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Opinion of the Court
discriminate against foreign commerce. We are not convinced, however, that this description adequately characterizes the relevant features of the Iowa statute. It is true that if a subsidiary were located in another State, its earnings would be subject to taxation by the Federal Government and by the other State (assuming that the State was one of the great majority that impose a corporate income tax).22 This state and federal tax burden might exceed the sum of the foreign tax that a foreign subsidiary would pay and the tax that Iowa collects on dividends received from a foreign subsidiary. But whatever the tax burdens imposed by the Federal Government or by other States, the fact remains that Iowa imposes a burden on foreign subsidiaries that it does not impose on domestic subsidiaries.23 We have
no reason to doubt the assertion of the United States that "[i]n evaluating the alleged facial discrimination effected by the Iowa tax, it is not proper to ignore the operation of other
22 Corporate income is taxed by 45 States and by the District of Columbia. See 1 J. Hellerstein, State Taxation: Corporate Income and Franchise Taxes ¶ 1.6 (1983).
23 If one were to compare the aggregate tax imposed by Iowa on a unitary business which included a subsidiary doing business throughout the United States (including Iowa) with the aggregate tax imposed by Iowa on a unitary business which included a foreign subsidiary doing business abroad, it would be difficult to say that Iowa discriminates against the business with the foreign subsidiary. Iowa would tax an apportioned share of the domestic subsidiary's entire earnings, but would tax only the amount of the foreign subsidiary's earnings paid as a dividend to the parent.
In considering claims of discriminatory taxation under the Commerce Clause, however, it is necessary to compare the taxpayers who are "most similarly situated." Halliburton Oil Well Cementing Co. v. Reily, 373 U. S. 64, 71 (1963). A corporation with a subsidiary doing business in Iowa is not situated similarly to a corporation with a subsidiary doing business abroad. In the former case, the Iowa operations of the subsidiary provide an independent basis for taxation not present in the case of the foreign subsidiary. A more appropriate comparison is between corporations whose subsidiaries do not do business in Iowa.
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