Chapter 123: The NJ Law That Protects You from Unfair Assessments

What Is Chapter 123?

Chapter 123 of New Jersey law — codified at N.J.S.A. 54:51A-6 — is the legal standard that governs how county boards of taxation evaluate property tax appeals. It is the single most important rule you need to understand before filing an appeal.

The law was designed to account for the fact that different NJ municipalities assess at different percentages of true market value. A town that last revalued in 2010 may assess at 60 cents on the dollar, while a freshly revalued town assesses at 100%. Chapter 123 creates a uniform framework that makes appeals fair across this inconsistency.

The Director's Ratio

Each year, the NJ Director of Taxation calculates an Average Ratio (also called the Director's Ratio) for every municipality. This ratio represents the average relationship between assessed values and true market values in that town — based on actual sales that year.

For example, if a town's Director's Ratio is 85%, it means assessed values in that town are, on average, 85% of market value. If your assessed value is $500,000 in that town, your implied market value is approximately $588,000.

The Common Level Range (CLR)

Chapter 123 defines a Common Level Range of plus or minus 15% around the Director's Ratio. If your assessment falls within this range — relative to your true market value — the board will not grant a reduction on ratio grounds alone.

However, if your assessment is outside the Common Level Range, the statute requires the board to adjust your assessment to the Common Level (the Director's Ratio times your market value) — provided the board accepts your comparable sales as valid evidence of market value. This protection works in both directions: if your property is over-assessed relative to the CLR, the board is required by N.J.S.A. 54:51A-6 to reduce it.

A Practical Example

Suppose your municipality has a Director's Ratio of 90%. The Common Level Range is 76.5% to 103.5% (plus or minus 15% of 90%). Now suppose comparable sales show your home is worth $500,000 on the open market.

• Your current assessed value: $480,000
• As a percentage of market value: 96% — within the CLR. The board will likely not reduce.
• If instead your AV was $530,000: that is 106% of market value — above the CLR. If the board accepts this comparable evidence, the statute requires it to reduce your assessment to $450,000 (90% of $500,000).

Reval Towns and Chapter 123

In a revaluation year, the Director's Ratio for that municipality is typically set at or near 100%. This means your assessed value is supposed to directly equal your market value. As a result, any comparable sale evidence showing your home is worth less than your assessed value is directly relevant — there is no ratio adjustment to hide behind.

This is why reval years produce the most successful appeals. Homeowners in towns like Paramus, Cresskill, and Verona have a direct, transparent comparison between their assessed value and market value.

What "Market Value" Means in Chapter 123

Under Chapter 123, market value is established primarily through comparable sales — recent arm's-length transactions of similar properties in the same municipality. The board looks at size, age, condition, and proximity. Courts have consistently held that three to five good comparables are sufficient to establish market value at a BOR hearing.

When Chapter 123 Helps You Most

Chapter 123 is most powerful when:

• Your town recently revalued and comparable sales clearly show a lower market value.
• Your assessed value is above 100% of market value in any municipality.
• You have solid comparable sales from the same town, close in time to the assessment date (October 1 of the prior year).

If you are unsure whether Chapter 123 gives you a strong case, check your assessment on PropGap — we show your implied ratio and how your comparable sales compare to the legal standard.