Marginal Effective Tax Rates on Physical, Human and R&D Capital

This paper presents marginal effective tax rates (METRs) for a number of physical and intangible assets and for a number of funding sources. The assets include machinery, buildings, inventories, investments in short-lived R&D (that is, investments whose returns last only a few years) and in long-lived R&D (whose returns last many years). Two human...