New York City Mayor Zohran Mamdani has granted homeowners an extra month to apply for exemptions from his controversial new tax on high-value second homes after city officials confused more than 900,000 property owners with incomplete information about who would actually face the levy.

Extended Deadline Follows Widespread Confusion

Homeowners across the five boroughs now have until September 18 to apply for exemptions from the pied-a-terre tax, nearly a month longer than the original August 21 deadline. City officials acknowledged the extension was necessary after the Department of Finance published a supplemental market value roll on July 24 listing over 900,000 properties without explaining that the vast majority would not be subject to the tax. The city initially failed to clarify that only 17,000 homeowners who received official notices needed to take action.

The confusion prompted multiple updates to the city’s website between July 24 and the following Saturday. Officials eventually clarified that only property owners who received letters stating they may be subject to the surcharge need to apply for exemptions if they believe their property qualifies as their primary residence.

Tax Targets Wealthy Second Home Owners

The pied-a-terre tax, which took effect July 1, imposes annual surcharges on high-value New York City properties worth more than 5 million dollars that are not the owner’s primary residence. Individual condominium and cooperative units face the tax if valued at 1 million dollars or more. The state legislature passed the measure in May as part of the budget, which Democratic Governor Kathy Hochul signed into law on May 28. The tax applies during the 2026-27 and 2027-28 property tax years.

Mamdani announced the new levy on April 15 in a video filmed outside hedge fund manager Ken Griffin’s 238 million dollar penthouse on Billionaires Row, specifically naming Griffin as an example of wealthy second-home owners the tax would target. Griffin later called the video creepy and weird during a May 6 appearance at the Milken Institute Global Conference.

Business Leaders Warn of Economic Impact

Real estate and business leaders opposed the tax from the start, warning it could drive investment away from New York City at a time when the commercial real estate market faces ongoing challenges. Despite these objections, state lawmakers approved the measure with support from the Democratic majority. The tax represents one of Mamdani’s signature policy initiatives since taking office, part of his broader effort to increase revenue from wealthy property owners to fund city services and programs.