What is Chapter 123?
Chapter 123 (N.J.S.A. 54:51A-6) establishes the rules for determining whether a property assessment is "within range" of the district average.
It creates a ±15% corridor around the Director's ratio. Properties assessed within this corridor cannot successfully appeal based solely on their ratio - they're considered to be at "common level."
This matters because commercial properties are often assessed at 100% of market value (after a reassessment or revaluation), while residential properties may lag behind due to infrequent reassessments. When the average ratio drops, commercial properties at 100% can end up outside the corridor.
The ±15% Corridor
Key insight: At 80% average ratio, a property assessed at 100% is 8 points above the corridor ceiling (92%). That property can appeal under Chapter 123 for a reduction.
Check Your Property
Enter your district's average ratio and your property numbers to see where you fall relative to the corridor.
Two Houses Within the Corridor
When assessments differ but both fall within the common level range, neither owner has automatic appeal standing under Chapter 123.
How the Corridor Works
The Corridor Creates a Zone of Acceptable Variation
Perfect uniformity isn't required - only that assessments stay within the ±15% range of the district average. This acknowledges that property valuation involves estimates and allows for some variation without triggering appeal rights.
Inside the Corridor = No Automatic Appeal
If your assessment ratio falls within the ±15% common level range of the Director's ratio, you cannot win an appeal based solely on the ratio being "unfair." You'd need to prove the assessment itself is incorrect.
Outside the Corridor = Appeal-Exposed
If your ratio is above the corridor ceiling, you have Chapter 123 standing. This is why commercial properties at 100% become vulnerable when the average ratio drops below 87%.
Explore Topics
The 87% Cliff
When the average ratio drops below 87%, commercial properties assessed at 100% become appeal-exposed.
Learn moreWhy This Matters
When municipalities delay reassessments, the average ratio drifts below 100%. As it falls, the corridor narrows. Eventually, commercial properties assessed at market value end up outside the corridor - giving them legal grounds to appeal.
Successful appeals shift tax burden from commercial to residential properties, and the municipality (not the school district or county) must pay refunds plus interest (N.J.S.A. 54:3-27.2).