New York City is moving forward with a proposed pied-à-terre tax, targeting luxury second homes, as Mayor Zohran Mamdani and New York State Governor Kathy Hochul seek to address a significant budget deficit. This initiative comes as Mayor Mamdani has opted to withdraw a broader proposal to increase property taxes on a wider range of homeowners, a move that could have faced substantial political opposition. The tax proposal has already sparked controversy, notably drawing public criticism from hedge fund billionaire Ken Griffin, who reportedly threatened to reduce his business presence in New York. Despite the political tensions and skepticism from tax experts regarding its financial impact and effect on overall housing supply and affordability, the city is pressing ahead.

The concept of taxing second homes or vacant luxury properties is gaining traction in urban centers worldwide, from Vancouver and Toronto to London and Paris. These cities are increasingly implementing similar levies, often framed as a response to worsening housing affordability, rising rents, and the stark visual inequality of unused luxury apartments in prime neighborhoods. For instance, Vancouver’s “empty homes tax” and a federal “underused housing tax” aim to return properties to the long-term rental market, with net revenues purportedly reinvested into affordable housing initiatives. Paris is also considering steeper penalties for vacant housing, hoping to free up thousands of units.

Despite these global efforts, the effectiveness of such taxes in significantly boosting revenue or housing supply remains a subject of debate among experts. Thomas Brosy, a senior research associate at the Urban-Brookings Tax Policy Center, distinguishes between recurring property surcharges and one-time transaction taxes, noting their differing impacts on owner behavior. While New York’s proposal is an annual tax on non-resident second homes valued at $5 million or more, many international examples apply charges regardless of property price. Paul Cheshire, a professor of economic geography at the London School of Economics, suggests that policymakers often misdiagnose the core problem, arguing that the primary issue in “super cities” is constrained housing supply rather than a proliferation of second homes, which typically constitute a small fraction of the total housing stock.

New York City officials project the pied-à-terre tax could generate as much as $500 million annually. However, the city’s comptroller has presented a more conservative estimate, suggesting a realistic range of $340 million to $380 million. This lower projection accounts for potential behavioral changes by property owners, such as converting units to primary residences, renting them out, or selling them, as well as possible legal challenges. Abir Mandal of the Tax Foundation emphasizes that while revenue potential exists, it remains modest relative to broader housing needs, even in aggressive examples like Vancouver where vacancy-tax revenue is a small fraction of city finances. Evidence from cities like Vancouver and Paris indicates that while these taxes can raise some revenue and reduce vacancy rates, they generally do not lead to a significant reduction in overall rents or property prices, largely because the luxury housing market often operates independently from the broader housing market.

The broader economic impact of these taxes on the ultra-wealthy is also complex. Experts generally agree that a single tax policy change is unlikely to trigger a mass exodus of affluent buyers from global cities. Instead, such taxes tend to influence marginal investment decisions and contribute to cumulative burdens that, when combined with other high taxes and costs, might accelerate decisions for those with flexible footprints to seek lower-tax jurisdictions. Ultimately, the appeal of pied-à-terre taxes may lie more in their political symbolism than their fiscal power. By targeting a narrow, affluent segment of property owners rather than the middle class, these measures allow governments to be seen as addressing housing inequality and budget concerns without imposing broader tax increases on full-time residents.