Tax Policy, Investment, and Firm Financing: Evidence from the U.S. Interest Limitation
Abstract
This paper studies the impacts of limiting interest deductions on firms’ investment andfinancing choices using U.S. tax data. The 2017 law known as the Tax Cuts and Jobs Act
(TCJA) implemented an interest limitation for big, high-interest firms. Using an event study
design comparing big and small high-interest firms, we rule out economically significant
impacts of the interest limitation on investment and leverage, and find evidence that the
interest limitation led firms to increase their equity issuance. A triple difference design that
accommodates size-varying impacts of other TCJA policy changes yields similar results, as
does a regression discontinuity design focusing on marginal firms that are just large enough to
face the interest limitation. Our results indicate many firms do not use debt as their marginal
source of financing and provide evidence consistent with capital structure models with fixed
leverage adjustment costs. Furthermore, our results suggest limiting interest deductions is
unlikely to have large impacts on investment or to address concerns about rising corporate
debt levels.