What Is a Mansion Tax? How It Works in Every State That Has One
A "Mansion Tax" is a colloquial term for an additional real estate transfer tax levied on high-value properties. Originally introduced in New York in 1989 to target $1 million+ luxury homes (which were considered mansions at the time), the tax has since been adopted by various states and municipalities under different names and structures.
Why Do States Have a Mansion Tax?
State and local governments use these luxury transfer taxes as a way to generate significant revenue from a small percentage of high-value transactions. The funds are often allocated to specific public initiatives. For instance, New York directs portions of its tax to the MTA (transit authority), while Los Angeles (Measure ULA) legally earmarks its massive tax revenue specifically for affordable housing production and homelessness prevention programs.
"Cliff" Taxes vs. Marginal Brackets
The defining characteristic of how much a mansion tax will cost you depends on its mathematical structure:
- The Cliff Effect (NY, NJ, LA): In a cliff structure, the moment the purchase price hits the threshold (e.g., $1 million), the tax rate applies to the entire purchase price, not just the amount over the threshold. For example, buying a $999,999 home triggers $0 in mansion tax, but a $1,000,000 home triggers a $10,000 tax.
- Marginal Brackets (CT, WA): In a marginal structure, similar to federal income tax, the higher rate applies only to the portion of the price that exceeds the threshold. This eliminates the abrupt penalty of crossing a specific price point.
State-by-State Overview
Because these are local laws, they vary wildly in terms of who pays (buyer vs. seller), what types of properties are taxed (residential only vs. commercial), and the rates applied.
- New York: Paid by the buyer. Starts at 1% for $1M properties, capping at 3.9% for $25M+. Calculate NY Tax
- New Jersey: Paid by the seller (as of July 2025). Starts at 1% for $1M properties, capping at 3.5% for $3.5M+. Calculate NJ Tax
- Connecticut: Marginal conveyance tax surcharge of 2.25% on the portion exceeding $800,000. Calculate CT Tax
- Washington State: Graduated marginal Real Estate Excise Tax (REET) hitting 3.0% on portions over $3.025M. Calculate WA Tax
- Los Angeles (Measure ULA): Paid by the seller. Extreme "cliff" tax hitting 4% at $5.3M and 5.5% at $10.6M. Applies to commercial and residential. Read LA Guide | Calculate LA Tax
- San Francisco: High marginal transfer taxes maxing out at 6% for properties over $25M. Calculate SF Tax
Disclaimer: The information provided in this guide is for educational purposes only and does not constitute legal or tax advice. Please consult with a qualified real estate attorney or tax professional regarding your specific transaction.