Next point in taxation will be Dividend Yields and Risk-Adjusted Returns. The first who investigated this relationship was Brennan (1970). He stated that using capital asset pricing model (CAPM) a security’s pre-tax excess return is linearly and positively related to its systematic risk and to its dividend yield. In other words, a higher pre-tax return compensates investors for the tax disadvantage of dividends. The two known empirical tests of the Brennan model are those of Black and Scholes (1974) and (1979) – presents conflicting results. Black and Scholes did not found the evidence of tax effect, in contrary Litzenberger and Ramaswamy concluded that returns are positively related to dividend yield. Ross, Westerfield and Jaffe told the next : “It is surprising that the results of such uniformly high-quality research can be so contradictory. One can only hope that the ambiguities will be cleared up in the future.”