Check the assessment year before filing
Last checked September 5, 2026 against the official sources linked below. This guide covers filings during 2026; the assessment roll or resulting tax bill may belong to a later year. Check the current official notice before filing.
Informal review and a formal grievance are different steps
Yonkers lists September 15 for informal appeal submissions. The standing formal grievance period is November 1 through November 15. A conversation or informal submission should not be treated as a formal Board of Assessment Review filing.
In 2026, November 15 falls on Sunday. November 16 is the expected next-business-day deadline under New York's general rule, but a cycle-specific notice still needs confirmation. Plan to complete delivery by Friday, November 13 rather than depend on a last-day interpretation.
Check the tentative roll and the property's market value
The annual calendar places the tentative roll on November 1. Confirm the parcel and challenged assessment on that roll. Do not substitute an older final roll merely because it is easier to find online.
Yonkers' property viewer lists the valuation date as July 1 before the tentative roll publication. Organize sales and condition evidence around the applicable date. When the assessed number differs from full market value, use the correct current ratio to explain the comparison.
Choose comparable property rights and condition
Distinguish a condominium, a detached home and a small multifamily property before looking at prices. A lower-priced home with inferior condition or a materially different location can require significant explanation.
Prepare a concise grid with sale dates, prices, size, use and condition. Describe meaningful differences such as renovation, parking, views and usable space. Identify record errors with documents and photographs that a reviewer can match to the parcel.
December evidence does not extend November filing
The city calendar gives December 15 for additional BAR information and personal-hearing requests from owners who filed a complaint. That is a later evidence step, not a replacement for the November complaint deadline.
Use the city’s current filing packet to confirm signatures, representative authorization and delivery requirements. Keep proof of receipt and a complete copy. The Yonkers calendar applies to city assessments, not all of Westchester County.
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