Among all the municipalities in Westchester County, White Plains stands alone in one important respect: its tax grievance deadline falls in January — not June like most other towns. This catches many homeowners off guard. If you own property in White Plains and have been waiting until spring to think about your assessment, you have already missed the 2026 window. But there is a clear path forward, and the time to prepare for 2027 is now.
The White Plains Grievance Deadline: January 1 – January 21
White Plains operates on a distinct assessment calendar from the majority of Westchester municipalities. Most Westchester towns hold their Grievance Day on the third Tuesday in June. White Plains closes its filing window on January 21 — a full five months earlier.
This means that White Plains property owners who want to challenge their assessment need to begin the process in the fall of the prior year — ideally by November or December. A certified appraisal typically takes 5–10 business days from inspection to report delivery. Add time for scheduling, weather-related delays common in winter, and the need to review the completed report before filing, and it becomes clear that waiting until January is cutting it dangerously close.
If you own property in White Plains, mark your calendar now: begin your tax grievance preparation no later than November of each year to ensure you are ready for the January filing window.
White Plains's Diverse Housing Stock — Why Property Type Matters
White Plains is the seat of Westchester County government and one of the most densely developed cities in the county. Its housing stock is extraordinarily varied — from single-family homes on tree-lined residential streets to high-rise condominiums in the downtown core, from garden-style apartment complexes to attached townhouses in planned developments.
This diversity creates a significant challenge for accurate mass assessment. A municipal assessor applying broad valuation factors across such varied property types will inevitably produce assessments that are too high for some properties and too low for others. Single-family homeowners in established neighborhoods, owners of older condominiums with high maintenance fees, and owners of properties with functional issues (unusual layouts, limited parking, proximity to commercial uses) are among those most frequently over-assessed.
The importance of property type in comparable selection cannot be overstated. A downtown White Plains condominium must be compared to other downtown condominium sales — not to sales of single-family homes in a residential neighborhood, and not to sales of condominiums in a different building with a different amenity profile or maintenance structure. Getting the comparable selection right requires detailed knowledge of the local market and rigorous appraisal methodology.
How to Prepare Before the Next January Window
The good news for White Plains homeowners who missed the 2026 deadline: you have time to prepare, and doing so thoughtfully can make a real difference in your outcome.
Step 1: Review your current assessment. Your assessment notice will show the assessed value your municipality has assigned to your property. Compare this to recent sales of similar properties in your area. If the implied market value seems higher than what comparable homes are actually selling for, you may have grounds for a grievance.
Step 2: Contact a certified appraiser in the fall. Reach out to Madison & Park Appraisal in October or November to schedule your inspection. This gives us time to complete the appraisal, gives you time to review it, and ensures you have a polished, USPAP-compliant report in hand well before the January deadline.
Step 3: File Form RP-524 with supporting documentation. The formal grievance complaint is filed with the White Plains Board of Assessment Review. A certified appraisal is the strongest evidence you can submit. Incomplete or unsupported filings are routinely denied.
Step 4: If denied, file a SCAR petition. If the BAR does not grant a satisfactory reduction, you can escalate to a Small Claims Assessment Review proceeding. At this stage, a certified appraisal is effectively essential. The hearing officer expects rigorous, professional evidence — not printouts or informal estimates.
Why a Certified Appraisal Is Your Strongest Tool
Across all Westchester municipalities, the most effective evidence in a tax grievance is a certified appraisal prepared by a licensed, credentialed appraiser. In White Plains specifically, where the property market is complex and the assessment calendar is unforgiving, having a professional appraisal prepared well in advance is particularly important.
At Madison & Park Appraisal, we hold the SRA designation — the highest professional credential in residential appraisal — and have completed thousands of appraisals across White Plains and Westchester County. Our reports are prepared to USPAP standards, structured to withstand scrutiny at BAR and SCAR proceedings, and delivered on a timeline that works for your filing schedule.
For a comprehensive overview of how the grievance process works across Westchester, visit our Guide to Property Tax Grievance in Westchester County. To learn more about our tax grievance appraisal services and request a quote, visit our Tax Grievance Appraisal page.
Don't let another January deadline pass without taking action. Contact us this fall to get ahead of it.