New York City Mayor Zohran Mamdani gave property owners an additional month to escape his controversial luxury home tax after the city’s finance department triggered widespread confusion by publishing a list of 900,000 properties without clarifying that only a fraction would actually face the new levy.

Deadline Extension Follows City Messaging Debacle

Homeowners now have until September 18 to apply for exemptions from the pied-a-terre tax, which took effect July 1. The original deadline was August 21. City officials said the extension applies to anyone who received Department of Finance notices stating they “may be subject to” the surcharge. The finance department acknowledged the extra time was necessary after property owners struggled to determine whether their homes qualified as primary residences exempt from the tax.

The confusion peaked on July 24 when the city published a supplemental market value roll listing more than 900,000 properties without explaining that the vast majority would not face the tax. The city’s webpage offered minimal guidance, stating only that the roll “includes, but is not limited to” properties potentially subject to the surcharge. By Thursday, officials updated the page clarifying that only homeowners who received mailed notifications needed to take action. A Saturday update revealed the Department of Finance had sent surcharge letters to just 17,000 homeowners.

Tax Targets Second Homes Worth Millions

The state legislature passed the pied-a-terre tax in May, imposing annual surcharges on high-value New York City homes worth more than $5 million that are not the owner’s primary residence. Individual condominium and cooperative units face taxation if valued at $1 million or more. The tax applies to one-family, two-family, and three-family properties during the 2026-27 and 2027-28 property tax years. Democratic Governor Kathy Hochul signed the measure into law on May 28 despite warnings from real estate and business leaders that the levy could drive investment away from the city.

Mayor’s Controversial Rollout Drew National Attention

Mamdani announced the tax on April 15 in a video filmed outside hedge fund manager Ken Griffin’s $238 million penthouse on Billionaires’ Row, naming Griffin specifically as an example of wealthy second-home owners the tax would target. Griffin later called the video “creepy and weird” during a May 6 discussion at the Milken Institute Global Conference, revealing he watched it three times. The mayor’s office did not respond to requests for comment about the deadline extension or the confusion surrounding the property list.