Start with whether you have a case
Most New Jersey homeowners who think they are over-assessed are applying the wrong test.
They compare the assessment to what the house would sell for, find the assessment higher, and conclude they have grounds. That is not how a county tax board decides it.
The board applies Chapter 123. Every year the Director of the Division of Taxation publishes an average ratio for each municipality — how far assessments in that town have drifted from market value.
Around that ratio sits a Common Level Range: the average ratio plus or minus fifteen percent.
Take a town assessing at 82% on average. The corridor runs from about 70% to about 94%.
Now divide your assessment by what the property is genuinely worth:
- Above 94% — the assessment is reduced to true value multiplied by the average ratio. You have a case.
- Between 70% and 94% — no change. Even though you proved the house is worth less than its assessment, the assessment stands.
- Below 70% — the board increases your assessment.
That last line is not a technicality. An appeal can raise your taxes. Any guide to New Jersey tax appeals that leaves it out is describing half the outcome.
One exception worth knowing. Where the average ratio itself exceeds 100%, the corridor does not apply and the assessment is reduced to true value.
And whether Chapter 123 applies at all
In a revaluation or reassessment year, it does not. The test is switched off entirely.
Assessments are then presumed to sit at 100% of true value, so there is no corridor to test against. You are arguing about the value itself.
Establish this before anything else. It changes both the argument and the deadline.
The effective date is not today
New Jersey assesses as of October 1 of the pre-tax year. Appealing a 2026 assessment means valuing the property as of October 1, 2025.
This is where appraisals get wasted. An appraisal carrying today’s date is a different instrument answering a different question, and boards routinely give it no weight.
If you are collecting quotes, ask each appraiser what effective date they intend to use. It is a fast way to find out who has done this before.
Deadlines
| Situation | Deadline |
|---|---|
| Standard | April 1 |
| Municipality implemented a revaluation or reassessment | May 1 |
| Monmouth, Burlington, Gloucester (alternate assessment calendar) | January 15 |
| Where the bulk mailing of assessment notices falls later | 45 days from mailing |
None of the January 15 counties are in the service area below, but the date catches people who own property elsewhere in the state.
Property assessed above $1,000,000 may go directly to the New Jersey Tax Court rather than the county board.
Filing fees
Set by assessed value, not by county:
| Assessed value | Fee |
|---|---|
| Under $150,000 | $5 |
| $150,000 – $500,000 | $25 |
| $500,000 – $1,000,000 | $100 |
| Over $1,000,000 | $150 |
What we will tell you before you pay for anything
Bring your assessment notice and the municipality. Nothing else.
Working from the published ratio for that town, it takes a few minutes to see roughly where you sit in the corridor — and whether a full appraisal is worth commissioning this year.
Sometimes the answer is that the numbers do not support filing. That is a useful answer, and it costs you nothing.
The appraisal is worth ordering when the screening shows room above the upper limit. Order it early: the report has to exist before the hearing, not before the deadline.
This page describes appraisal practice and publicly available procedure. It is not legal advice, and the screening conversation is not an appraisal.
New Jersey specifics
- The effective date is October 1 of the pre-tax year. An appraisal valuing the property as of today is the wrong instrument and boards routinely give it no weight.
- Chapter 123 compares your assessment-to-true-value ratio against the municipality's average ratio plus or minus 15%. Falling inside that corridor means no reduction, even if you prove the property is worth less than its assessment.
- If your ratio falls below the lower limit of the corridor, the county board is required to increase your assessment. An appeal can raise your taxes.
- Chapter 123 does not apply at all in a year when the municipality has implemented a revaluation or reassessment.
- The standard filing deadline is April 1. It moves to May 1 where a revaluation or reassessment was implemented, and to January 15 in Monmouth, Burlington and Gloucester counties, which run an alternate assessment calendar.
- Filing fees are set by assessed value, not by county — $5 under $150,000, $25 to $500,000, $100 to $1,000,000, and $150 above that.
- Property assessed over $1,000,000 may be filed directly with the New Jersey Tax Court instead of the county board.
What you receive
- Appraisal report with an effective date of October 1 of the pre-tax year
- Value conclusion stated so it can be compared directly against the assessment
- Comparable sales that closed in the window the board will accept
- Signed USPAP certification
- Digital delivery to you and, on instruction, to your attorney
What we need from you
- Your current assessment notice, showing land and improvement values
- The municipality and block and lot
- Interior access — an exterior-only appraisal is materially weaker at a hearing
- Any prior appeal history on the property