Warren County property tax appeals
Your deadline runs from the date on your assessment notice.
Appeals go to Warren County Board of Taxation.
New Jersey values your home as of October 1 and lets you appeal the assessed value to your County Board of Taxation, usually by April 1. Because towns assess below full value, an appeal wins only when your assessment-to-market ratio falls outside the Chapter 123 common level range. It makes sense when recent comparable sales show your value is too high, and usually will not help if your bill rose only because the tax rate went up.
- Recent comparable sales show your home's true market value, measured against your town's average ratio, is below your assessed value.
- You bought recently for clearly less than the market value your assessment implies.
- Your town assesses well below full value, so even a modest over-assessment can push you outside the common level range.
- Your bill went up but your assessment is fair. A higher bill often comes from the tax rate or the local budget, not your value.
- Your ratio sits inside the Chapter 123 common level range. The board will not change an assessment already within the allowed band.
Read the full explanation
In New Jersey, your town's assessor sets your home's value as of October 1 of the year before the tax year, and you appeal that assessed value, not your tax bill. Because most towns do not assess at full market value, the state publishes an average ratio for each municipality, and an appeal lowers your assessment only when the ratio of your assessment to your home's true market value falls outside the Chapter 123 common level range, a band of plus or minus 15 percent around that average. You file a petition with your County Board of Taxation, usually by April 1, though Monmouth and Burlington counties use an earlier January 15 window, and a home assessed above $1,000,000 may instead go straight to the State Tax Court. An appeal helps when recent comparable sales show your true market value, measured against that ratio, is below your assessment. It usually will not help just because your tax bill went up, since a higher bill can come from the tax rate or the local budget, not your assessed value. This is general information, not tax advice.
Source: New Jersey Division of Taxation (property tax appeals) · checked 2026-07-16. In Florida we run the numbers for you. In New Jersey we give you the deadline, where to file, and the rules, verified against official sources.
- Filing window:
- You file a petition with the Warren County Board of Taxation on or before April 1 of the tax year, or 45 days from the date your municipality finishes mailing assessment notices, whichever is later. The deadline moves to May 1 in a town that completed a municipal-wide revaluation or reassessment, and to the next business day when it lands on a weekend or holiday. A home assessed above $1,000,000 may instead file directly with the State Tax Court. The 2026 window has closed; the same dates recur for the 2027 tax year.
- Where to file:
- Warren County Board of Taxation
- Filing fee:
- Filing fee is set by state law by assessed value: under $150,000 is $5, $150,000 to under $500,000 is $25, $500,000 to under $1,000,000 is $100, and $1,000,000 or more is $150.
- Phone:
- 908-475-6070
Verified against official sources, approved 2026-08-07.