One of the unintended consequences — or benefits, depending on perspective — of New York's pied-à-terre tax is that it has begun functioning as an unofficial state auditor, uncovering potential tax fraud among wealthy homeowners.

The tax targets secondary residences: if a homeowner declares their New York City property as a second home relative to a primary residence owned out of state, they may be liable for the pied-à-terre surcharge, depending on the property's value. However, if that individual actually resides full-time at the New York City address while filing income taxes in another state or registering vehicles out of state to reduce tax and insurance costs, that constitutes tax fraud. The incentive to misrepresent residency is substantial: New York City residents face some of the highest combined state and local income tax rates in the United States, with top earners paying over 14 percent when city and state levies are combined — a burden many seek to avoid by claiming domicile in lower-tax states such as Florida.

The pied-à-terre tax has placed potential tax evaders in a difficult position. They can either continue claiming their New York City home as a secondary residence and pay the surcharge, or come forward, refile income taxes and update vehicle registrations to reflect their actual place of residence in the five boroughs — thereby subjecting themselves to New York's income tax rates and insurance premiums. New York Governor's Office is now scrutinizing individuals who may have been committing fraud all along. Residency disputes have long been a focus of New York's tax enforcement: under state law, an individual's domicile — their permanent legal home — determines tax obligations, and New York's Department of Taxation and Finance has historically pursued high-profile residency audits of wealthy individuals who relocate on paper but maintain substantial ties to the city.

"Hard-working New Yorkers pay taxes that fund our schools, roads, transit, and public safety. The pied-à-terre tax was designed to ensure people who can afford luxury second homes, but don't pay New York income taxes, are still contributing to the city they benefit from," Jen Goodman, director of rapid response at the governor's office, told Fortune.

"If you've been falsely claiming to be a non-resident in order to cheat the system, it's time to come clean — or our Department of Tax and Finance will take action to ensure you pay your fair share."

A spokesperson for New York City Mayor Zohran Mamdani confirmed that the Mayor's Office supports the governor's initiative.

"Mayor Mamdani worked alongside Governor Hochul and partners in Albany to pass the pied-à-terre tax so that we can fund cleaner parks, safer streets, and other critical investments across the five boroughs," said Matt Rauschenbach.

"We are committed to ensuring that every New Yorker who owes the pied-à-terre tax pays it — and helping those who don't file for an exemption," Rauschenbach continued. "We share the Governor's goal of ensuring that everyone claiming a tax benefit or exemption is actually supposed to be receiving it."

A Tax Will Be Levied Either Way

Governor Hochul and Mayor Mamdani jointly proposed the pied-à-terre tax in April, presenting it as a means to close New York City's budget gap without imposing additional burdens on everyday residents. The measure targets luxury second homes in New York City valued at $5 million or more, authorizing the city to impose an annual surcharge on non-New York City residents. The tax was projected to generate at least $500 million per year in recurring revenue.

"If you can afford a $5 million second home that sits empty most of the year, you can afford to contribute like every other New Yorker," Hochul said at the time of the proposal.

Mamdani introduced the tax in a Tax Day video, describing it as a mechanism to ensure that wealthy individuals contribute what they owe while aligning the budget with the administration's commitment to working New Yorkers facing rising costs in the city.

Four months after its introduction, the tax is producing effects beyond closing the budget gap. Fortune was the first publication to report on this unintended consequence: the tax is serving as an ad hoc residency auditor, identifying individuals who register vehicles out of state to circumvent New York's high insurance rates while living and driving in the city full-time. A similar dynamic is now surfacing with income taxes.

Hochul's office has indicated it is monitoring for potential tax fraud emerging through the exemption process. Property owners seeking to avoid the surcharge must demonstrate that the home in question is their primary residence — documentation that can just as easily reveal the opposite: an individual who resides in the city full-time but has filed taxes in another state to avoid New York tax obligations.

According to sources familiar with the matter, the governor's office is actively investigating potential tax fraud arising from the new tax. New York's Department of Tax and Finance routinely conducts audits of state residents.

Substantial Penalties on Both Sides

The penalties associated with both sides of this trade-off are severe enough that updating one's paperwork may appear inexpensive by comparison.

On the vehicle insurance side, driving without valid New York insurance coverage can result in a traffic court fine of up to $1,500, plus an additional $750 civil penalty to reinstate a revoked driver's license. Being caught with a fraudulent registration or license plate carries even steeper consequences: a first offense is classified as a misdemeanor, while a second offense within ten years becomes a class E felony, punishable by up to four years in prison and a fine of $5,000, or double the amount gained through the fraud — whichever is greater.

Income tax residency fraud carries its own set of penalties. A misdemeanor conviction for tax fraud results in a financial penalty of $10,000 for individuals and $20,000 for businesses, in addition to any back taxes owed. More serious cases carry far harsher consequences: criminal tax fraud in the first degree is a felony that can carry up to 25 years in prison and a fine of up to $100,000, or double the amount of tax underpaid, whichever is greater. Unlike a one-time insurance fine, back taxes also accrue interest for every year filed in the wrong state.

A Controversial Rollout

The tax rollout faced criticism from the start. Some argued the measure effectively doxxed individuals by exposing their names and addresses — notwithstanding that property tax records are publicly accessible in most U.S. cities and have been part of the public record in New York City since 1830.

A supplemental list compiled assessed property values alongside owners' addresses, encompassing nearly 960,000 entries. The city ultimately mailed letters to 17,000 homes, with approximately 10,000 recipients estimated to be subject to the tax.

According to NY1 reporter Bernadette Hogan on X, of the 17,000 letter recipients, roughly 7,000 have initiated exemption applications and 2,600 have submitted them thus far.