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The Finance Base
FY2027 budget

Mamdani’s Proposed 9.5% NYC Property Tax Increase: What It Meant and What Happened

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The 9.5% figure was a proposed relative increase in New York City’s average property-tax rate—not a 9.5-percentage-point jump and not a tax increase enacted in the May 2026 budget. The February FY2027 Preliminary Budget treated it as a fallback revenue option, estimating $3.7 billion for the fiscal year. By May, Mayor Zohran Mamdani’s Executive Budget had dropped the citywide rate increase.

What did the proposed 9.5% increase mean?

It meant raising the average property-tax rate from 12.283% to 13.450%, according to the New York City Independent Budget Office’s March 2026 testimony. The change between those rates is about 9.5% relative to the starting rate; it is not an increase of 9.5 percentage points. The IBO’s FY2027 Preliminary Budget testimony also notes that individual properties are taxed according to four state-designated classes, so the average rate does not describe every property’s rate.

The cited budget documents do not establish a specific added dollar amount for an individual owner or renter. The February analysis also said Council enactment would have been required and that the allocation of a hypothetical increase among the four property-tax classes was unclear, as reported in the New York State Comptroller’s 2026 financial-plan review.

Why did the preliminary budget include it?

In February 2026, the Mayor’s Office presented the increase as one option available if the city did not receive new revenue authority. The Preliminary Budget estimated that the proposed rate change would raise $3.7 billion in FY2027. That was a forecast, not money already collected. See the Mayor’s Office announcement of the FY2027 Preliminary Budget.

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Why did the proposal draw opposition?

The New York City Council opposed the increase, arguing that it could worsen affordability and burden homeowners, small businesses, renters and utility bill payers. That was the Council’s policy assessment, not a published calculation of how much any particular household would pay. The Council’s position appears in its April 2026 response to the preliminary budget.

Did Mamdani drop the property-tax increase?

Yes. The May 2026 FY2027 Executive Budget omitted the proposed citywide rate increase. Mamdani said the administration had chosen to balance the budget without a property-tax increase; the Comptroller described the May plan as a complete reversal of the preliminary proposal. The Mayor’s statement appears in the May 12 Executive Budget transcript, and the change is discussed in the NYC Comptroller’s comments on the FY2027 Executive Budget.

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How did the budget paths differ?

Budget path or measure Scope Revenue estimate Status in May 2026
February Preliminary Budget proposal Proposed increase in the average citywide property-tax rate $3.7 billion in FY2027, estimated by the Mayor’s Office Removed from the Executive Budget
May Executive Budget Budget balanced without the proposed citywide property-tax increase No revenue estimate for that increase, because it was omitted Adopted as the administration’s revised budget proposal
Separate high-value-property surcharge Targeted at certain properties worth more than $5 million and owned by non-residents $500 million annually beginning in FY2027, projected by OMB and reported by the Comptroller Included in the May Plan; distinct from the citywide rate proposal

The Comptroller reported the $500 million projection for the separate surcharge in its Executive Budget review. The two proposals have different scopes: one would have raised the average rate broadly, while the other targeted a defined category of high-value, non-resident-owned properties. The available official sources do not provide a basis for comparing their effects on a particular tax bill.

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