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Mamdani’s campaign tax promises and the later FY2027 budget are not the same package. The original headline taxes depended on state action; the mayor’s May 2026 budget announcement instead emphasized savings, state support, a proposed tax on certain second homes and a proposed change to a City business-tax credit. Their revenue figures are estimates or administration-reported budget measures—not proof of money collected.
What is Mamdani’s tax plan?
The answer depends on which point in the budget process you mean. During the campaign, Mamdani promoted two headline tax changes: a two-percentage-point increase in New York City personal income tax for people earning more than $1 million, and an increase in New York State’s top corporate tax rate from 7.25% to 11.5%. These involve different taxes and different levels of government.
By the March 24, 2026 preliminary-budget analysis, the Independent Budget Office (IBO) described a proposed City personal income-tax increase that would move the top rate from 3.876% to 5.876% for individuals with incomes above $1 million. The IBO estimated that it could raise $3 billion annually if the State passed it. That is a forecast conditional on legislation, not revenue already raised.
The IBO also described a less-preferred property-tax alternative: increasing the overall rate from 12.283% to 13.450%. This was an alternative in the preliminary-budget discussion, not the same proposal as the campaign’s millionaire tax.
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Can New York City raise taxes without Albany?
Not all of these taxes are under City control. The IBO states, “Any changes to PIT require State legislation.” That applies to the proposed City personal income-tax rate increase: although the tax is a City tax, New York State sets its rate.
The campaign’s corporate proposal also required state action. It concerned the State’s top corporate rate, not the separate City business corporation tax that corporations operating in the City may also face. Sullivan & Cromwell’s November 2025 legal analysis says changing the State corporate franchise tax requires an amendment by the State Legislature.
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The City does have authority to set its overall property-tax rate, but the IBO said the proposed increase would require City Council agreement. The distinction matters: a mayor can put a tax proposal forward, but that does not mean the mayor can enact every tax change alone.
What changed in the FY2027 budget picture?
In its May 2026 FY2027 executive-budget announcement, the Mayor’s Office described a package built around savings, new revenue, state support and investment. It reported the following figures and proposals:
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| Measure | Figure reported | Status and source |
|---|---|---|
| Gap-closing savings | $1.77 billion across FY2026 and FY2027 | Reported by the Mayor’s Office in its May 2026 executive-budget announcement; this is not a tax-revenue figure. |
| State support and actions | $4 billion | Reported by the Mayor’s Office in May 2026; the announcement groups support and actions together. |
| Pied-à-terre tax | $500 million in annual revenue | Mayor’s Office projection in May 2026 for a tax on certain non-primary residences; not a collection total. |
| Proposed reduction to the UBT tax credit | $68 million | Mayor’s Office projection in May 2026, described as a proposal to work with the City Council; not revenue already collected. |
This executive-budget announcement did not simply restate the campaign’s millionaire and corporate tax promises. It foregrounded a second-home tax and a proposed reduction in the unincorporated business tax (UBT) credit, alongside savings and state support. It is a later budget proposal and announcement, not evidence that all measures were enacted or that the projected revenue came in.
Will Mamdani’s tax plan raise enough revenue?
There is no single established answer in the figures available here. In its March 2026 preliminary-budget analysis, the IBO forecast gaps of $535 million in FY2026 and $5.939 billion in FY2027, and said the administration’s revenue projections were more optimistic than its own. Those were preliminary forecasts, not the final FY2027 adopted budget outcome.
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The NYC Comptroller’s comments on the preliminary FY2027 budget also identified differences in expected receipts across tax categories. The Mayor’s Office subsequently announced a revised executive budget with savings, state actions and additional revenue proposals. These documents describe different forecasts and budget stages; their figures should not be added together as if they were confirmed receipts.
The $3 billion annual IBO estimate for the proposed personal income-tax change is conditional on State approval. The Mayor’s Office’s $500 million annual pied-à-terre projection and $68 million UBT-credit estimate are also projections. None of these figures, on its own, demonstrates that a budget gap has been closed in cash.
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How would the pied-à-terre tax work in practice?
The Associated Press reported on August 12, 2026, that the proposed tax would apply to certain homes that are not their owners’ primary residences, with different value thresholds by property type:
- One-, two- and three-family homes valued above $5 million.
- Condos and co-ops valued at $1 million or more.
The value threshold is only one part of determining whether a property qualifies. Officials would also need to establish whether it is a primary residence and identify who owns or occupies it. AP reported that trusts and limited liability companies (LLCs) can obscure those details, creating verification and administration questions. That is a practical challenge to resolve; it does not by itself show that the tax cannot be administered.
What happened to the proposed millionaire and corporate taxes?
The campaign’s two headline tax changes should be understood as proposals requiring state legislation, not automatic mayoral actions. The March 2026 preliminary-budget analysis later discussed a specific personal income-tax proposal and a separate City property-tax alternative. The May 2026 executive-budget announcement, in turn, highlighted different revenue proposals. These are stages and components of a changing budget debate, not one enacted package.
The sources cited here do not establish how many wealthy residents or businesses would leave the City because of these proposals. A precise migration claim would require evidence directly measuring the effect of this particular plan; the budget forecasts and legal analyses do not supply that estimate.
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- A proposal identifies an intended policy; it is not the same as enacted law.
- A revenue forecast estimates what a measure could raise under stated assumptions; it is not a receipt.
- A budget announcement reports the administration’s plan and figures; it does not by itself establish final implementation or collections.
- A forecast gap belongs to a particular budget stage and fiscal year; it should not be treated as the final outcome after later revisions.
The central questions are therefore both political and administrative: whether Albany and the City Council approve the relevant measures, whether revenue estimates hold up, and how the City verifies eligibility for a tax tied to ownership and primary residence.
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