Tax morale is recognized as one of the most important variables to understand the levels of compliance obtained in most countries. This paper analyzes the impact of occupational status, income level, behavioral, political and psychological factors on tax morale level of Portuguese taxpayers. A sample of 1,514 Portuguese individuals was obtained from the European Values Study (EVS) developed in 2008. A factor analysis was used to extract the underlying dimensions of tax morale. Multiple regression analysis was used to explore the relationship between the dimensions revealed by factor analysis, occupational status, income level, and tax morale. The findings suggest that occupational status, income, political democratic system, individual satisfaction, trust in others, and individual′s identification with Portugal have a strong significantly effect on tax morale.