A new computable general equilibrium model is used to predict the effects of tax rate changes on employment and other macrovariables in California. The model is dynamic in accounting for both migration and investment. The relative strength of migration, labor force participation, and investment in causing taxrate-decrease-induced growth is examined. The model is used to contrast expected effects of a tax rate increase with and without migration and investment. among the states. Attracting migrants by cutting state taxes gives states a way to increase labor supply that the United States does not have. Similarly, there is reason to believe that capital can be quite mobile among the states. Thus, state tax cuts could engender larger labor supply responses and more investment than federal tax cuts, and therefore state tax cuts could be closer to self-financing than federal tax cuts would be.There are two chief offsetting effects. The first is that capital markets are national so that state tax policy cannot affect interest rates or the overall national level of investment. The second is that state taxes are deductible against federal taxes, so some of the benefits of a state tax rate decrease accrue to the United States rather than to residents of the state.To find the sum of all these effects requires a comprehensive general equilibrium model. In this article we use a computable general equilibrium (CGE) model of the state of California to evaluate two types of tax cuts, a cut in the Personal Income tax (PIT) rates and a cut in the Bank and Corporation tax (B&CT) rates.A CGE model is a set of equations that describes the economic activities of consumers, producers, government, and traders in the markets for factors of production, output, exports, and imports. A CGE model requires that quantities supplied and demanded in each market be equilibrated by market-clearing prices. There is a long history of using CGE models to evaluate national tax policy (Shoven and Whalley 1984), and there are several CGE models of the California economy (Berck, Robinson, and Goldman 1991;Despotakis and Fisher 1988;Hoffman, Robinson, and Subramanian forthcoming;Robinson, Subramanian, and Geoghegan 1993; Smith 1994). 1 These models of the California economy are derivatives of national CGEs and are not detailed enough in the modeling of government or factor mobility to be used to model tax rate changes. The California Department of Finance (DOF), with assistance from these authors, constructed a new CGE model of California. It is called the Dynamic Revenue Analysis Model (DRAM) (Berck, Golan, and Smith 1996). The structure of DRAM is very similar to the other CGE models of 400 / PETER BERCK, ELISE GOLAN, AND BRUCE SMITH State Tax Policy, Labor, and Tax Revenue Feedback Effects / 401