By Eric Berman, REALTOR® | The Eric Berman Team at Compass
TL;DR:
For most Long Island households, selling first is the safer order — it produces a known budget, clean funds, and a purchase offer with no contingency attached. The cost is interim housing and possibly a double move. Buying first avoids that, but carrying two properties frequently runs $12,000 to $16,000 a month combined at Long Island price points, and that number is what actually decides the question. The in-between options — a possession agreement after closing, a home sale contingency, a bridge loan, an equity line opened before listing — each solve part of the problem and each carry a cost worth knowing before choosing.
Why This Is Harder Than It Looks
Selling one home and buying another means running two transactions with two timelines off one pool of money, and the timelines rarely cooperate. The sale can't close until the buyer's financing and the attorneys' work are done. The purchase often can't proceed with confidence until the seller knows what the sale actually nets. And in New York, where closings adjourn routinely and the date on a contract is generally treated as approximate, lining the two up precisely is harder than it sounds.
The question isn't really which order is correct in the abstract. It's which risk a particular household is better positioned to carry — the risk of having nowhere to live for a stretch, or the risk of owning two homes for longer than planned. Those have very different costs, and the right answer depends on how much equity is in the current home, whether the next purchase depends on it, and how much tolerance the household has for disruption.
Start by knowing what the current home would actually net. Commission, transfer taxes, attorney fees, preparation, and a concession reserve come off the top, and the full breakdown of what a Long Island sale costs covers each line. That net figure is the number every option below turns on.
Selling First
This is the order most households should default to, and the reasons are practical. The sale produces a known number rather than an estimate, so the purchase budget is real. The purchase offer carries no contingency on another sale, which makes it considerably stronger in a competitive situation. And there's no period of carrying two mortgages, two tax bills, and two sets of insurance and utilities.
The cost is housing in between. A short-term rental, staying with family, or a furnished apartment for a few months, plus a second move and possibly storage — real expenses and real disruption, particularly for a household with decades of belongings or with children in school. It's worth pricing honestly rather than assuming it's minor.
Two things reduce that cost. The first is negotiating a longer closing on the sale, which buys time to find the next home while the proceeds are still coming. The second is a post-closing possession agreement, sometimes called a rent-back, where the seller stays in the home for a defined period after closing. In New York those are negotiated between the attorneys, commonly involve an escrow holdback to protect the buyer, and have to be acceptable to the buyer's lender, which may have its own occupancy requirements. They work well for a few weeks and become harder to arrange the longer the period.
Buying First
Buying first avoids the interim housing and the double move, and for some households that's worth a great deal. The question is how the down payment gets funded and how long both properties get carried.
The carrying cost is the number to model honestly. Two mortgages or a mortgage plus a paid-off home's taxes and insurance, two sets of utilities, and maintenance on a house nobody's living in — frequently $12,000 to $16,000 a month combined at Long Island price points. Three extra months is a five-figure sum, and it arrives while the seller is under pressure to accept whatever offer ends it. That pressure is the real cost, because it shows up in the sale price.
Funding the purchase before the sale closes usually means one of three things. Cash reserves, where a household has them. A bridge loan, which lets a buyer borrow against the equity in the current home for a short term — useful and genuinely costly, with qualification requirements that include carrying both payments. Or a home equity line opened before the current home is listed, which is the timing point most sellers miss: many lenders won't open a line on a property that's already on the market, so that decision has to be made early or it isn't available at all. Each of those is a lender conversation, and a financial advisor's where retirement or investment assets are involved.
The Options in Between
A home sale contingency makes the purchase conditional on selling the current home. It solves the funding problem and it weakens the offer, sometimes decisively — a seller with competing offers will generally prefer one that doesn't depend on another transaction. It works best in slower markets and on properties that have sat. Where a seller does accept one, they'll often want a kick-out provision allowing them to keep marketing and giving the buyer a short window to remove the contingency if a better offer arrives. The treatment of how contingencies work in practice covers the mechanics from the seller's side.
Coordinated closings — the sale and purchase on the same day or within days — are possible within Long Island and they're fragile. One delay on either side cascades to the other, and given how routinely New York closings adjourn, building a plan that depends on two dates holding is a real risk. It can work; it shouldn't be the only plan. The full picture of what to expect at closing covers why dates move.
Which Situation You're In
A few patterns make the answer clearer.
A household downsizing with substantial equity and the next purchase well within reach can often buy first comfortably, sometimes with cash, and avoid the disruption entirely. That's the most common case where buying first is clearly right.
A household moving up, where the next purchase depends on the proceeds, almost always needs to sell first or use a bridge — the numbers rarely support carrying both.
A household relocating out of state should sell first in nearly every case. The distance makes coordinated closings impractical, and a seller who has already established residency elsewhere faces an estimated nonresident payment at closing of 8.82 percent of net gain on Form IT-2663 — a prepayment rather than an additional tax, but it reduces the wire. The full treatment of how gain is calculated covers it.
And for older homeowners, the sequencing question sits inside a larger one about timing, care, and what the move is for, which the practical sequence for right-sizing works through.
A Worked Example
Consider a composite case — a Nassau County couple selling a colonial that comped near $1,050,000 and buying a smaller home nearby at about $720,000.
Their first instinct was to buy first and avoid moving twice. When they modeled it, carrying both homes came to roughly $13,500 a month, and their agent's read was that the sale could plausibly take three to four months from listing to closing. That made buying first a $40,000 to $55,000 decision before counting the pressure it would put on their asking price.
They sold first instead, negotiated a sixty-day closing, and arranged a three-week possession agreement through their attorneys with a modest escrow holdback. They found the next home during the closing period, closed on it eleven days after the sale, and spent the gap in a furnished rental with most of their belongings in storage.
The disruption was real and shorter than they'd feared. The saving was larger than they'd expected.
Where to Start
Build the net proceeds model on the current home first, since every option turns on it. Talk to a lender early about what you'd qualify for in each scenario — including whether an equity line makes sense and whether it has to be opened before listing. Price the interim housing honestly. Model the carrying cost of owning both for three, four, and six months rather than one. Then decide which risk you're better positioned to carry.
Engage a New York real estate attorney before listing rather than after an offer, since possession agreements and contingency terms are theirs to negotiate. Sellers wanting a read on where the current home sits can start with a quiet look at present value.
The Honest Bottom Line
Most households should sell first. It produces a real budget, a stronger purchase offer, and no period of carrying two homes, and the cost — interim housing and a second move — is usually smaller than the alternative once it's actually priced.
Buying first is right for some households, most often those with substantial equity whose next purchase doesn't depend on the proceeds. For everyone else, the carrying cost and the pressure it puts on the sale tend to outweigh the convenience.
The in-between tools help at the margins and each has a cost. Knowing which one fits is mostly a matter of modeling the numbers before choosing rather than after. For anyone working through that on a specific pair of properties, with no pressure attached, that conversation is available whenever the timing suits.
This is general information, not legal, tax, lending, or financial advice. Bridge loan terms, equity line availability, possession agreements, and contingency provisions vary by lender and contract. Consult a lender, a licensed New York real estate attorney, and a CPA about your circumstances.
FAQs
Should I sell my house before buying another one?
For most Long Island households, yes. Selling first produces a known budget rather than an estimate, lets the purchase offer go in without a contingency on another sale, and avoids carrying two properties at once. The cost is interim housing and possibly a second move, which is real and usually smaller than the alternative once it's priced. Buying first tends to make sense for households with substantial equity whose next purchase doesn't depend on the sale proceeds.
How much does it cost to own two homes while waiting to sell?
Frequently $12,000 to $16,000 a month combined at Long Island price points, counting mortgage or taxes, insurance, utilities, and maintenance on both. Three extra months is a five-figure sum — and the larger cost is often indirect, because a seller carrying two homes is under pressure to accept an offer they'd otherwise negotiate. Model it for three, four, and six months rather than assuming the sale will be quick.
What is a rent-back or post-closing possession agreement?
An arrangement allowing a seller to stay in the home for a defined period after closing. In New York it's negotiated between the attorneys, commonly involves an escrow holdback to protect the buyer, and must be acceptable to the buyer's lender, which may have occupancy requirements. It works well for a few weeks and becomes harder to arrange the longer the period — useful for bridging a short gap between selling and moving into the next home.
Can I use a home equity line to buy before I sell?
Sometimes, and the timing is the part most sellers miss. Many lenders won't open an equity line on a property that's already listed for sale, so the decision generally has to be made before the home goes on the market. Where it's available, it can fund a down payment on the next purchase while the current home sells. It's a lender conversation, and it should happen early in the planning rather than once a listing is live.
Does a home sale contingency make my offer weaker?
Generally yes, sometimes decisively. A seller with competing offers will usually prefer one that doesn't depend on another transaction closing. Contingent offers work best in slower markets or on properties that have been listed for a while. Where a seller accepts one, they'll often want a kick-out provision that lets them keep marketing and gives you a short window to remove the contingency if a better offer arrives.
By Eric Berman, REALTOR® | The Eric Berman Team at Compass
Eric Berman | Long Island & Queens Associate Broker | Compass
1468 Northern Blvd, Manhasset, NY 11030
(917) 225-8596 | eric@ericbermanre.com | theericbermanteam.com
