Official Standards of IAAO
Downloads
Guide to Assessment Administration Standards 
View (Posted January 2013)
Standard on Assessment Appeal View (Approved January 2013)
Standard on Automated Valuation Models (AVMs) View (Approved Sept 2003)
Standard on Contracting for Assessment Services View (Approved Dec 2008)
Standard on Digital Cadastral Maps and Parcel Identifiers View (Approved Jan 2012)
Standard on Facilities, Computers, Equipment, and Supplies View (Approved Jan 2003)
Standard on Manual Cadastral Maps and Parcel Identifiers View (Approved Aug 2004)
Standard on Mass Appraisal of Real Property View (Approved April 2013)
Standard on Oversight Agency Responsibilities View (Approved July 2010)
Standard on Professional Development View (Approved January 2013)
Standard on Property Tax Policy View (Approved Jan 2010)
Standard on Public Relations View (Approved July 2011)
Standard on Ratio Studies View (Approved April 2013)
Standard on Valuation of Personal Property View (Approved Dec 2005)
Standard on the Valuation of Properties Affected by Environmental Contamination View (Approved July 2001)
Standard on Verification and Adjustment of Sales View (Approved Nov 2010)
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Recent updates:
Standard on Mass Appraisal of Real Property View (Approved April 2013)
Standard on Ratio Studies View (Approved April 2013)
International Association of Assessing Officers (IAAO) maintains technical standards that reflect the official position of IAAO on various topics related to property tax administration, property tax policy, and valuation of property including mass appraisal and related disciplines. These standards are adopted by the IAAO Executive Board.
IAAO assessment standards represent a consensus in the assessing profession. The objective of the IAAO standards is to provide a systematic means by which assessing officers can improve and standardize the operation of their offices. The IAAO standards are advisory in nature and the use of, or compliance with, these standards is purely voluntary. If any portion of these standards is found to be in conflict with the Uniform Standards of Professional Appraisal Practice (USPAP) or state laws, USPAP and state laws shall govern.
IAAO technical standards are intended to guide property tax assessment officials, tax policy analysts, and administrators. Similar issues arise in any nation’s property tax systems. IAAO standards can provide guidance internationally. However, certain sections of these standards apply primarily to the United States and Canada, where the power to tax property is assigned to state, provincial, or territorial governments.
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IAAO allows reproduction of technical standards for personal use, educational purposes, property tax hearings, legislative development, as a supplement to local guidelines and standards, and for public information purposes. The content of IAAO technical standards are subject to change. Current official versions of technical standards are available only from IAAO. When citing a technical standard in other documents it is advisable to include the date the referenced standard was approved and a link to the current version on the IAAO Web site. IAAO also recommends reviewing references to IAAO technical standards annually to ensure that citations are still applicable.
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Technical Standards Committee
The Technical Standards Committee supports the mission and goals of IAAO by developing and maintaining technical standards of professional practice. The committee responds to inquiries about technical issues contained within technical standards. The committee's role is to ensure that IAAO maintains a leadership role by providing professional standards for the industry.
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