Form RP-6584: Notification of County Equalization Rates Explained

Form RP-6584, officially titled “Notification of County Equalization Rates,” is a document issued by the New York State Department of Taxation and Finance’s Office of Real Property Tax Services (ORPTS). It’s used at the county level to formally communicate the equalization rates that have been established for the various cities and towns within a county for a given assessment roll year.

Equalization rates matter because assessment practices vary from one municipality to another. Some towns assess property at full market value, others at a fraction of it. Without a way to adjust for these differences, apportioning shared costs across municipalities — like county taxes, school district budgets that cross town lines, or special district charges — would be unfair to towns with higher assessment ratios. The equalization rate acts as a conversion factor so that everyone’s share is based on comparable, full-value figures rather than raw assessed values.

Form RP-6584 is the notice that puts those rates into the official record for a county. It typically lists each city and town within the county along with the equalization rate assigned to it for that roll year. This notification is generated after the state or county has calculated the rates based on sales data, market analysis, and other assessment review procedures.

Who Needs This Form

This form is primarily used by county real property tax services directors, county legislative bodies, and local assessors. It’s not something an individual homeowner fills out and submits — it’s an administrative notice that moves between government offices to keep the tax apportionment process accurate and transparent.

That said, town supervisors, school district officials, and anyone involved in calculating apportioned tax levies will want to reference this notification closely, since the rates listed directly affect how much each municipality owes toward shared costs. Property tax consultants, assessors’ offices, and local government finance staff are the most common users of this document.

When It’s Used

Form RP-6584 is issued annually, tied to each assessment roll cycle. Once equalization rates are finalized — whether through the standard state equalization process or a special or revised rate determination — the county needs a formal record showing what rates apply to which municipalities. This notification becomes part of the paper trail used when county taxes are apportioned among towns, and it often gets referenced alongside other assessment-related filings.

For instance, if a municipality has gone through court-ordered adjustments to its assessment roll, those changes might later be reflected in related filings such as Form RP-6609, which lists court-ordered adjustments in assessments. Similarly, corrections of errors and small claims adjustments tracked on Form RP-6610 can influence the assessed values that equalization rates are based on. Municipalities that also handle village-level assessments may need to cross-reference figures reported on Form RP-6603-V, which reports total assessed value of locally assessed properties for village purposes.

How to Get and Complete It

The form is available as a fillable PDF directly from the New York State Department of Taxation and Finance website. Since it has AcroForm fields built in, users can open it in a PDF reader and type information directly into the designated fields rather than printing it out and filling it in by hand.

Completing it generally involves entering the county name, the assessment roll year, and the equalization rate assigned to each municipality within that county. Because the data on this form feeds into tax apportionment calculations, accuracy matters — any error in a listed rate can throw off the amount a town or city owes toward shared county expenses. County assessment offices usually keep a copy on file alongside other roll-year documentation for auditing and reference purposes in future years.