By Eric Berman, REALTOR® | The Eric Berman Team at Compass
TL;DR:
Long Island sellers face three categories of tax at a sale: the NY State Transfer Tax (0.4% of the price, paid by the seller), prorated property taxes through the closing date, and potentially federal capital gains tax on profit above the primary-residence exclusion. Most sellers under the exclusion owe little beyond the transfer tax — but long-held homes and out-of-state moves change the math, and the planning belongs before listing, not after closing.
The Three Buckets That Actually Matter
When a Long Island seller asks what taxes they'll pay, the honest answer is that it sorts into three buckets, and only one of them is a surprise to most people. The first is the transfer tax — predictable, fixed, and built into every net sheet. The second is the property-tax proration at closing, which is an adjustment more than a tax. The third is capital gains, which is where the real planning lives and where the dollar amounts can get large for sellers who've owned a long time.
The reason this matters is that the three buckets behave completely differently. The transfer tax is the transfer tax — there's no strategy to it, just arithmetic. The property-tax proration usually nets out close to even. But capital gains is the one with exclusions, exceptions, timing rules, and real planning levers, and it's the one most sellers don't think about until an accountant raises it weeks before closing. Sorting these apart early is what keeps the bottom-line number from shifting under a seller's feet.
The full picture of what comes out of a sale — taxes plus commission, attorney, and municipal items — lives in the Long Island closing-costs guide, which walks through every line on the net sheet. This post focuses specifically on the tax layers.
The NY State Transfer Tax — Simple and Unavoidable
The New York State Transfer Tax is calculated at $4 per $1,000 of the sale price — 0.4% — and it's paid by the seller at closing. On a $600,000 sale, that's $2,400. On a $1,200,000 Manhasset sale, $4,800. On a $2,500,000 sale, $10,000. The math is linear and there's no exemption for primary residences, so every Long Island seller should plan on it from the start.
There's no strategy to reduce the transfer tax — it's a fixed percentage of the contract price, collected by the state through the seller's attorney at closing. What sellers can do is make sure it's accurately reflected in the net sheet from day one, so the number they're planning around is the real one. The transfer tax is the single most predictable cost in the entire transaction, which makes it the easiest to plan for and the least worth worrying about.
The Mansion Tax — Why Sellers Care About a Buyer's Tax
The Mansion Tax is a 1% tax on residential sales of $1,000,000 or more in New York State, with additional progressive tiers above $2M in the New York City portion of the market (which includes the Queens neighborhoods of Bayside, Fresh Meadows, Jamaica Estates, Whitestone, and Douglaston). Technically, the Mansion Tax is paid by the buyer, not the seller — so why should a seller care?
Because it shapes buyer behavior at exactly the price points where many Long Island homes sit. A home priced at $1,025,000 triggers a $10,250 Mansion Tax bill for the buyer; the same home priced at $999,000 triggers nothing. That $26,000 difference in list price becomes a $36,000 difference in the buyer's all-in cost. Sellers in the Manhasset, Port Washington, Garden City, Roslyn, and Old Westbury price bands need to understand where their home sits relative to the $1M threshold, because pricing strategy around that line affects how many buyers will engage and at what level. An experienced listing agent treats the Mansion Tax cliff as a pricing input, not a footnote.
Property Taxes at Closing — An Adjustment, Not a Bill
Property taxes on Long Island are paid on a schedule that rarely lines up cleanly with the closing date, so at closing the attorneys prorate them. The seller is responsible for property taxes up through the closing date; the buyer takes over from there. If the seller has prepaid taxes beyond the closing date, the seller gets a credit back. If taxes are owed through closing, the seller pays that portion. It's an adjustment that usually nets close to even — not a separate tax bill on top of everything else.
The wrinkle on Long Island is the Nassau County reassessment cycle, which has created situations where the assessed value, the school tax bill, and the general tax bill don't always move in sync. For sellers who've received a reassessment notice or filed a grievance, the proration math can get more complicated, and a good attorney catches the nuance. For a deeper look at how reassessment affects a sale specifically, the Nassau County property tax reassessment guide breaks down what sellers need to know.
Capital Gains — Where the Real Planning Lives
Capital gains tax is the bucket that matters most for sellers who've owned their home a long time, and it's the one with actual planning levers. The federal primary-residence exclusion allows a single filer to exclude up to $250,000 of gain, and a married couple filing jointly to exclude up to $500,000, provided they've owned and lived in the home as a primary residence for at least two of the last five years. For most Long Island sellers, the exclusion covers the entire gain and capital gains tax never comes into play.
The sellers who need to plan carefully are the ones who've owned a long time. A couple who bought a Garden City or Manhasset home for $300,000 in the 1990s and is selling for $1.4M today has a $1.1M gain. After the $500,000 exclusion, $600,000 is potentially taxable at federal long-term capital gains rates — plus the 3.8% net investment income tax for higher earners, plus New York State income tax on the gain, since New York taxes capital gains as ordinary income. That's a meaningful number, and it's the reason a conversation with a CPA before listing is the right sequence. Documented capital improvements over the years — a renovated kitchen, an addition, a new roof — increase the cost basis and reduce the taxable gain, which is why keeping receipts matters more than most homeowners realize.
For long-held homes specifically, the capital gains on a long-held Long Island home guide walks through the basis-and-exclusion math in more detail. The short version: most sellers are fine, but the ones who aren't really aren't, and they should know before they list.
The Out-of-State Seller Wrinkle Most People Miss
Sellers who have already moved out of New York — or who are selling a Long Island home as part of a relocation to Florida, the Carolinas, Texas, or anywhere else — run into a rule that catches a lot of people off guard. New York requires nonresident sellers to pay estimated state income tax on the gain at closing, withheld through Form IT-2663. This isn't an additional tax; it's a prepayment of the state tax that would be owed on the gain anyway, collected at closing rather than at tax time. But it affects cash flow at the closing table, and a seller who didn't plan for it can be surprised by a smaller-than-expected check.
This matters most for the relocation crowd, where the Long Island sale is funding a purchase somewhere else. Knowing the withholding is coming — and how it interacts with the capital gains exclusion — lets the seller plan the closing-table cash flow accurately. A seller relocating out of state should flag the move to both their attorney and their CPA early, because the interaction between the federal exclusion, the New York nonresident withholding, and the destination state's rules is exactly the kind of thing that's easy to plan for in advance and painful to discover at closing.
How to Plan So Nothing Is a Surprise
The sellers who feel good about the tax side of their sale are the ones who saw the numbers before they listed. That means a realistic net sheet that includes the transfer tax, a capital gains estimate run with a CPA if the home has appreciated significantly, a clear understanding of where the home sits relative to the Mansion Tax threshold, and — for anyone relocating out of state — awareness of the nonresident withholding. None of these are obstacles. They're just inputs, and inputs are only stressful when they show up unannounced.
The right sequence is straightforward: get a current valuation, run the net sheet, and loop in a tax professional early if the gain looks like it might exceed the exclusion. For sellers ready to see where the numbers land on their specific home, the home valuation tool is a quiet starting point — and the conversation can stay low-pressure from there, with referrals to trusted tax professionals available whenever the timing makes sense.
FAQs
Q: How much is the transfer tax when selling a home on Long Island?
A: The New York State Transfer Tax is $4 per $1,000 of the sale price, or 0.4%, paid by the seller at closing. On a $600,000 sale that's $2,400; on a $1,200,000 sale it's $4,800. There's no primary-residence exemption, so every Long Island seller should plan on it. It's the most predictable cost in the transaction.
Q: Does a Long Island seller pay the Mansion Tax?
A: No — the Mansion Tax is technically paid by the buyer on sales of $1,000,000 or more. However, sellers of homes near or above the $1M threshold need to understand it, because it affects buyer affordability and behavior. A home priced just above $1M triggers a Mansion Tax bill for the buyer that a home priced just below does not, which makes the threshold a real pricing consideration for sellers in the higher price bands.
Q: Will a Long Island seller owe capital gains tax?
A: Most won't. The federal primary-residence exclusion shelters up to $250,000 of gain for single filers and $500,000 for married couples filing jointly, provided they've lived in the home for two of the last five years. Sellers who've owned a long time and have a gain exceeding the exclusion may owe federal capital gains tax, the 3.8% net investment income tax, and New York State income tax on the excess. Documented capital improvements raise the cost basis and reduce the taxable gain, so keeping records matters.
Q: What taxes apply if a seller already moved out of New York?
A: New York requires nonresident sellers to pay estimated state income tax on the gain at closing, withheld through Form IT-2663. It's a prepayment of tax that would be owed anyway, not an extra tax, but it affects the cash the seller walks away with at closing. Sellers relocating out of state should flag the move to their attorney and CPA early so the closing-table cash flow is planned accurately.
Q: When should a Long Island seller talk to a tax professional?
A: Before listing, not after closing. For sellers whose gain might exceed the exclusion — typically those who've owned a long time or are selling an investment or inherited property — a CPA conversation early in the process allows time to gather improvement records, plan the timing, and understand the full tax picture before any commitments are made. An experienced listing agent can provide referrals to trusted local tax professionals.
By Eric Berman, REALTOR® | The Eric Berman Team at Compass
Eric Berman | Long Island & Queens REALTOR® | Compass 1468 Northern Blvd, Manhasset, NY 11030 (917) 225-8596 | eric@ericbermanteam.com | theericbermanteam.com
