Monroe County does not use one countywide grievance office or one date for every parcel. The assessing authority is the City of Rochester, a town, or in some cases an assessing village. Rochester's 2026 complaint deadline was March 17 at 8 p.m.; most county towns used May 26, the fourth Tuesday in May. Those regular 2026 windows are closed. The $249 FairPath owner-guided evidence packet remains available now for Monroe County property owners to organize the official record, owner-verified corrections, comparable sales, photographs, and source notes. A closed grievance window changes filing guidance, not access to the packet. FairPath does not file RP-524, select a requested value, appear before a Board of Assessment Review, or promise that a late filing will be accepted.
Assessment context: Begin by identifying the assessing unit rather than stopping at the Monroe County name. The county Real Property Portal provides parcel, assessment, tax, and historical-sale information, while the county publishes separate assessor contacts for Rochester and each town. Monroe's towns generally use a July 1 valuation date, March 1 taxable-status date, May 1 tentative roll, and July 1 final roll. Rochester instead uses February 1 for valuation and taxable status, March 1 for the tentative roll, and May 1 for the final roll. Assessment levels also vary materially among municipalities. Monroe's 2026 table lists, for example, Rochester at a 100 percent level of assessment while several towns are below 100 percent. Compare the assessed value, the municipality's level of assessment, the subject's inventory, and appropriately adjusted local sales rather than treating the tax bill or a raw countywide price as the appeal issue.
Filing process: For property outside Rochester, use Monroe County's assessor directory to find the correct city, town, or village office, then confirm its tentative-roll date, Grievance Day, hearing schedule, and accepted delivery method. New York generally uses Form RP-524 outside New York City and Nassau County. The form must reach the assessor or Board of Assessment Review by the applicable deadline; a postmark alone does not protect a late-arriving filing under the state guidance. A separately assessing village may require a second RP-524 and may use a different calendar. Rochester publishes its own annual RP-524 package. For 2026 it required an original signed hard copy received in City Hall Room 101-A by 8 p.m. March 17 and rejected fax or email submissions. Before the next cycle, preserve the notice, verify the current form and office, state the owner's value opinion and requested assessment carefully, and retain delivery proof.
Evidence to review: Build the evidence around the assessment date and the specific assessing unit. Obtain the subject's property record and flag measurable discrepancies such as living area, finished basement, number of units, garage, condition, lot dimensions, or an improvement that no longer exists. Select nearby sales that reflect the same municipality, neighborhood, property type, use, size, age, and condition, and document why each transaction is usable. Because Monroe publishes municipality-specific equalization rates and levels of assessment, keep assessed-value comparisons separate from market-value comparisons and show the calculation used. Dated photographs, inspection findings, contractor scopes, permits, and owner records can explain physical conditions that the public record misses. New York's RP-524 requires a value estimate and grounds for the complaint; a packet should organize the owner's facts without inventing either. If the property is in an assessing village, keep town and village records and deadlines visibly separated.
Current deadline guidance: 2026 closed: March 17 in Rochester; May 26 in most towns. The City of Rochester required original hard-copy RP-524 complaints by 8 p.m. on March 17, 2026. Monroe County towns generally used the fourth Tuesday in May, May 26, 2026, but a village that assesses property or a shared-assessor arrangement can use a different calendar. Confirm the assessing unit shown on the property record before relying on a date.
Rochester's assessment calendar is materially earlier than the ordinary town calendar. The city's 2026 form required receipt by March 17 at 8 p.m., while most towns used May 26.
Monroe County contains 21 assessing jurisdictions, and the county directory lists the responsible assessor by municipality. The county Real Property Tax Service supports those units but is not a substitute for filing with the correct local authority.
A village that conducts its own assessing can create a second assessment and a separate grievance. Confirm whether the village assesses property before assuming the town filing covers both records.
Municipal levels of assessment differ across Monroe County. A comparable analysis should use the correct local ratio and should not compare raw assessments across municipalities as though they share one assessment level.
Official filing authority: Local city, town, or village assessor and Board of Assessment Review. https://www.monroecounty.gov/property-assessorcontacts
Source: Monroe County Real Property Tax Service, Town and City Property Assessment Dates, https://www.monroecounty.gov/property-assessmentdates. Reviewed 2026-07-29.
Source: Monroe County Real Property Tax Service, Town Assessors and Tax Receivers, https://www.monroecounty.gov/property-assessorcontacts. Reviewed 2026-07-29.
Source: City of Rochester Bureau of Assessment, Contesting an Assessment, https://www.cityofrochester.gov/departments/finance-department/contesting-assessment. Reviewed 2026-07-29.
Source: New York State Department of Taxation and Finance, Grievance Procedures, https://www.tax.ny.gov/pit/property/contest/grievproced.htm. Reviewed 2026-07-29.
Source: Monroe County Real Property Tax Service, 2026 Equalization Rates and Levels of Assessment, https://www.monroecounty.gov/property-equalization. Reviewed 2026-07-29.