This paper challenges the traditional view of the corporate tax as taxing corporate capital rather than the act of incorporating. Our model has no capital. Entrepreneurs pay to go public to diversify their risk. In discouraging incorporation, the tax keeps more entrepreneurs private and exposed to more risk. The tax falls primarily on high-skilled entrepreneurs and to a lesser extent on labor, who experience less demand for their services. The wage reduction also induces marginal entrepreneurs to set up shop and experience more risk. Hence, the answer to the titleâ€™s question is that the corporate tax taxes risk-sharing.