AppealDesk

Mercer County Property Tax Appeal, New Jersey

Travis BunnTravis Bunn·Updated July 24, 2026

Mercer County is located in Central New Jersey with Trenton as its county seat and state capital, earning the nickname 'The Capital County.' With a 2026 population of approximately 401,000, Mercer County is the state's 12th-most populous county. Property tax appeals are particularly important in Mercer County due to its significantly high tax burden, the county ranks 17th highest among 3,143 U.S. counties for median property taxes. The median annual property tax bill of $7,344 is substantially higher than the national median of $2,400, and the effective tax rate of 3.30% exceeds both the New Jersey state median of 2.88% and the national median of 1.02%.

Notable cities: Trenton, Princeton, Hamilton Township, Ewing Township, Lawrence Township

Median Home

$309,300

Tax Rate

3.30%

Annual Tax

$7,344

Population

401,249

On the typical Mercer County home, valued near $309,300 at the county’s effective tax rate of 3.30%, an over-assessment of even 10% means you are overpaying year after year until you appeal it. Here is how to find out if yours qualifies.

2026 Appeal Deadline: April 1, 2026, or within 45 days from the date assessment notifications are mailed, whichever is later

This year's appeal window has passed in most of New Jersey. Order now and we re-run your numbers free when the window reopens, so your evidence is ready the day your next notice lands.

Appeals must be filed with the Mercer County Board of Taxation on or before April 1 of the tax year or within 45 days from the date that Assessment Notification postcards are mailed by the municipality, whichever is later. Assessment notices are typically mailed at the end of January each year. If your municipality has undergone a recent revaluation, the deadline may be extended to May 1. For added or omitted assessments, the deadline is December 1 or 30 days from bulk mailing of tax bills, whichever is later.

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Victorian Cape May, New Jersey house. Mercer County appeal guide.

How Mercer County Assesses Property

100%of market value

Assessed by: Municipal Tax Assessors (supervised by Mercer County Board of Taxation)

Assessment cycle: annual

Notices typically mailed: Late January to early February

In Mercer County, properties are assessed at 100% of their true market value, meaning your assessed value equals your property's market value. For example: If your home's market value is $309,300 (the county median), at New Jersey's 100% assessment ratio your assessed value would be $309,300, resulting in approximately $10,207 in annual taxes at the county's effective rate of 3.30%. Unlike some states that use fractional assessment ratios, New Jersey's full-value system means the assessed value on your tax notice should match what your home would sell for on the open market.

The Appeal Process

Appeals are heard by the County Board of Taxation. Tax appeal hearings are held after the April 1 filing deadline during weekdays starting at 9 a.m., and adjournments are generally denied. You must prove your assessment is unreasonable compared to market value by presenting sufficient evidence such as comparable sales, appraisals, or property condition documentation. The Board issues a written judgment after each hearing.

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Step 1: Before filing an appeal, review your Tax Assessment Notice Postcard (mailed in late January) and verify your assessment information is correct. Consider scheduling an informal review with your municipal tax assessor to discuss your concerns, this may resolve the issue without a formal appeal.

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Step 2: Gather evidence to support your appeal, including recent comparable sales (within 12 months) of similar homes in your municipality that sold for less than your assessed value. Match properties by square footage, lot size, age, condition, and location. You may also obtain an independent appraisal, take photos showing property condition issues, or document needed repairs.

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Step 3: Complete the Petition of Appeal form available from the Mercer County Board of Taxation website or office. The form must include one copy served on the Mercer County Board of Taxation, one copy to your Municipal Assessor, and one copy to your Municipal Clerk. File by April 1, 2026, or within 45 days of receiving your assessment notice, whichever is later.

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Step 4: Attend your hearing before the Mercer County Board of Taxation. Hearings are generally scheduled after the April 1 filing deadline, starting at 9 a.m. on weekdays. Adjournments are generally denied. Present your comparable sales data, photos, appraisals, and any other evidence demonstrating your property's true market value is lower than the assessed value. The burden of proof is on you to show the assessment is unreasonable.

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Step 5: Receive the Board's written judgment. If you are dissatisfied with the Mercer County Board of Taxation's decision, you have 45 days from the date your judgment was mailed to file a further appeal with the New Jersey Tax Court (CN 972, Trenton, NJ 08625, phone 609-292-5082). Note: Properties assessed over $1,000,000 may bypass the County Board and appeal directly to Tax Court by the April 1 deadline.

Required form: Petition of Appeal form (available from Mercer County Board of Taxation)

Filing Methods

mail:Mercer County Board of Taxation, McDade Administration Building, 640 South Broad Street, Room 317, Trenton, NJ 08650-0068
in-person:McDade Administration Building, 640 South Broad Street, Room 317, Trenton, NJ 08650 (forms can be downloaded but must be printed and submitted physically)

Evidence to Bring

Recent comparable sales of similar properties in your municipality (within 12 months)Independent appraisal reportPhotos documenting property condition issuesRepair estimates or documentation of needed improvementsInformation about property defects or damages affecting value

Mercer County Assessor Contact

Mercer County Board of Taxation

Website: https://www.mercercounty.org/government/board-of-taxation

Online Portal: http://pip.mercercounty.org

Hours: Monday through Friday, 8:30 a.m. to 4:30 p.m.

Tax Exemptions in Mercer County

Senior Citizen / Disabled Person Deduction

$250

An annual deduction from real property taxes for qualified senior citizens, disabled persons, or their surviving spouses.

Eligibility: You must be age 65 or older by December 31 of the pretax year, or permanently and totally disabled, or an unmarried surviving spouse age 55 or older. You must be a legal resident of New Jersey for at least one year prior to October 1 of the year before the deduction is requested, be the owner and permanent resident of the dwelling, and meet income requirements (total income less Social Security or government pension must not exceed $10,000).Deadline: October 1 of the year prior to the tax year (annual update required; forms mailed by Tax Collector in January)

Veteran Deduction

$250

An annual deduction from property taxes for qualified war veterans or their unmarried surviving spouses.

Eligibility: You must be an honorably discharged veteran with active service during specified wartime periods, or the unmarried surviving spouse of such a veteran. You must own the property, be a permanent resident of the dwelling, and be a legal resident of New Jersey. There is no income limit for the veteran deduction.Deadline: File Form V.S.S. with your municipal tax assessor or tax collector (eligibility must be met as of October 1 of the year prior to the tax year)

Disabled Veteran Full Exemption

100% property tax exemption

Full exemption from property taxes on a principal residence for certain totally and permanently disabled war veterans.

Eligibility: You must be a qualified New Jersey resident war veteran who is 100% permanently and totally disabled due to service-connected disabilities as certified by the United States Veterans Administration, or the unmarried surviving spouse of such a veteran. You must own and occupy the dwelling as your principal residence and be a legal resident of New Jersey.Deadline: File Form D.V.S.S.E. with your municipal tax assessor

Mercer County Appeal Packet · $49

Comparable sales evidence, county-specific filing guide, and professional cover letter. Enter your address to get started.

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Frequently Asked Questions

What is the deadline to appeal my property taxes in Mercer County for 2026?
The deadline to file a property tax appeal with the Mercer County Board of Taxation is April 1, 2026, or within 45 days from the date that Assessment Notification postcards are mailed by your municipality, whichever is later. Since assessment notices are typically mailed at the end of January each year, most homeowners have until April 1, 2026 to file. If your municipality underwent a recent revaluation, the deadline may be extended to May 1, 2026. Missing the deadline means you'll have to wait another full year to appeal, so it's critical to act promptly after receiving your assessment notice.
How do I file a property tax appeal in Mercer County?
To file a property tax appeal in Mercer County, you must complete a Petition of Appeal form available from the Mercer County Board of Taxation website or office. You need to prepare three copies: one for the Mercer County Board of Taxation, one for your Municipal Assessor, and one for your Municipal Clerk. The forms can be downloaded online from mercercounty.org/government/board-of-taxation, but they must be printed and physically mailed or delivered to the McDade Administration Building at 640 South Broad Street, Room 317, Trenton, NJ 08650. There is no filing fee for standard appeals. Be sure to include your supporting evidence such as comparable sales data when you file.
What evidence do I need to win my Mercer County property tax appeal?
The most credible evidence for a Mercer County property tax appeal is recent comparable sales of similar properties in your municipality that sold within the past 12 months. You should find 3-5 homes that match your property's square footage, lot size, age, condition, and location, and that sold for less than your assessed value. You can also submit an independent appraisal report, photos documenting property condition issues or defects, repair estimates, or documentation of needed improvements. The burden of proof is on you to demonstrate that your assessment is unreasonable compared to the property's true market value. Your current assessment is legally presumed to be correct, so strong comparable sales data is essential for a successful appeal.
What happens at a Mercer County Board of Taxation hearing?
Tax appeal hearings before the Mercer County Board of Taxation are generally held after the April 1 filing deadline during the work week starting at 9 a.m. Adjournments are generally denied, so you must make every attempt to attend your hearing. If you miss your hearing without a postponement, your case will be dismissed for lack of prosecution, and this dismissal is final for the current year and cannot be appealed to Tax Court. During the hearing, you will present your evidence showing why your property's assessed value does not match its true market value. The Board will review your comparable sales, appraisals, photos, and other documentation, then issue a written judgment after the hearing concluding whether to reduce your assessment.
How much can I save by appealing my property taxes in Mercer County?
On the typical Mercer County home valued near $309,300 at the county's effective tax rate of 3.30%, an over-assessment of even 10% means you are overpaying approximately $1,021 per year. If your assessment is reduced by 10%, you would save over $1,000 annually in property taxes. The actual savings depend on how much your assessment is reduced and your municipality's tax rate. Since a successful appeal typically freezes your assessment at the reduced level until the next revaluation (which can be years or even decades away), the cumulative savings over time can be substantial. With Mercer County's median annual tax bill of $7,344, homeowners who successfully prove their property is overvalued can achieve significant long-term tax relief.
Can I appeal directly to the New Jersey Tax Court instead of the County Board?
Yes, but only if your property's assessed valuation exceeds $1,000,000. In that case, you may bypass the Mercer County Board of Taxation and file a petition of appeal (called a Local Property Tax Complaint) directly with the New Jersey Tax Court by April 1 of the tax year or within 45 days from when assessment notifications are mailed, whichever is later. For properties under $1,000,000, you must first appeal to the Mercer County Board of Taxation. If you are dissatisfied with the County Board's decision, you then have 45 days from the date your judgment was mailed to file a further appeal with the Tax Court. Tax Court appeals are more formal and typically involve legal representation, so most residential property owners start with the County Board process.
Are there property tax exemptions available in Mercer County?
Yes, Mercer County homeowners may qualify for several property tax deductions and exemptions. The Senior Citizen/Disabled Person Deduction provides an annual $250 deduction for residents age 65 or older, permanently disabled persons, or their surviving spouses who meet income requirements (income less Social Security cannot exceed $10,000). The Veteran Deduction provides an annual $250 deduction for honorably discharged veterans with wartime service, with no income limit. The Disabled Veteran Full Exemption provides a 100% property tax exemption for veterans who are certified as 100% permanently and totally disabled by the VA. Veterans who qualify for both the senior and veteran deductions can receive both for a total of $500 in annual deductions. Applications must be filed with your municipal tax assessor using the appropriate state forms.
Should I talk to my local assessor before filing a formal appeal in Mercer County?
Yes, it is strongly recommended that you discuss your assessment with your local municipal tax assessor before filing a formal appeal with the Mercer County Board of Taxation. The assessor can explain how your property was valued, review your assessment information for accuracy, and may be willing to make corrections if there are factual errors such as incorrect square footage, lot size, or property characteristics. An informal review with your municipal assessor may resolve your concerns without the need for a formal hearing. However, if you and the assessor cannot reach an agreement, you still have the right to file a formal appeal with the County Board by the April 1 deadline. This informal step can save time and may lead to a quicker resolution of assessment disputes.

Official Resources

Mercer County Board of Taxation Official Website →

Access appeal forms, instructions, brochures, and contact information for filing property tax appeals in Mercer County.

Mercer County Property Information Portal (PIP) →

Search property records, assessments, sales data, deeds, and tax information for properties throughout Mercer County.

NJ Division of Taxation - Property Tax Information →

Official New Jersey state resource for property tax programs, exemptions, deductions, appeals guidance, and forms for homeowners and veterans.

Mercer County Board of Taxation Appeal Brochure →

Comprehensive guide to preparing for tax appeal hearings in Mercer County, including evidence requirements and procedural information.

For state-wide appeal information including New Jersey's assessment ratio and deadlines, see our New Jersey Property Tax Appeal Guide →

Considering professional help with your appeal? Compare pricing, coverage, and pros/cons in our Best Property Tax Appeal Services (2026) or browse side-by-side service comparisons →

More New Jersey Counties

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← All New Jersey property tax appeal info

Sources: https://www.mercercounty.org/government/board-of-taxation | https://www.ownwell.com/trends/new-jersey/mercer-county | https://www.princetonnj.gov/474/Assessment-Appeals | https://njtaxcalculator.com/mercer-county-nj-property-tax-calculator/ | https://www.nj.gov/treasury/taxation/lpt/lpt-seniordeduction.shtml | https://worldpopulationreview.com/us-counties/new-jersey/mercer-county

Last verified: 2026-07-24