A house sells for exactly $2,000,000 in Southampton Town. The buyer's transfer tax bill comes to roughly $40,000. A nearly identical house down the road sells for $2,000,001, one dollar more, and the buyer owes roughly $50,000. Same neighborhood, same rate, same paperwork. The only difference is a single dollar of purchase price, and it costs the buyer ten thousand more.

That is not a rounding error. It is how the Peconic Bay Community Preservation Fund tax is written into Southampton Town's own rules, and it is the kind of detail that a generic closing-cost checklist glosses over because the math only shows up when you run real numbers through it.

How the exemption actually works, and where it stops working

Southampton Town's Community Preservation Fund FAQ describes the tax plainly: a 2.5% transfer tax on real property, made up of the original 2% CPF tax plus a 0.5% Community Housing Fund tax that has applied to conveyances since April 2023. For an improved residential parcel, the first $400,000 of the purchase price is exempt from that tax. For vacant, unimproved land, the first $100,000 is exempt.

The part that catches people off guard sits in the next clause. The Town's FAQ specifies that the $400,000 exemption applies only "$2,000,000 or less." Above that line, the exemption is not reduced. It disappears entirely, and the tax is calculated on the full purchase price from the first dollar.

Here is what that produces at three price points that are functionally identical to a buyer walking through the front door:

The tax bill barely moves across the first two rows. It jumps by roughly $10,000 across the third, triggered by a single dollar of contract price. Nothing else about the transaction changed. The house did not get bigger. The buyer's mortgage did not get more complicated. The exemption structure simply switched off.

Who actually pays it, and why that's a contract question, not a default

New York State law makes the buyer, referred to as the grantee, statutorily liable for the CPF tax. But liability under the statute and practice at the closing table are two different things. In Hamptons transactions, the CPF tax is frequently negotiated in the contract of sale, and it is common to see it assigned to the seller, split between both parties, or shifted based on how competitive the deal is. None of that is automatic. If the contract is silent or ambiguous about who covers the CPF tax, that silence becomes a negotiation on its own, often discovered later than either side would like.

For a seller pricing a home at $2,000,000 or just above it, this matters twice over. First, the buyer's total cash-to-close changes meaningfully depending on which side of the line the final contract price lands. Second, if convention in that particular deal has the seller absorbing the CPF tax, the seller's net proceeds take a bigger hit at $2,000,001 than at $2,000,000 for no reason connected to the home's value.

The other exemption: a full pass, not a partial one

There is a second exemption in Southampton's CPF structure that works differently, and it is worth knowing about even though it applies to a narrower group of buyers. The Town's First-Time Home Buyer Exemption, updated effective July 6, 2026, allows a qualifying buyer to avoid the CPF tax altogether rather than receiving a partial offset. To qualify, the buyer cannot have owned a primary residence, or been married to someone who did, at any point in the three years before closing. The buyer also cannot own a vacation or investment home anywhere else, and the property must become the buyer's primary residence.

As of that July 2026 update, the purchase price limit for improved property under this exemption is $1,960,455, calculated as 150% of a $1,306,970 benchmark figure. Household income limits also apply, tied to SONYMA guidelines. This exemption does not extend to vacant land, and it must generally be applied for before closing on the Town's prescribed form. For a qualifying first-time buyer purchasing near that price ceiling, this is a genuinely different mechanism than the $400,000 cliff exemption. It removes the tax entirely rather than shrinking the taxable base, and it disappears just as completely if the price or income limit is exceeded.

What this means if you're pricing or bidding near the line

If you are listing a Southampton property anywhere close to $2,000,000, the CPF exemption cliff is a pricing consideration, not just a closing detail. Listing at $2,050,000 instead of $1,995,000 does more than change the buyer's mortgage math. It changes which exemption structure applies at all, and depending on how the contract allocates the CPF tax, it can change what either side actually nets from the deal.

Buyers making offers just above $2,000,000 should ask their attorney to run the CPF calculation before signing, not after. The same applies to sellers setting an asking price near that threshold. A price reduction of a few thousand dollars to land at or under $2,000,000 can be worth more to a buyer than it costs the seller, once the exemption is restored.

The CPF tax does not travel alone. Buyers at $1,000,000 or above also owe New York's mansion tax, generally 1% of the purchase price and paid by the buyer. The state's own transfer tax, commonly 0.4% of the sale price, applies on top of that and customarily falls to the seller, though this too is negotiable. None of these taxes are new for 2026, but stacked together they represent a meaningful share of a transaction's closing costs, and the CPF exemption cliff is the one most likely to move unpredictably based on where the final contract number lands.

Where this gets filed

The CPF tax is paid at the time of closing and recorded with the deed at the Suffolk County Clerk's Office. The Peconic Bay Region Community Preservation Fund form, including its Schedule C list of specific exemptions, has to accompany that filing. Southampton's Community Preservation Office, which handles both the general CPF process and the First-Time Home Buyer Exemption applications, is located at 24 West Montauk Highway in Hampton Bays, and can be reached at 631-287-5720. Anyone applying for the first-time buyer exemption should plan to submit that application before closing rather than after, since the brochure describes it as the preferred timing.

A few questions that come up often

Does the $2,000,000 cliff apply to vacant land the same way? The unimproved land exemption works on the same all-or-nothing structure, but the exemption amount is smaller, $100,000 rather than $400,000, and the price ceiling for that exemption is set separately in the Town's CPF form.

Can a buyer and seller split the difference to avoid the cliff? Yes, in the sense that the contract price itself is negotiable. If both sides understand that $2,000,000 is a meaningfully different number than $2,000,001 for tax purposes, that becomes a legitimate point of discussion during offer negotiation, separate from the value of the house itself.

Is the first-time buyer exemption automatic once someone qualifies? No. It requires an application to the Town, generally submitted before closing, along with documentation of income, prior ownership history, and intended use as a primary residence.

Pricing strategy in Southampton has always meant more than comparing recent sales. It means understanding how the numbers around a sale, not just the sale price itself, behave once a contract crosses a specific line. If you are weighing where to set an asking price near that threshold, or you're a buyer trying to understand what a contract price actually costs you at closing, Kelly DiJorio can walk through the math with you before you're locked into a number.