Short answer: To appeal your property taxes in Morris County, file Form A-1 with the Morris County Board of Taxation by April 1, 2027 (May 1 in a revaluation year), pay the filing fee, and serve copies on your town’s assessor and clerk. You win only if comparable sales show your assessment falls outside your town’s common level range.
This article is general information, not legal or tax advice. For your specific property, consult a real estate attorney or tax appeal professional.
A property tax appeal does not argue that your taxes are too high. It argues that your assessment is wrong compared with what your home is worth. New Jersey uses a formula called Chapter 123 to decide that, and once you understand it, you can tell in a few minutes whether an appeal is worth filing.
Step 1: Know Your Deadline
According to the state’s Form A-1 instructions, a county board appeal must be received (not just postmarked) by April 1 of the tax year, or 45 days after your town finishes mailing assessment postcards, whichever is later. In a town that implemented a municipal-wide revaluation or reassessment, the deadline moves to May 1. For 2027, that means April 1, 2027 in most towns.
If your assessment is over $1 million, you may file directly with the New Jersey Tax Court instead of the county board.
Step 2: Understand Chapter 123 and the Common Level Range
Most Morris County towns do not assess homes at 100% of market value. Each year the NJ Division of Taxation publishes an average ratio for every town, which estimates how assessments compare with market value. Your assessment is considered fair if your home’s own ratio falls within 15% above or below that average. That band is the common level range.
Here are the ratios the state certified on October 1, 2026, for 2027 appeals in several Morris County towns:
| Town | Average ratio | Lower limit | Upper limit |
|---|---|---|---|
| Boonton Town | 58.15% | 49.43% | 66.87% |
| Boonton Township | 64.08% | 54.47% | 73.69% |
| Denville | 61.04% | 51.88% | 70.20% |
| Kinnelon | 69.22% | 58.84% | 79.60% |
| Montville | 63.69% | 54.14% | 73.24% |
| Morristown | 81.45% | 69.23% | 93.67% |
| Mountain Lakes | 90.37% | 76.81% | 103.93% |
| Parsippany-Troy Hills | 62.98% | 53.53% | 72.43% |
| Randolph | 65.33% | 55.53% | 75.13% |
| Rockaway Township | 88.51% | 75.23% | 101.79% |
The state notes that ratios over 100% are treated as 100%. The full list for all 39 Morris County towns is in the source linked below.
Step 3: Run the Numbers Before You File
Divide your assessment by what you believe your home was worth. If the result is above your town’s upper limit, you likely have a case. Here is an example for Parsippany-Troy Hills:
- Your home is assessed at $400,000.
- Comparable sales support a market value of $550,000.
- Your ratio is $400,000 ÷ $550,000 = 72.73%, which is above Parsippany’s 72.43% upper limit.
- The board would apply the average ratio to your proven value: $550,000 × 62.98% = $346,390, a reduction of about $53,600 in assessed value.
Now change one number. If the comparables support $560,000 instead, your ratio is 71.43%, inside the range, and the board makes no change. That is why so many appeals fail: being a little over-assessed is not enough. Rockaway Township, where assessments sit close to market, is covered in our new Rockaway Township guide, and you can compare towns in our Morris County property tax rates by town post.
Step 4: Gather Comparable Sales
Your evidence is the market value of your home as of October 1 of the pre-tax year (October 1, 2026, for a 2027 appeal). The Form A-1 instructions call for three to five comparable sales, attached to every copy you file. Morris Township’s tax assessor advises that comparables should have sold on or before October 1 of the pre-tax year.
Choose homes similar in size, style, age, lot and location. Other properties’ assessments are not acceptable evidence; only sales are. A real estate agent can pull comparable sales for you, and our home value guide explains how pricing works in Morris County. If you use an appraiser instead, the board requires the appraiser to attend the hearing and testify, and copies must reach the assessor and board at least 7 days before the hearing.
Step 5: File Form A-1 and Pay the Fee
File the original petition with the Morris County Board of Taxation and serve one copy each on your municipal assessor and municipal clerk. Keep a copy for yourself. The filing fee, payable to the County Tax Administrator and non-refundable, depends on your assessment:
| Assessed value | Filing fee |
|---|---|
| Under $150,000 | $5 |
| $150,000 to under $500,000 | $25 |
| $500,000 to under $1,000,000 | $100 |
| $1,000,000 or more | $150 |
You must also be current on your taxes. State law requires all taxes and municipal charges due through the first quarter of the year to be paid for your appeal to be heard. The Board of Taxation is at 30 Schuyler Place in Morristown, phone 973-285-6707.
Step 6: Attend the Hearing
The Morris County board holds hearings in person only, on weekdays starting at 9:30 a.m., and generally denies requests to postpone. If you do not appear, your appeal is dismissed for lack of prosecution, and that dismissal cannot be appealed. The board typically issues its judgment 6 to 8 weeks after the hearing. If you disagree, you have 45 days from the date the judgment was mailed to appeal to the Tax Court.
A judgment that is not appealed generally stays in place for that year and the next two years under New Jersey’s Freeze Act, with exceptions such as a completed revaluation.
Frequently Asked Questions
When is the deadline to appeal property taxes in Morris County?
April 1 of the tax year, or 45 days after your town’s assessment postcards are mailed, whichever is later. The deadline is May 1 in towns that implemented a municipal-wide revaluation or reassessment.
How much does it cost to file a tax appeal in Morris County?
The county board filing fee ranges from $5 for assessments under $150,000 to $150 for assessments of $1 million or more. Most homes assessed between $150,000 and $1 million pay $25 or $100.
Is it worth appealing my property taxes in NJ?
Only if your assessment divided by your home’s market value is above your town’s upper common level range limit. If your ratio falls inside the range, the board will not change your assessment.
Do I need a lawyer to appeal my property taxes?
Not necessarily. Individual homeowners may file and present county board appeals themselves. Many hire an attorney or appraiser for higher-value or complicated properties.
Sources
- NJ Division of Taxation: Form A-1 Petition of Appeal and instructions
- NJ Division of Taxation: Appealing Your Assessment
- NJ Division of Taxation: 2026 Average Ratios and Common Level Ranges for Tax Year 2027
- NJ Division of Taxation: Property Tax Appeal guide
- N.J.S.A. 54:3-21
- Morris County Board of Taxation
- Morris County Board of Taxation: Proper Preparation for Tax Appeal Hearings
- Morris Township: Tax Appeals
- New Jersey Courts: Tax Court
Talk to the MorrisAgent Team
Not sure what your home was worth on October 1? We can help you pull comparable sales for your street. Call (973) 200-4800, email [email protected], or stop by our office at 518 Main Street, Suite 102, Boonton. No pressure, and no surprises.