Pull up two comparable listings, one in Butler and one in Kinnelon, and the tax line will do something that looks decisive. Butler's general tax rate for 2025 sits at 2.511. Kinnelon's sits at 2.985. Do the quick subtraction and Kinnelon looks like it costs nearly 19 percent more in property tax than Butler, town for town, dollar for dollar.
That comparison is wrong, and the way it's wrong tells you something useful about how New Jersey actually taxes property, especially if you're one of the buyers cross-shopping these two adjoining Morris County towns because Butler's western edge backs right up against Kinnelon's border.
The Rate You See Isn't Applied to the Price You Paid
The general tax rate published for each municipality gets multiplied against assessed value, not market value, and not the number on the listing. Assessed value is a town's own internal estimate of what a property is worth, set during its last reassessment or revaluation, and it can drift far from actual market value the longer it's been since that town last recalculated.
New Jersey's Division of Taxation tracks exactly how far that drift goes, town by town, through something called the average assessment ratio, and the two towns are not close. Filings for the current tax appeal cycle put Butler's ratio at 87.00, meaning the borough's assessed values run close to 87 percent of true market value. Kinnelon's ratio sits at 74.42, meaning its assessed values run closer to three-quarters of what homes are actually worth. Butler assesses much closer to full value than Kinnelon does, which is the opposite of what the general rate alone would suggest.
What a $600,000 Home Actually Owes in Each Town
Because the two towns sit at such different points in their assessment cycles, the general rate alone can't answer the question. New Jersey publishes a second figure for exactly this reason. The effective tax rate assumes every town is assessed at 100 percent of true value, which strips the ratio distortion out entirely and gives you a genuine apples-to-apples read between towns.
Butler's effective rate for 2025 is 2.377. Kinnelon's is 2.418. Apply each to a $600,000 home and the bill comes out to roughly $14,262 in Butler versus $14,508 in Kinnelon, a difference of about $246 a year.
Compare that to what the general rate implies if you make the mistake most buyers make and apply it straight to the sale price instead of the assessed value: $15,066 in Butler against $17,910 in Kinnelon, a gap of nearly $2,850. The real gap is less than a tenth the size the general rate suggests, and it runs in the same direction, not the reverse.
Why the Ratios Sit This Far Apart
Assessment ratios drift because towns don't reassess on the same schedule, and each one falls further from 100 percent the longer it waits. Butler is about to close that gap. The Morris County Board of Taxation and the New Jersey Division of Taxation have authorized Butler Borough to conduct a full reassessment for tax year 2027, with the borough contracting Associated Appraisal Group to carry it out. The program requires inspecting 20 percent of properties in the borough each year, and it's designed specifically to bring assessed values back in line with current market activity and reduce the volume of tax appeals the town has fielded in recent years.
Here's the part worth flagging if you're timing a purchase around it: a successful reassessment doesn't lower anyone's actual tax burden on its own. It resets the assessed values closer to 100 percent of market value, which means Butler's general tax rate will very likely drop after 2027, sometimes sharply, simply because the same budget gets divided across a much larger total assessed base. A buyer glancing at a lower posted rate after that reassessment could easily read it as Butler getting cheaper, when the effective rate, the number that actually predicts the bill, may barely move.
The Comparison Buyers Actually Need to Make
None of this means the two towns cost the same to own in. It means the tax line by itself isn't the variable that separates them, at least not to the degree the headline rates suggest. What does separate Butler and Kinnelon right now is closer to speed and price movement than tax exposure.
The New Jersey Realtors' local market update for Butler in June 2026 put the median sale price for single-family homes in the borough at $620,500, up 23.9 percent from a year earlier, with buyers paying an average of 108.3 percent of list price and inventory down to about 1.3 months of supply. Separate three-month data through May 2026 showed Butler's median sale price at $617,000, up 14.8 percent year over year, with homes going under contract in a median of 16 days compared to 39 days the year before. However you slice the source, the direction is the same: Butler tightened considerably over the past year, and homes that once sat on the market for over a month are now moving in about two weeks.
Butler's value range still clusters between $400,000 and $700,000 for established single-family homes, with a smaller luxury tier above $900,000 concentrated on larger lots along the town's western edge, closest to Kinnelon. That geography is exactly why the two towns end up on the same shortlist so often. Buyers looking at Kinnelon for its lake access and larger lots frequently widen the search into Butler once they see what a few extra minutes of drive time buys, and the tax comparison is usually the first thing they try to run themselves, often with the wrong formula.
What This Means If You're Choosing Between Them
If a tax rate difference is the deciding factor between a home in Butler and a comparable one in Kinnelon, the effective rate, not the general rate, is the number to run. On most price points in these two towns, that difference lands in the low hundreds of dollars a year, not the thousands a quick headline comparison implies. The variables that actually separate the two markets right now are speed, competition, and where each town sits in its own assessment cycle, and those are the questions worth asking your agent before you write an offer, not after.
A Few Straight Answers
Does a lower general tax rate always mean a lower tax bill? No. The general rate only tells you the multiplier applied to a town's own assessed values, which can sit well below market value. Two towns with very different general rates can produce nearly identical tax bills once you account for how each one assesses property, which is exactly what happens between Butler and Kinnelon.
Will my Butler tax bill change once the reassessment takes effect for 2027? Possibly, but not necessarily in the direction the posted rate suggests. Reassessment resets assessed values closer to full market value, which typically pushes the general rate down since the town's budget gets spread across a larger total assessed base. Your effective rate, and your actual bill, depends on how your specific property's value moves relative to the rest of the borough.
Where can I check my own assessed value and ratio? Morris County maintains searchable tax records by municipality through the Morris County Board of Taxation, and the state's full general and effective rate tables are published annually by the New Jersey Division of Taxation.
Comparing two towns on paper only gets you so far. If you're weighing Butler against Kinnelon, or any other pairing across Morris, Passaic, Bergen, Essex, or Sussex counties, Matt Weiss and the team can walk through the real numbers on a specific address, not just the borough average. Schedule a free consultation and get a comparison built around the home you're actually considering.
