About NJ Tax Check
Where does the data come from?
All property data comes from New Jersey's MOD-IV Tax List, maintained by each county's tax board. MOD-IV is the official record of property assessments, ownership, and sales data for every parcel in New Jersey. It's the same data used by tax assessors, county boards of taxation, and the NJ Division of Taxation.
How does the tax appeal score work?
The tax appeal score is a simple indicator based on how your assessment compares to the implied market value and comparable properties:
- HIGH — Your assessment appears significantly above market value. There may be strong grounds for a tax appeal.
- MEDIUM — Your assessment is somewhat above what the data suggests. An appeal might be worth exploring with a tax professional.
- LOW — Your assessment appears in line with or below market value. An appeal is unlikely to succeed.
This is not legal or financial advice. The score is an automated estimate based on publicly available data. Always consult a licensed tax appeal attorney or appraiser before filing.
What is the “implied market value”?
Each county in NJ publishes an equalization ratio (also called the “common level range”). This ratio represents how assessments relate to true market value. We divide your total assessed value by this ratio to estimate what the county thinks your property is actually worth.
Useful links
- NJ Division of Taxation — Official state tax authority
- Property Tax Appeal Information — How to file an appeal in NJ
- NJ Property Tax Actor on Apify — Developer API access to the underlying data