Picture two offers on the same home in Millburn Township. One buyer comes in at $1,999,000. Another, eager to win, offers $2,001,000. On paper, the second offer looks better by two thousand dollars. Under New Jersey's current transfer tax rules, it can leave the seller with roughly twenty thousand dollars less.
That is not a typo, and it is not a hypothetical. It is how New Jersey's mansion tax, officially renamed the Graduated Percent Fee, has worked since the law changed on July 10, 2025. For a town like Millburn, where Short Hills routinely trades above two million dollars and the township's own sale prices sit close enough to that line to matter, this is not an edge case buried in fine print. It is arithmetic that touches a meaningful share of the local market.
The Cliff, Not a Slope
For two decades, New Jersey's mansion tax was simple: any residential sale over one million dollars carried a flat 1% fee, and the buyer paid it. That changed with the 2025 amendment. The fee now scales with price, and the seller owes it.
Here is the schedule as it stands today:
| Sale Price | Fee Rate |
|---|---|
| $1,000,000 to $2,000,000 | 1% |
| Over $2,000,000 to $2,500,000 | 2% |
| Over $2,500,000 to $3,000,000 | 2.5% |
| Over $3,000,000 to $3,500,000 | 3% |
| Over $3,500,000 | 3.5% |
The part that trips up sellers who assume this works like income tax brackets: it does not. Federal tax brackets are marginal, meaning you only pay the higher rate on the income above the threshold. New Jersey's fee is flat across the entire sale price once you cross into a tier. Cross from $2,000,000 into $2,000,001, and the 2% rate applies to the whole amount, not just the dollar that pushed you over.
That is where the two-offer scenario above comes from. A sale at $1,999,000 owes $19,990 in tax. A sale at $2,001,000 owes $40,020. A two-thousand-dollar difference in price produces a twenty-thousand-dollar swing in what the seller owes at closing.
Why This Isn't a Rare Problem in Millburn Township
Mansion taxes tend to read as a wealthy person's problem, something that applies to a handful of trophy properties and not much else. That framing does not hold up in Millburn.
Over the three months ending May 2026, the median sale price in Short Hills was roughly $2.3 million, putting a large share of transactions squarely inside the second tier or higher, not brushing against it from below. In Millburn proper, trailing readings through the first half of 2026 have generally placed typical sale prices somewhere between roughly $1.2 million and $1.7 million depending on which months and which mix of homes get measured. That range sits mostly in the 1% tier, but it is close enough to the $2 million line that a well-positioned renovation, a bidding war, or a strong spring market can push a listing across it without anyone planning for it.
In a town where entry-level homes start well under a million dollars and estate properties clear three million, the mansion tax is not background noise reserved for the top of the market. It is a live variable for a wide band of sellers between those extremes, and it is one that arrives at the closing table whether or not anyone budgeted for it during listing.
The Burden Moved. The Negotiating Leverage Moved With It.
Before July 2025, there was a rough symmetry in New Jersey closings: sellers paid the standard realty transfer fee, buyers paid the mansion tax. That balance is gone. Sellers now carry both, and the size of the second one depends entirely on where the final sale price lands relative to a bracket line.
There is a detail in the law that matters more than it might first appear: the parties can still agree, by contract, to allocate the fee differently. The statute assigns legal responsibility to the seller, but nothing stops a buyer and seller from writing a different arrangement into the purchase agreement. In a market where a listing sits right at a threshold, that clause is worth more than most boilerplate in the contract.
The New Jersey Legislature passed this change as part of the fiscal year 2026 budget signed by Governor Phil Murphy on June 30, 2025, and it took effect ten days later. A grace period allowed contracts fully executed before July 10, 2025, to keep the old 1% rate if the deed recorded by November 15, 2025. That window closed months ago. Every Millburn listing on the market today falls under the current rules, with no transition relief left to claim.
What This Changes About How You Price and Negotiate
For a seller whose home is likely to land anywhere near $2 million, $2.5 million, or $3 million, the strategy shifts from "get the highest number" to "get the highest number after the fee." A few things follow from that:
Know your tier before you set a list price. A home that could reasonably sell between $1.95 million and $2.05 million is not a small pricing decision. It is the difference between owing 1% and 2% on the entire sale.
Model net proceeds, not gross price, when comparing offers. The offer with the higher headline number is not automatically the better one once the fee is factored in. This matters most in a bidding scenario where two offers straddle a bracket line.
Put the allocation question on the table early. Since the fee can be reassigned by contract, it is worth raising during negotiation rather than discovering the default rule at the closing table.
Check for an exemption before assuming the fee applies. Transfers between spouses, transfers between parents and children, transfers from an estate to a beneficiary, and transfers recorded within 90 days of a divorce decree are excluded. Most standard resale transactions will not qualify, but it is worth confirming with an attorney rather than assuming.
None of this replaces a conversation with a real estate attorney, who will calculate the exact figure and confirm whether any exemption applies to your specific transaction. What it does is change the questions worth asking before you sign anything, starting with where your expected sale price actually falls on that table above.
Frequently Asked Questions
Does the mansion tax still apply to buyers in Millburn? No. As of July 10, 2025, the legal obligation to pay the fee shifted entirely to the seller unless the purchase contract specifically states otherwise.
What happens if my home sells for exactly $2,000,000? The statute's language sets the first tier at "up to $2,000,000," meaning a sale at exactly that figure stays in the 1% bracket. One dollar more moves the entire sale into the 2% tier.
Is there still a grace period for the old 1% rate? No. The transition window required a contract fully executed before July 10, 2025, with the deed recorded by November 15, 2025. That period has passed, and current listings fall under the new tiered schedule with no exception remaining.
Pricing a home in Millburn or Short Hills was never just about comps and curb appeal. Now it means understanding exactly where your sale price lands on a fee schedule that does not forgive a rounding error. If you are weighing a listing price, comparing offers that sit close to a bracket line, or trying to figure out what you will actually walk away with after closing costs, Kristina Baez can help you run the numbers before you commit to a number. Let's Connect.
