Picture the closing table. The number on the listing sheet said $22,400 in annual property taxes. You did the math, folded it into your monthly budget, and moved on to worrying about the inspection. What almost nobody explains before you sign is that the number you just budgeted around has nothing to do with your purchase price and everything to do with a decision the county made back when gas was under $2 a gallon.
That's not a metaphor. Nassau County's residential assessment roll has been frozen since the 2022-23 tax year, and the county kept renewing that freeze year after year, reaching a fourth consecutive frozen cycle by the 2025-26 tax year with no announced date for when it plans to stop. If you're buying in Manhasset right now, you're not just buying a house. You're inheriting a tax assessment that reflects what the county thought that house was worth years ago, whether or not it has anything to do with what you just agreed to pay.
The Freeze, In Plain Terms
Nassau County assesses property at 100 percent of market value, which sounds precise until you learn how rarely that value gets updated. After a countywide reassessment took effect for the 2020-21 tax year, then-County Executive Laura Curran froze the roll for 2022-23. It stayed frozen the following year, and the year after that. A tax tracker published by the law firm Farrell Fritz in May 2024 noted the county had chosen to freeze its annual tax roll for the fourth straight year, a run that carried the freeze through the 2025-26 tax year.
The freeze doesn't stop your tax bill from changing. School districts and municipalities still set levies every year, and those levies get divided across the existing assessed values. What the freeze stops is the county updating what your specific house is assessed at relative to the market. So while your neighbor's home might have appreciated 40 percent since 2020, the number the county uses to calculate their share of the tax burden hasn't moved to reflect that.
What That Gap Looks Like In Manhasset Right Now
Manhasset is a useful place to see this play out because it's appreciated more than most of Nassau. Zillow's home value index put the average Manhasset home at $2,279,010 as of the update posted May 31, 2026, up 7.5 percent over the prior year. That's on top of years of gains since the 2020 assessment snapshot was taken.
Meanwhile, month-to-month sale prices in a market this small bounce around in ways that can mislead anyone reading a single data point. One tracker showed a median sale price down sharply for January 2026 compared to the year before, a swing driven mostly by the fact that only a handful of homes closed that month. A market where a few multimillion-dollar estate sales or a cluster of smaller condos can swing the median by six figures isn't a market where one month's number tells you much of anything. The assessed value, by contrast, isn't reacting to any of that noise. It's sitting still.
Here's the part that matters for a buyer specifically. In New York, unlike California's Proposition 13 system, a sale doesn't trigger a reassessment. The assessed value stays attached to the property, not the owner. Buy a home with a $22,000 tax bill today, and that's the bill you take over, not a number reset to reflect what you paid. For now, in a frozen system, that can work in a buyer's favor. A home that's appreciated well beyond its 2020 assessment is quietly under-taxed relative to its current value, and that discount transfers to whoever buys it next.
Why The Rate Sheet Doesn't Tell The Whole Story
School district tax rates get treated like a simple comparison shopping tool, and on paper they look that way. The most detailed public composite breakdown by district, compiled in 2021, put Great Neck around 14.0, Manhasset at 14.21, Roslyn at 20.40, and Jericho all the way up at 37.14. Current rates have moved since, but the spread between districts hasn't reshuffled enough to change the point.
| District | 2021 sample composite rate |
|---|---|
| Great Neck | 14.0 |
| Manhasset | 14.21 |
| Roslyn | 20.40 |
| Herricks | 29.77 |
| East Willston | 29.78 |
| Jericho | 37.14 |
Read those numbers next to each other and Manhasset looks like a bargain compared to Jericho. But a rate only tells you what percentage of assessed value gets billed. It says nothing about how current that assessed value actually is. A Manhasset home frozen at a 2020 valuation and a Jericho home frozen at the same vintage aren't comparable just because you can look up both rates on the same table. What actually determines the bill is the interaction between the rate and an assessed value that may be years out of step with the market, and that gap is wider in neighborhoods that have appreciated faster since 2020. Manhasset, along with Port Washington, Garden City, Roslyn, Plandome, Old Westbury, Locust Valley, and Sands Point, is routinely named among the North Shore markets where that gap has grown the most.
The Day The Freeze Ends
Nobody has announced when the freeze will end, and that uncertainty is itself worth planning around. When it does end, the county will have to bring assessed values back in line with actual market values, and homes that have appreciated the most will see the largest jumps. A house currently assessed in a way that implies a value well under its real market price will likely see a correction that pushes the tax bill up, sometimes substantially, once the freeze lifts.
For a buyer closing on a Manhasset home this year, that means the tax bill you inherit at closing is not a permanent number. It's a snapshot that has held steady through an unusually long freeze, and the eventual unfreezing is a real, if undated, risk that belongs in any conversation about long-term carrying costs. It's a fair question to raise with a seller directly, and a fair thing for a seller to be ready to discuss candidly rather than let a buyer discover it later.
Getting Ready For The Next Grievance Window
The freeze doesn't shut down the grievance process. Homeowners can challenge their assessment every year through Nassau County's Assessment Review Commission. This year's filing period, covering the 2027-28 tax year, ran January 2 through the statutory March 2 cutoff, though Nassau extended that deadline to March 31, 2026. That window has already closed. The next one opens January 2, 2027, for the 2028-29 tax year, and filing is free, requires no attorney, and can be done online through the county's Assessment Review on the Web portal.
A few mechanics worth knowing before that next window opens:
- Nassau's grievance calendar runs on a lag. The filing period that closed this past March challenged the assessment feeding the 2027-28 school tax year and the 2028 general tax year, not any bill due this year. Whatever you file in January 2027 will work the same way, shaping a bill that arrives roughly a year and a half later.
- Evidence has to show comparable sales from the past three years, or documentation that the property is unequally assessed relative to similar homes nearby.
- The Assessment Review Commission can lower an assessment but is barred by law from raising one as a result of a grievance, so there's no downside to filing an honest challenge.
- If ARC doesn't resolve things to your satisfaction, the next step for a residential property is a Small Claims Assessment Review petition filed with the Nassau County Clerk's office.
For a seller, a grievance that's already been filed and is moving through the system is worth mentioning early rather than leaving a buyer to find out about it during due diligence. A lower future assessment benefits whoever owns the home when it takes effect, which in many cases will be the buyer, not the current owner. That's a detail that can shift how a buyer thinks about the offer they're prepared to make.
A Few Questions Buyers Usually Ask
Does buying a home in Nassau County trigger a new assessment at the sale price? No. The assessed value stays with the property regardless of what it sells for. A buyer takes over the existing assessment and the existing tax bill, not a number reset to the purchase price.
If the freeze ends while I own the home, will my taxes definitely go up? Not automatically for every property, but homes that have appreciated significantly since the 2020 assessment, which describes much of Manhasset, are the ones most likely to see an increase when the county eventually updates the roll.
Is it worth filing a grievance even though the roll is frozen? Yes. The freeze affects whether the county proactively raises your assessment. It doesn't stop you from challenging an assessment you believe is already too high relative to comparable homes, and a successful grievance still lowers a future tax bill.
If you're weighing a purchase in Manhasset and want a clear-eyed read on what a specific home's tax history actually says about its future carrying costs, that's exactly the kind of question worth working through with someone who watches this market daily. Elaine Tian can walk you through a property's assessment history alongside its sale comps before you write an offer. Schedule a free consultation and get the full picture before the number on the listing sheet becomes the number in your budget.
