A buyer comparing two similar homes, one in Holmdel and one in Colts Neck, pulls up both tax rates before she's even scheduled a showing. Holmdel's general tax rate for 2025 sits at 1.539 per $100 of assessed value. Colts Neck's sits lower, at 1.394. On paper, Colts Neck looks like the better tax deal. She crosses it off her list as the more expensive town and moves on.
She has the comparison backward. Colts Neck's average residential tax bill was $16,668 in 2024, the fifth-highest in Monmouth County according to the New Jersey Department of Community Affairs, and well above the county average of $10,930 that same year. A lower rate did not produce a lower bill. It produced a higher one, because the rate is only half the equation and the other half, assessed value, is doing more work than most buyers realize.
The Math Buyers Get Backward
The rate times the assessed value equals the bill. Compare rates alone and you've compared nothing. Compare bills alone and you've missed why they differ. You need both, and in Monmouth County you need to understand why the rate itself moves in the opposite direction of home values almost every year.
Here's how the three towns Doreen's buyers most often cross-shop actually stack up on their 2025 certified general tax rates:
| Township | 2025 General Tax Rate | What Drives the Bill |
|---|---|---|
| Colts Neck | 1.394 per $100 | Large-lot, estate-scale assessed values push the average bill higher despite the lower rate |
| Holmdel | 1.539 per $100 | Denser lot sizes and a narrower price band keep the rate and the bill closer together |
| Middletown | 1.614 per $100 | The county's largest tax base spreads a bigger levy across more properties |
Colts Neck's lower rate exists because its assessed values, driven by acreage and estate construction, are unusually high. Spread the same tax levy across a base with higher average assessments and the rate needed to raise it goes down, even while individual bills stay high. Holmdel's rate sits in between because its housing stock, while upscale, runs denser and more consistent in scale. None of this shows up if you stop at the headline number.
Why Holmdel's Rate Keeps Falling While Bills Don't
Holmdel's rate has been on a steady decline for years. Before 2022, it ran above 2.0. Today it's 1.539. That trend line looks like relief. It isn't, and the reason is a specific mechanism most buyers moving in from outside Monmouth County have never encountered.
Monmouth County runs something called the Assessment Demonstration Program, created under state law in 2013 and adopted here starting in 2014. Under it, Holmdel's assessor is required to bring every property to 100 percent of market value every single year, not once a decade the way most New Jersey towns operate. For 2026, Holmdel's total assessed value across the township rose 9.41 percent compared to 2025. That does not mean individual tax bills are rising 9.41 percent. It means the overall value of everything in town went up, and because the tax rate is calculated by dividing the fixed levy by that total value, a bigger total value produces a lower rate to raise the same money.
This is why the rate keeps dropping even as home prices climb. It isn't a tax cut. It's arithmetic catching up to the market, every year, on schedule.
A falling rate in an annually reassessed town is not evidence of a cheaper town. It's evidence the assessor is doing the job correctly.
Middletown runs the identical mechanism. Its own township government reported that the 2026 aggregate net value will run 7.94 percent higher than 2025, with the tax rate expected to fall in response. If you're comparing Holmdel to Middletown, you're comparing two towns whose rates are both artifacts of the same annual recalibration, which is exactly why neither rate tells you what a specific bill will be without the assessed value attached to it.
Holmdel's own 2026 assessment-to-sale ratio runs at 99.74 percent, inside a state-certified common level range of 84.78 to 114.70 percent. That ratio is close to 100 because the annual system is working as designed. It also means there's very little cushion between what your assessment says and what the market says your home is worth, which matters if you're weighing an appeal.
Where the Two-Thirds Goes
Before anyone assumes a high bill means a bloated municipal budget, it's worth knowing where the money actually lands. Roughly two-thirds of every tax dollar collected in Holmdel funds the school district. The rest splits between the municipal government, Monmouth County, and smaller dedicated funds. When Holmdel's total assessed value rises and the rate falls in response, the school district's approved budget is the anchor that determines how much needs to be raised in the first place. The assessment shift determines who pays what share. It doesn't determine how much gets collected overall.
The Cycle That Repeats Every November
If you're timing a purchase or a sale around this, the calendar matters more than the rate. Here's how the annual cycle runs in Holmdel and every other Monmouth County town on the Assessment Demonstration Program:
- Mid-November — Assessment postcards go out reflecting the new valuation date of October 1. This is your new assessed value for the coming tax year, not last year's number carried forward.
- Through January 15 — The window to file an appeal with the Monmouth County Tax Board stays open. Evidence has to be recent comparable sales, not a general sense that your bill feels high.
- Before filing — All prior-year property taxes through the fourth quarter need to be current. An appeal filed while behind on taxes gets dismissed regardless of merit.
- For properties assessed at $1,000,000 or more — There's a separate option to file directly with the New Jersey Tax Court by April 1, the same threshold that applies statewide.
- May through June — The certified tax rate for the year is finalized, which is why first and second quarter bills are always estimates and any change lands in the third and fourth quarter payments.
For sellers, this means a listing that goes live in October or November may show a different assessed value than the one buyers see in a spring closing. For buyers, it means the tax figure on a listing sheet in December could shift once the new rate is certified the following summer.
A Few Questions Worth Settling Before You Compare Towns
If Holmdel's rate has been falling for years, does that mean it's becoming a cheaper place to own? Not by itself. The rate falls because assessed values are rising to meet the market under the annual reassessment program. Whether your actual bill goes up, down, or stays flat depends on whether your specific property's assessment moved more or less than the townwide average.
Is a town with a lower rate automatically a lower-tax town? No, and Colts Neck versus Holmdel is the clearest example available right now. Always ask what the average or median bill actually runs, not just what rate produced it.
Can I appeal every year if I think my assessment is off? Yes. Because Holmdel reassesses annually, the appeal window reopens every year following the November postcard, with a filing deadline of January 15. Recent comparable sales are the evidence that carries weight.
If you're weighing a move within Monmouth County and the tax math feels harder to compare than the listings themselves, that's a reasonable place to bring in someone who reads these numbers for a living. Doreen DeMarco works Holmdel and the surrounding towns daily and can walk you through what a specific address's assessment history actually means for your bottom line. Start with a free home valuation and get the real number, not just the rate.
