For decades, the New York “Mansion Tax” has been a frustrating rite of passage for individual homebuyers. Originally implemented in 1989, it levied an additional 1% tax on residential properties purchased for $1 million or more.

But in the current New York City real estate market, $1 million barely buys a modest one-bedroom apartment.

Now, individual buyers and sellers are facing a massive legislative overhaul. The New York State Senate and Assembly have released budget proposals that completely restructure the Mansion Tax for 2026. When you are keeping your down payment liquid in cash accounts with Betterment to be ready for the perfect co-op, these proposed changes will fundamentally alter your closing costs and negotiating power.

TL;DR: The Proposed 2026 NYC Mansion Tax Changes

Concept	Current Law	2026 Proposed Law (Effective June 1)
The Threshold	$1,000,000	Drops to $500,000.
Who Pays?	The Buyer pays by default.	Shifts to the Seller.
$500K – $1M Rate	0% (No tax)	1.425%.
$1M – $5M Rate	1.00% to 1.50%	1.425%.
$5M – $10M Rate	2.25%	3.675%.

Here is what individual buyers and sellers need to know about the proposed 2026 rules.

1. The Threshold Drops to $500,000

Under the current system, the 1% tax acts as a hard cliff: buy for $999,999 and you owe nothing; buy for $1,000,000 and you owe a $10,000 Mansion Tax.

The proposed 2026 legislation drops that threshold drastically, introducing a 1.425% tax on sales starting at just $500,000.

This means the tax will capture a vastly wider pool of transactions, ensnaring first-time homebuyers purchasing entry-level co-ops and smaller condos in Brooklyn and Queens that previously flew entirely under the Mansion Tax radar.

2. The Liability Flip: Sellers Foot the Bill

Historically, the default obligation for the Mansion Tax has always fallen on the buyer.

The new proposal completely flips the script. Under the proposed structure, the seller becomes primarily liable for paying the tax. While both the buyer and seller will still face joint and several liability (meaning the state can come after either party if it goes unpaid), the default obligation shifts to the seller’s side of the closing table.

What this means for you:

• For Sellers: This is a direct, unavoidable hit to your net proceeds. If you sell a Brooklyn brownstone for $1.5 million, you will suddenly be responsible for the 1.425% tax.
• For Buyers: This reduces your out-of-pocket cash requirements at closing, but you can guarantee that sellers will attempt to bake this new tax burden into higher listing prices.

3. The Progressive Rate Spikes

For high-net-worth individuals trading luxury properties, the proposed rate increases are incredibly steep.

Under current law, the Mansion Tax on a property between $5 million and $10 million is 2.25%. The Senate and Assembly proposals hike that rate to a staggering 3.675%.

If you sell a $10 million luxury condo under the new rules, the tax rate jumps from 2.25% to 3.675%, creating roughly $142,500 in additional tax liability that did not exist last year. For ultra-luxury properties exceeding $25 million, the proposed rate climbs from 3.9% up to 5.325%.

4. The June 1, 2026 Deadline

Timing is everything in real estate. If enacted, these proposed rates and rules would apply to any residential transfers or conveyances made after June 1, 2026.

If you are currently negotiating a deal, accelerating your timeline to close before June 1st could save (or cost) you tens of thousands of dollars, depending on whether you are sitting on the buyer’s or seller’s side of the table.

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Frequently Asked Questions

Does the NYC Mansion Tax apply to co-ops? Yes. Both the current law and the proposed 2026 legislation apply broadly across residential property types, including direct interests in single-family houses, individual condo units, and economic interests in cooperative (co-op) apartments.

Can the Mansion Tax be added to my mortgage? No. The Mansion Tax is a closing cost that must be paid upfront. It cannot be rolled into your standard mortgage loan, which is why individual buyers must budget for it separately alongside their down payment.

Is the Mansion Tax tax-deductible? Not immediately. When you pay the Mansion Tax, you cannot deduct it from your income taxes for that year. However, it is added to your property’s “cost basis,” which will help shield some of your capital gains when you eventually sell the property.