Ali Hussein Samadi - Department of Economics, Faculty of Economics, Management and Social Sciences, Shiraz University, Shiraz, Iran
Shohreh Nasirabadi - Department of Economics, Faculty of Economics, Management and Social Sciences, Shiraz University, Shiraz, Iran

T he main aim of this paper is analyzing the relationship between tax evasion and the monitoring expenditure on tax collectionin Iran. For doing so, we have used a simulation model for determining optimal level of monitoring expenses on tax collection. The results showed that, a greater portion of government expenses must be allocated to monitor the tax collection, although do this reduces tax evasion, but have a negative effect on economic growth. Thus, instead of  increasing monitoring expenses in line with reducing tax evasion, it is better to reduce taxes rate in a way that in addition not to decrease in motivation of economic agents activity, it also causes decrease in motivation of tax evasion.

Keywords: Tax Evasion, Tax Rate, Monitoring Expenditure on Tax Collection, economic growth, Iran. JEL Classification: C۰۲, C۱۱, C۶۱, H۲۶, O۴۰