Westchester County, NY — Property Tax Underwriting Guide
New York · Annual market review
What this means for multifamily underwriting
Westchester has high effective rates driven primarily by school district overlays. Combined rates in high-cost districts (Scarsdale, Bronxville, etc.) far exceed the county average.
Transaction type breakdown
Westchester County assessment is conducted by individual city and town assessors. Many municipalities have moved toward full-value assessment; a recent above-assessment sale is strong market evidence.
Refinance does not affect assessed value.
Ownership change is market evidence; the assessor may update the assessed value at the next annual review.
Tax appeal information
Effective rate placeholder of 1.8% (18.0 mill) is a mid-county estimate. Westchester rates span roughly 1.4% to 2.5%+ depending on municipality and school district.
Guide review
County guidance last reviewed: June 15, 2026
Tax-rate scope: Tax-rate scope is not established as parcel-specific; confirm the parcel's taxing-authority stack.
Official sources: Westchester Tax Commission
Annual-market model is directionally accurate; millage requires per-municipality verification.
Parclio estimates are underwriting guidance, not legal or tax advice. Always verify millage rates, the seller's assessed value, and appeal deadlines with the county assessor or local counsel before relying on these numbers for a credit decision.
Run a tax reset estimate for Westchester County
Use Parclio's estimator to model the post-closing tax bill, NOI impact, DSCR change, and underwriting memo language for your next Westchester County deal.