The primary focus of the department is servicing the County in providing the highest professional quality programs available using state of the art technology. The framework of all programs is to manage the overall County tax system in a fair and equitable manner complying with the New York State Real Property Tax Law and the standards for real property assessment as set by the International Association of Assessing Officers.

The Real Property Tax Services Agency is mandated by the New York State Real Property Tax Law, and is responsible for preparing many assessment and tax documents. The department does its own data processing in-house and prepares and prints all tentative and final assessment rolls, tax rolls, bills, and receipts for all 16 towns, 12 of 17 school districts, and 8 of 9 villages in Ontario County. The Tax Mapping division maintains tax maps for all municipalities in the county, including 16 towns, 2 cities, and 9 villages.

The staff also prepares the county tax levy, assists and coordinates with town, village, and school levy preparations, provides training to all Board of Assessment Review members, processes property transfers, maintains several databases with historical parcel and ownership information, and assists property owners with information needs. We provide support to municipal assessing officials pertaining to the Real Property System software, assistance with revaluation projects, as well as training.

The Real Property Tax Services Agency is part of the Administrative Services Division of Ontario County, and provides information to many departments within the organization, while overseeing the system that provides funding for many of the county's public services. The total number of parcels in the county as of the year 2001 is more than 46,000 parcels and exceeds 6.2 billion dollars in assessment.