The Measurement of Impacts of Tax Rates on the Risk Level of Listed Viet Nam Banking Firms During 2009-2011

The emerging stock market in Viet Nam has been developed since 2006 and affected by the financial crisis 2007-2009. This paperwork analyzes the impacts of tax policy on market risk for the listed firms in the banking industry as it becomes necessary. First of all, by using quantitative and analytical methods to estimate asset and equity beta of total 9 listed companies in Viet Nam banking industry with a proper traditional model, we found out that the beta values, in general, for many institutions are acceptable.Second, under 3 different scenarios of changing tax rates (20%, 25% and 28%), we recognized that there is not large disperse in equity beta values, estimated at 0,109, 0,108 and 0,107. These values are low and acceptable.Third, by changing tax rates in 3 scenarios (25%, 20% and 28%), we recognized equity beta mean value has positive relationship with the increasing levels of tax rate.Finally, this paper provides some outcomes that could provide companies and government more evidence in establishing their policies in governance.