How NJ Property Tax Revaluations Work — And Why Your Bill Just Jumped

What Is a Revaluation?

A revaluation (reval) is when a New Jersey municipality reassesses every property from scratch, resetting all assessed values to reflect current market conditions. New Jersey law requires municipalities to maintain assessments at true market value, but most towns do not do a full reval every year. Over time, assessed values drift below market values as prices rise.

When the ratio between assessments and market value falls far enough, the state can order a municipality to conduct a revaluation. Towns may also initiate revaluations voluntarily to restore uniformity in their tax base.

Revaluation vs. Reassessment

These terms are sometimes used interchangeably but have different legal meanings in New Jersey:

• Revaluation involves hiring a private revaluation company to physically inspect and revalue every property in the municipality. It is the most comprehensive type of assessment reset.
• Reassessment is a less intensive process where the assessor reviews and adjusts values, often without a full physical inspection of every property.

Both result in updated assessments, but a full revaluation typically produces larger changes and is more thoroughly reviewed by state authorities.

How Mass Appraisal Works

Revaluation companies use mass appraisal — statistical modeling applied to all properties at once. The assessor (or contracted vendor) groups properties by neighborhood, size, age, and style, then applies valuation models calibrated against recent sales.

The key limitation of mass appraisal: it cannot account for individual property conditions. Your neighbor with a freshly renovated kitchen and yours with a 1980s original may be valued the same if they are the same size and age. Physical inspections help, but they are often superficial — a drive-by or a brief interior visit.

Why Reval Values Often Overshoot

Mass appraisal models are calibrated using historical sales data, often from 12-24 months before the assessment date. In a rising market, using older sales data means models may undervalue properties. In a flat or declining market — or a market with recent softening — the models may overvalue.

Additionally, revaluation companies face pressure to produce values that generate the expected total tax revenue for the municipality. This creates an incentive to err on the high side, particularly for properties in strong-sale-price neighborhoods.

The result: a meaningful percentage of properties in any reval come out over-assessed — sometimes significantly. This is why reval years consistently produce the highest appeal volumes and the highest success rates.

Why Reval Years Produce the Most Successful Appeals

In a reval year, the Director's Ratio is set near 100%. There is no ratio buffer: if your assessed value exceeds your market value, you are outside the Common Level Range. The evidence for an appeal is direct and transparent — your assessed value versus recent comparable sales.

In a non-reval town with a Director's Ratio of 75%, your assessed value could be 85% of market value and still fall within the CLR. In a reval town, any assessed value above market value is immediately over-assessed under Chapter 123.

Towns like Paramus, Glen Ridge, Dumont, Verona, and Englewood are among the 26 NJ municipalities that completed revaluations for 2025–2026. Their homeowners have until May 1, 2026 to appeal.

What Happens to Your Tax Bill During a Reval

A reval does not automatically raise taxes for everyone. The municipality sets a tax rate after the reval, and the rate adjusts to produce the same total levy. Properties that went up more than average pay more; those that went up less than average pay less.

However, if your home was revalued significantly above its true market value, your share of the tax burden is unfairly high — even if the rate seems lower than before.

What to Do After a Reval

1. Review your new assessed value on your blue card notice.
2. Check recent comparable sales to see what similar homes have sold for.
3. If comparables suggest your value is too high, file an appeal before the May 1 deadline.

Enter your address at propgap.ai and we will show you comparable sales and calculate whether your post-reval assessment appears over-market. Many reval-town homeowners find gaps of 10-20% above comparable sales — which at NJ's 2.1% tax rate translates to real money every year.