INTRODUCTION Cloyd et al. (2003b) (hereafter CMW) investigate the following primary research question: Do firms experience a positive stock price reaction upon announcing they are moving their corporate headquarters from the United States to a tax haven? In these inversion transactions, if the present value of the expected tax savings exceeds the nontax costs, at least on average, then the inversion announcement should cause a positive market reaction. However, CMW point out that inverting may involve substantial nontax costs. The policy-based motivation is as follows. If corporate inversions are valued by the market and save the corporations money, then other firms will follow suit, and it is likely that the U.S. government will need to impose new tax rules to discourage inversions. However, if the inversions do not tend to save companies money, then their use will decline without government intervention. Using an event-study methodology on a sample of 20 inverting firms, CMW are unable to reject the null hypothesis that the inverting firms do not experience abnormal returns, against the alternative of positive abnormal returns. In fact, the firms experience negative announcement period abnormal returns, on average, although not significantly different from zero. This null result is surprising both because there appears to be large tax savings from the inversions and two other concurrent studies (Desai and Hines 2002; Seida and Wempe 2002b) do find some evidence of positive returns to corporate inversions. Overall, while the research question is relevant and interesting, it is difficult to reach solid conclusions from an event study with only 20 firms. The small sample size, perhaps, partially explains why the conclusions across the concurrent studies in this area differ. In addition, the relatively small number of firms undertaking voluntary corporate inversions— the entire population is only the 20 firms—is direct evidence that there may be hidden costs from inversions. The importance of CMW is the suggestion that it might be premature to conclude that there are large benefits to inverting.
Read full abstract