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Non-Technical SummaryCapital structure adjustments can be used to reduce the total tax burden on company investment since the taxation of the return on equity and debt capital differs in most countries. At the corporate level, interest payments reduce taxable profits while such a deduction is not feasible in the case of equity financing. At the shareholder level, effective tax rates on dividend and interest income differ as well. Therefore, the relative tax benefits of different sources of finance are supposed to have an impact on financing decisions.Theory suggests that both corporate profit tax and personal capital income taxes shouldbe considered in order to analyze the tax impact on capital structure choices.Since previous literature mainly focuses on the taxation of corporate profits, empirical evidence with respect to the possible impact of personal capital income taxation on capital structure choices is still scarce. Therefore, this paper aims at analyzing the effects from different taxation of equity and debt on capital structures of European firms while taking into account both personal and corporate income taxation. For the empirical analysis we employ a rich panel of firm-level financial accounting data of companies located in 23 European countries, taken from the AMADEUS data base. In contrast to other recent papers, we focus mainly on stand-alone companies. Furthermore, we collect detailed information about the tax systems of the considered countries during the period from 2000 until 2005.The empirical results suggest that a higher tax benefit of debt has the expected significant positive impact on companies' financial leverage. Additional analysis confirms that debt ratios are affected by personal income taxation: the level of dividend taxes has a positive impact on the debt to assets ratio, whereas the taxation of personal interest income negatively affects corporate leverage. In addition, we find evidence that the capital structures of smaller companies react more heavily to higher tax benefits of debt. In contrast, this tax benefit only has a minor impact on the financial decisions of parent companies belonging to a group of affiliated firms.
Zusammenfassung (Summary in German)