The September 18 Deadline
Property owners who received Department of Finance notices flagging their units as potential non-primary residences have until September 18, 2026 to file exemption applications, according to DOF's extended deadline that superseded original August dates.
The extension applies to all owners who received DOF's 'You may be subject to...' notices for the pied-à-terre surcharge, which takes effect July 1, 2026. Conquest's analysis of DOF's July 2026 Supplemental Market Value Roll shows roughly 24,000 units citywide would owe the surcharge if classified as non-primary residences.
Manhattan condo and co-op owners face the steepest exposure. Units there would owe an average surcharge of $68,559, with the median hitting $53,665. The 4% rate applies to the full DOF market value once a unit crosses $1 million, not just the excess above the threshold.
What DOF Requires for Primary Residence
The surcharge applies only when a property fails to qualify as the primary residence of the owner, an immediate family member, or a tenant under a 12-month arm's-length lease. Family members include spouses, children, siblings, parents, grandparents, and grandchildren.
Primary residence status gets determined as of the January 5 taxable status date preceding each fiscal year. An owner who spent most of 2025 elsewhere but established primary residence by January 5, 2026 would qualify for the exemption in fiscal year 2026-27.
DOF has not yet published detailed documentation requirements for rebutting non-primary classification. Professional sources describe the process as 'self-certified' by owners, subject to DOF review and potential requests for supporting documents.
Consider a Manhattan co-op owner with a $1.8 million DOF market value. Without the primary residence exemption, they would owe $72,000 annually under the 4% rate. The same unit would face $94,500 if valued above $3 million when the 5.25% bracket applies.
Appeals and Payment Timeline
Owners get 30 days from a notice's transmission date to appeal DOF's non-primary determination. The first surcharge payments come due January 1, 2027, for fiscal year 2026-27.
Standard property tax abatements and exemptions do not offset the pied-à-terre surcharge. Entity owners face majority-interest look-through rules when determining primary residence eligibility.
The tax sunsets June 30, 2031, but condo and co-op owners should expect higher bills starting fiscal year 2028-29 when DOF revalues Class 2 properties closer to market prices and shifts them to the lower-threshold house schedule.
Check your property's DOF market value and potential surcharge exposure with Conquest's free calculator at piedaterretax.nyc before the September 18 deadline.