This paper analyzes intersectoral and intertemporal efficiency effects of the Tax Reform Act of 1986 using a general equilibrium model that considers impacts of taxes on the allocation of capital across industries, assets, sectors and time. The model pays close attentiona to capital adjustment dynamics. We find that the 1986 reform worsened the intertemporal efficiency of resource allocation by increasing marginal effective tax rates on various uses and types of capital. This negative efficiency effect is more that offset, however, by postivie effects from an improved intersectoral allocation of capital and a reduction of labor market distortions.