NYC's property tax system is famously confusing. Unlike most of the country, the city groups properties into four tax classes, applies different assessment ratios and caps to each, and then applies a class-specific tax rate set each year by the City Council.
Most one- to three-family houses fall into Class 1. Co-ops, condos, and rental buildings of four units or more fall into Class 2. The published Class 1 tax rate looks high (around 20% in recent years), but it's applied to a heavily reduced 'assessed value' — not to market value — so the effective rate is much lower than it sounds.
Two important caps drive most of the unfairness people experience. For Class 1, the assessment can't rise more than 6% in any one year or 20% over five years. That cap, combined with a market that's risen unevenly across the boroughs, is why two similar Brooklyn or Queens homes a block apart can pay wildly different taxes.
For owners considering selling — especially of inherited or long-held homes — the tax bill matters in two ways. First, your buyer's effective bill may reset upward over time as caps re-baseline. Second, ongoing taxes are part of the holding-cost math while a property sits empty or in probate.
If your bill looks wrong, you can challenge it through the NYC Tax Commission during the annual filing window. Deadlines are strict and the process is paperwork-heavy, so most owners use a tax cert specialist who works on contingency.