Working papers results

ABSTRACT This paper examines how companies’ capital structure is affected by the corporate income tax system. Our analysis employs confidential company-level corporation tax return data in the UK. Our main identification strategy is based on variation in companies␣ marginal tax rates due to the existence of kinks in the corporate tax rate schedule. Using a dynamic adjustment model of capital structure, we find a positive and substantial long-run tax effect on companies' financial leverage. We show that there are considerable discrepancies between estimates of taxable profits reported in tax return data and in financial statements and that the estimated tax effect on capital structure using financial statements is likely to be biased downward. We find that companies adjust their capital structures gradually in response to changes in the marginal tax rate. Moreover, we find that the external leverage of domestic stand-alone companies and of multinational companies responds strongly to corporate tax incentives

ABSTRACT This paper reassesses the relationship between tax structure and long run income, using as indicators of tax structure both a new series of implicit tax rates based on Mendoza et al. (1997) and tax ratios, adopting a dynamic panel estimation strategy, and explicitly accounting for cross-section dependence in the panel. When implicit tax rates are used, the paper shows, the link between tax structure and long run income per capita is not robust to the adoption of different assumptions on observable and unobservable heterogeneity across countries. When tax ratios are used, there is some evidence of a negative impact of labour taxation on long run income, but this result is shown to capture non-fiscal effects coming from the evolution of the labour share. Turning to the short run, the research presented here finds strong evidence of a positive effect on per capita income of a tax shift from labour and capital taxation towards consumption taxation, which provides support for fiscal devaluations.