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Two well-noted phenomena of recent decades are the increasing concentration of personal income and the declining rate of corporate profitability. This paper investigates to what extent these two trends have a common explanation extent these two trends have a common explanation-shifting of income to the personal tax base from the corporate tax base caused by the generally declining difference between personal tax rates and corporation income tax rates. This paper presents evidence that a substantial amount of income shifting has in fact occured since 1965, based on time-series regression analyses that reveal that an increase in corporate tax rates relative to personal rates resulted in an increase in reported personal income and a drop in reported corporate income, even after controlling for corproate use of debt finance and for the amount of corporate assets. We focus on one mechanism for shifting--changing the form of compensation for executives and other workers, such as between wage compensation and greater use of stock options. The potential importance of income shifting requires a reinterpretation of both the efficiency and distributional consequences of of changes in the tax structure.