Capital Gains and the Long Island Home Sale: What Sellers Need to Understand Before They Price

ByPawli Paola Meyer

One of the conversations I have most often with long-term North Shore homeowners — people who bought in the late 1990s, or 2002, or 2008 — starts the same way. They’ve been thinking about selling. They’ve done some research on what homes are moving for in their neighborhood. The numbers are good. The numbers are sometimes extraordinary. And then someone mentions capital gains, and the mood in the room shifts.

There is a lot of confusion about how capital gains taxes work on residential real estate, and some of that confusion is expensive. Sellers who don’t understand the rules overpay. Sellers who don’t understand the rules also, occasionally, underprice their decision to sell — walking away from a move that made perfect financial sense because they assumed a tax burden larger than the one they’d actually face. Neither outcome serves you.

What follows is not tax advice. I am a real estate broker, not a CPA, and the specifics of your situation — your basis, your exclusion eligibility, your filing status, any depreciation recapture if the property was ever a rental — require a licensed tax professional who knows your complete financial picture. What I can do is make sure you understand the landscape well enough to have that conversation productively before we ever put a sign in your yard.

The Section 121 Exclusion: The Most Important Number in Residential Real Estate Taxation

Section 121 of the Internal Revenue Code allows homeowners to exclude a significant portion of their capital gain from a primary residence sale from federal income tax. The exclusion is $250,000 for single filers and $500,000 for married couples filing jointly. This is not a deduction — it is an exclusion. The gain, up to that threshold, simply does not appear in your taxable income.

To qualify, you must have owned and used the home as your primary residence for at least two of the five years immediately preceding the sale. The two years do not have to be consecutive. They do not have to be the most recent two years, though they most commonly are.

For the North Shore seller who bought a house in 2001 for $380,000, spent two decades raising children in it, and is now receiving offers in the range of $900,000 to $950,000, the rough calculation looks like this: the gain is approximately $520,000 to $570,000 against their original purchase price. If they’re married and filing jointly, the $500,000 exclusion covers the vast majority of that gain. If they’re single, $250,000 of the gain is excluded and the remainder is potentially taxable at long-term capital gains rates — which, depending on their income level, range from 0% to 20% at the federal level, with New York State adding its own layer on top.

This is why the math matters before you list. Whether that gain lands mostly inside or mostly outside the exclusion is not a trivial question when you’re talking about a transaction in the high six or low seven figures.

What Long Island’s Appreciation Curve Does to Long-Term Owners

Long Island real estate, particularly on the North Shore and the East End, has appreciated substantially over the past two decades. Homeowners who purchased in the late 1990s through the early 2000s — even those who bought during what felt at the time like a seller’s market — are sitting on gains that would have seemed implausible when they signed their mortgage paperwork.

The lock-in effect has kept a lot of those homeowners in place longer than they might otherwise have stayed — a combination of low rates on existing mortgages, emotional attachment, and uncertainty about what comes next. But the appreciation has continued regardless, and for sellers who’ve owned 15 to 25 years, the gain embedded in a typical North Shore home can be substantial.

The calculation most sellers anchor to is the difference between purchase price and sale price. That’s the starting point, but it’s not the complete picture. Your adjusted cost basis — the figure you actually use to calculate the gain — can be higher than your original purchase price if you’ve made capital improvements over the years. A kitchen renovation, a new roof, an addition, a finished basement — these expenditures, properly documented, increase your basis and reduce your taxable gain. A pool you put in twelve years ago and have receipts for is not just a selling point. It’s a basis adjustment.

I say “properly documented” because this is where sellers most often leave money on the table. If you cannot produce documentation — contracts, permits, receipts, cancelled checks — it is harder to substantiate the basis increase. Before you list, it is worth going through your records for any capital improvements made during your ownership and assembling what you can find. Your CPA will need this.

The Married vs. Single Distinction Matters More Than Many Sellers Realize

The $250,000 / $500,000 split in the Section 121 exclusion is straightforward on paper but can create real complications in practice. A recently widowed seller who owned the home jointly with a spouse and sold within two years of the death may be eligible for the full $500,000 exclusion if they meet the ownership and use tests. A seller who divorced may have a complicated ownership history that affects both basis and exclusion eligibility.

New York State also conforms to the federal exclusion in its basic structure, but New York’s top marginal income tax rate means that gains above the exclusion can face meaningful state taxation in addition to federal rates. For high-income sellers — those in professions or investment situations where total income is already in the higher brackets — the combined federal and state tax rate on gains above the exclusion can be significant.

This is not a reason not to sell. It is a reason to know your number before you price.

1031 Exchanges: The Investment Property Question

The Section 121 exclusion applies only to primary residences. If the property you’re selling is an investment property — a rental, a second home that was primarily held as investment, commercial real estate — the 1031 exchange is the mechanism that allows you to defer capital gains taxes by rolling the proceeds into a like-kind replacement property.

A 1031 exchange is a strict procedural instrument. The IRS requires that you identify the replacement property within 45 days of the sale and close on it within 180 days. The exchange must be handled through a qualified intermediary — you cannot touch the proceeds directly. The replacement property must be of equal or greater value. And the exchange must be properly structured from the beginning; you cannot decide to do a 1031 exchange after you’ve already received sale proceeds.

For a North Shore seller who owns a rental property — a converted carriage house, a second home that’s been generating income, a small commercial building — the 1031 exchange can be a powerful tool for repositioning capital without triggering an immediate tax event. But it requires planning that begins well before the property goes to market, which is why I mention it here rather than after the fact.

Mixed-Use Properties and the Rental History Complication

Some North Shore sellers own homes that spent time as rentals — perhaps during a period of relocation, perhaps as part of an estate, perhaps as a deliberate income strategy. If the property was ever used as a rental and depreciation was claimed on your tax returns, that depreciation may be subject to recapture at sale regardless of whether you qualify for the Section 121 exclusion on the appreciation portion of the gain.

Depreciation recapture is taxed at a maximum rate of 25% at the federal level, separate from the capital gains rate. For sellers who depreciated a rental property over multiple years, this can be a meaningful number. Again: this is not a reason to avoid selling. It is a reason to know what you owe before you negotiate terms.

The Practical Recommendation: Call the CPA Before We Talk Price

The sequence I recommend to every long-term North Shore homeowner who is seriously considering a sale is this: talk to your accountant before we have a pricing conversation. Not because the tax situation will necessarily affect the price — it usually won’t, and it shouldn’t, because the market determines what buyers will pay. But because understanding your net proceeds after tax changes the calculus of the decision itself.

A seller who discovers they owe significantly more in taxes than they expected may reconsider their timeline. A seller who discovers their gain is largely covered by the Section 121 exclusion may feel more confident moving forward. A seller with documented capital improvements may realize their basis is higher than they thought, reducing the gain. All of these conversations are more productive before you list than after you’re under contract.

What you net from a home sale is not simply the sale price minus the mortgage payoff and the commission. It is the sale price minus the mortgage payoff, minus the commission, minus the transaction costs — and, potentially, minus the tax owed on the gain. The seller net sheet your broker provides is a starting approximation, not the final accounting. What a real estate commission actually costs you is one part of that calculation. The tax piece is another, and it’s the part most sellers come to last, when they should have come to it first.

Long Island is an exceptional market for long-term homeowners. The appreciation is real, the demand is real, and the wealth that many North Shore families have built through homeownership is genuinely significant. The goal is to move that wealth forward — into your next chapter, your retirement, your children’s education, whatever comes next — in the most informed way possible.

This post is for informational purposes only and does not constitute legal, tax, or financial advice. Capital gains rules are complex and fact-specific. Consult a licensed CPA or tax attorney for guidance on your individual situation before making any decisions about the sale of real property.

Real estate markets change. For current listings and market data, contact Pawli at Maison Pawli.

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Sources

  • Internal Revenue Code Section 121 — law.cornell.edu
  • IRS Publication 523, Selling Your Home — irs.gov
  • IRS Publication 544, Sales and Other Dispositions of Assets — irs.gov
  • IRC Section 1031, Like-Kind Exchanges — law.cornell.edu
  • New York State Department of Taxation and Finance — tax.ny.gov

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