What documents do I need to appeal my property taxes in New Jersey?
The most important evidence is comparable recent sales (comps) of similar properties in your neighborhood. You will also need: Completed Form A-1 (Petition of Appeal); Recent comparable sales (comps) supporting your estimated market value; Independent appraisal (strongly recommended for appeals over $150K difference); Photos of the property showing condition or defects. The stronger your comparables, the better your chances of a successful appeal.
Who hears property tax appeals in New Jersey?
In New Jersey, assessment appeals are heard by the County Board of Taxation. You can represent yourself or hire a property tax attorney or a third-party appeal service. If you disagree with the board's decision, further appeal to the state tax court is typically available.
What happens after a successful property tax appeal in New Jersey?
If your appeal succeeds, your assessed value is reduced to the approved amount. Your annual tax bill is then recalculated using the new lower assessed value and the applicable tax rate. The reduction generally applies to the tax year in which you filed; future years are not automatically adjusted, but the lower assessment often carries forward unless the assessor revalues your property.
Can I use a service to appeal my property taxes instead of doing it myself?
Yes. Third-party appeal services like Ownwell handle the research, paperwork, and hearing on your behalf. They typically charge a percentage of the first year's savings — if they don't save you money, you pay nothing. This can be a practical option if you don't have time to pull comparables and prepare a case yourself.
Related tools
Estimates are for planning purposes only. Actual appeal outcomes and tax savings depend on comparable sales evidence, the board's decision, exemptions, and local levy rates. This is not legal or tax advice. Methodology.