This paper examines the role of personal income taxes (PIT) in corporate investment decisions. Since PIT reduce consumption and increase cost of labor, investment decisions can be affected because of the inevitable link of production input factors. Using data on PIT in 27 European countries and three within-country approaches, we find that personal income taxes substantially reduce investment. The magnitude is comparable to the effect of corporate taxes. We also document that the PIT-investment relationship can be explained by increased labor costs and by reduced consumption due to higher PIT.