This research investigate the influence of corporate governance mechanisms on the effective tax rate (ETR). The sample is 27 listed companies in the Indonesia Stock Exchange in 2010 – 2013. The results show that the board size, proportions of independent board, institutional ownership, and the internal audit committee has a significant effect on effective tax rate, while managerial ownership has no effect. This result indicates that efectiveness of corporate tax planning depend on firm corporate governance mecanism.
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