Everyone on Long Island knows the taxes are high. What almost no one has seen is exactly where Nassau lands when you line it up against the other 3,142 counties in the country. The answer is near the very top.
Where Nassau ranks nationally
Census-based figures compiled by Tax-Rates.org put the county's standing in blunt terms:
The second number matters more than the first. Plenty of expensive places carry big tax bills — that's what expensive means. Ranking 4th in the nation for tax as a percentage of what people actually earn is a different statement entirely. It says the bill is heavy relative to the income carrying it.
High home values are only half of it
High bills can come from high home values alone. Nassau's problem is compounded by the effective rate itself. ATTOM's ranking of the counties with the highest effective property tax rates in 2025 is populated heavily by the New York metro region, with several downstate and Long Island-adjacent counties appearing in the national top tier. In other words, homeowners here are hit from both sides at once: expensive homes, taxed at an unusually high percentage of their value.
Why it got this way
None of this is an accident, and little of it is really about waste.
School districts are the largest line on most Nassau tax bills, and Long Island runs a striking number of small districts, each with its own administration and its own budget. Layer on towns, villages, and special districts for fire, water, sanitation, and libraries, and a single parcel can sit inside a stack of overlapping taxing authorities — each drawing its own slice.
Nassau is also effectively built out. There's little new construction to spread the levy across, so the existing base carries nearly all of it.
The part you can actually change
You can't argue the tax rate down — that's set by budgets you don't control. You can argue that your assessed value is wrong, and the assessed value is half of the equation that produces your bill.
A challenge never touches the rate. It questions the number the county believes your home is worth. If that figure sits too high relative to comparable homes near you, you're carrying more than your share of the same levy — and unlike the rate, that's a fixable problem.
You're not going to turn Nassau into a low-tax county. But you shouldn't be paying more than the house next door for a home worth the same.