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In this paper, we apply partial adjustment model in order to study the effects of economic, demographic, insurance and other factors on targeted income of Iran is Social Security Organization for the period of 1961 – 2001. Our findings show some variables such as bureaucracy, costs of changes, habits, organizational and institutional constraints would delay reaching the targeted income. The estimated elasticties imply the variables such as minimum wages, number of insurers, and social security tax, would speed up reaching the targeted income. To increase the effects of these factors, an increase in labor intensity of product, capital, and output of economic sectors, are suggested.