Paul Krugman wrote an interesting blog on corporate tax incidence a couple of days ago for the New York Times. The essence of his argument is threefold.
Second, the argument makes little sense when so many corporate profits are now based on the exploitation of monopoly trading rights backed up by intellectual property law. He uses IT and pharmaceutical companies as an example, where excess profits appear to be prevalent. It is his, clearly argued and logical argument that corporation tax incidence falls largely on these excess profits.
Assume this is true. Then we should tax those economic rents alone, not all profits. As Mirrlees suggests.