On the optimal progressivity of the income tax code

This paper computes the optimal progressivity of the income tax code in a dynamic general equilibrium model with household heterogeneity in which uninsurable labor productivity risk gives rise to a nontrivial income and wealth distribution. A progressive tax system serves as a partial substitute for missing insurance markets and enhances an equal distribution of economic welfare. These beneficial effects of a progressive tax system have to be traded off against the efficiency loss arising from distorting endogenous labor supply and capital accumulation decisions.Using a utilitarian steady state social welfare criterion we find that the optimal US income tax is well approximated by a flat tax rate of 17.2% and a fixed deduction of about $9,400. The steady state welfare gains from a fundamental tax reform towards this tax system are equivalent to 1.7% higher consumption in each state of the world. An explicit computation of the transition path induced by a reform of the current towards the optimal tax system indicates that a majority of the population currently alive (roughly 62%) would experience welfare gains, suggesting that such fundamental income tax reform is not only desirable, but may also be politically feasible.     

Dividend and capital gains taxation under incomplete markets

Motivated by the Jobs and Growth Tax Relief Reconciliation Act (JGTRRA) of 2003, the effects of capital income tax cuts are investigated in an economy with heterogeneous households and a representative, mature firm. Dividend tax cuts, contrary to capital gains tax cuts, lead to a decrease in investment and capital. This is because they increase the market value of existing capital and households require a higher return to hold this additional wealth. In line with empirical evidence, the model predicts substantial increases in dividends and stock prices. Overall, the tax cuts lead to a welfare reduction equivalent to a consumption drop of 0.5%.     

Taxation and the optimal constraint on corporate debt finance: why a comprehensive business income tax is suboptimal

The tax bias in favour of debt finance under the corporate income tax means that corporate debt ratios exceed the socially optimal level. This creates a rationale for a general thin capitalization rule limiting the amount of debt that qualifies for interest deductibility. This paper sets up a model of corporate finance and investment in a small open economy to identify the optimal constraint on tax-favoured debt finance, assuming that a given amount of revenue has to be raised from the corporate income tax. For plausible parameter values, the socially optimal debt-asset ratio is 2–3% points below the average corporate debt level currently observed. Driving the actual debt ratio down to this level through limitations on interest deductibility would generate a total welfare gain of about 5% of corporate tax revenue. The welfare gain would arise mainly from a fall in the social risks associated with corporate investment, but also from the cut in the corporate tax rate made possible by a broader corporate tax base.     

Taxing multinationals in a world with portfolio flows and R&D: Is capital export neutrality obsolete?

This paper examines recent claims that capital export neutrality no longer serves as an effective principle for the taxation of income from foreign direct investment, due to the large and growing role played by portfolio capital in financing investment and to the recognition that R&D is an important determinant of international trade and investment. In our evaluation of these claims, we find capital export neutrality appears robust. Because both domestic and foreign activities may be financed with portfolio capital, and they both produce goods that compete in the world economy, there is no compelling reason to grant a lower tax to foreign income alone. Regarding the promotion of R&D or the entry of new competitors, cutting the tax on foreign income may be no more effective than cutting the tax on domestic income. A second focus of the paper is to calculate what the residual U.S. tax rate on active foreign income actually is. Based on 1990 data this rate is negative if foreign income is defined appropriately.     

Taxes and stabilization in contemporary macroeconomic models

The role of proportional and procyclic labor income taxes for automatic stabilization with stochastic productivity is analyzed in a contemporary macroeconomic model based on imperfect competition. The importance of short-run nominal wage rigidity for the effectiveness of progressive taxes on labor income for stabilizing output and raising household welfare is examined in a model that yields complete analytical solutions with stochastic output shocks. Increasing the procyclicity of labor income tax rates raises welfare with and without rigid nominal wages in the model economy. With fully flexible prices and wages, a positive covariance between the distortionary tax rate and productivity reduces the volatility of production and employment. This effect disappears under nominal wage rigidity, although progressive taxation can still raise welfare by reducing the distortion caused by a proportional labor tax. With rigid nominal wages and flexible consumer goods prices, payroll taxes levied at rates that rise with output can serve as automatic stabilizers. JEL Code E62 · H20     

Income Taxation and Finite Horizons in a Human Capital Model

We address the issue ofcapital vs. labor income taxation in an overlapping generationsmodel with a positive externality in the human capital production.We compare the performance of the economy in the steady stateunder different tax policies. Three results are obtained. First,the size of the tax revenue required strongly affects the optimal(welfare maximizing) capital-labor income tax portfolio. Inparticular, a zero physical capital income tax rate need notbe optimal. Second, the way in which the finite life cycle issplit between the working and the retirement period also matters.And third, the size of the externality in the human capital productionalso affects the optimal income tax rate mix.     

Altruism, incomplete markets, and tax reform

We compute the welfare effects of different revenue-neutral tax reforms that eliminate capital income taxation in two general equilibrium models calibrated to the U.S. economy. In our dynastic model, the reform with the largest welfare gain is the one that eliminates all income taxation and increases the consumption tax to 35%; 75% of the population alive at the time of the reform benefit from it. Individuals use intervivos transfers and bequests to redistribute the long-run benefits. In a pure life-cycle economy that lacks this redistribution technology, we find that the same reform would benefit only 9% of the population.     

Human capital and optimal positive taxation of capital income

This paper analyzes optimal linear and non-linear taxes on capital and labor incomes in a life-cycle model of human capital investment, financial savings, and labor supply with heterogenous individuals. A dual income tax with a positive marginal tax rate on not only labor income but also capital income is optimal. The positive tax on capital income serves to alleviate the distortions of the labor tax on human capital accumulation. The optimal marginal tax rate on capital income is lower than that on labor income if savings are elastic compared to investment in human capital, substitution between verifiable and non-verifiable inputs in human capital formation is difficult, and most investments in human capital are verifiable so that education subsidies can directly reduce the tax wedge on learning. Numerical calculations suggest that the optimal marginal tax rate on capital income is substantial.     

Assessing the international spillover effects of capital income taxation

Changes in capital taxes by one economy spill onto other economies with internationally mobile capital. We evaluate these impacts using a two-region, intertemporal general equilibrium model. The foreign economy's unilateral reduction in corporate income taxation has positive but small effects on U.S. welfare. In contrast, unilateral reductions in personal income taxation impose large negative spillovers. The differences result from CIT being source-based and PIT residence-based. The CIT cut reduces tax burdens to U.S. residents who invest abroad, while the PIT cut reduces foreigners' tax burdens only. Through general equilibrium adjustments neglected in simpler models, the PIT cut lowers U.S. residents' welfare.     

Welfare Consequences of Gradual Disinflation in Emerging Economies

Emerging economies display considerable inequality in monetary asset holdings, rendering the recent disinflation nontrivial. Using a small open‐economy model with uninsurable idiosyncratic risk, this paper shows that a gradual decline of 12% in the quarterly inflation rate leads to an aggregate welfare gain of 0.40% in consumption equivalent terms. The poor gain less than the economy on aggregate, despite holding a more inflation‐prone financial portfolio. This is because unequal cash holdings make inflation tax payments of the poor much smaller than those of the rich. When inflation tax revenues finance redistributive transfers that provide insurance, cross‐sectional gains become even more dispersed.     

Investment income taxes and private equity acquisition activity

Utilizing a novel identification strategy, we uncover evidence that reducing the investment income tax rate increases acquisition activity by private equity acquirers. Applying a difference-in-difference methodology, we find that acquisitions sponsored by private equity firms nearly doubled following the investment income tax rate reductions associated with the Taxpayer Relief Act of 1997 and the Jobs and Growth Tax Relief Reconciliation Act of 2003. We attribute our findings to private equity fund structures and managing partners’ ability to capture the expected benefit of lower capital gains tax rates. These findings are robust to controlling for target shareholders’ tax incentives, as well as firm, industry, and macroeconomic factors possibly influencing acquisition activity.     

Optimal International Taxation and Growth Rate Convergence: Tax Competition vs. Coordination

Optimal international taxation and its implications for convergence in long run income growth rates are analyzed in the context of an endogenously growing world economy with perfect capital mobility. Under tax competition (i) the residence principle will maximize national welfare; (ii) the optimal long run tax rate on capital incomes from various sources will be zero in all countries; and (iii) long term per capita income growth rates will be equalized across countries. Under tax coordination, (i) becomes irrelevant while (ii) and (iii) will continue to hold. In other words, optimal tax policies are growth-equalizing with and without international policy coordination. This revised version was published online in July 2006 with corrections to the Cover Date.     

Double taxation and tax deduction: A comparison

This paper examines the impact on capital flows and economic welfare of alternative domestic income tax policies toward foreign income tax payments, in a setting of international tax competition. In particular, we compare a system of full deductibility from taxable income with one that provides no allowance for foreign taxes. It is found that the walfare of the capital exporting country is always greater without deductibility than with it. Contrary to intuition, moreover, equilibrium capital flows and world income are also greater without deductibility. These findings extend the results of a recent contribution by Bond and Samuelson who compared tax deductibility with tax credits. The results underscore the importance of the general equilibrium approach for the proper evaluation of important tax policy alternatives.     

开征物业税对我国房地产市场的影响分析

开征物业税有利于转变政府职能,使政府的税源更依赖于环境的建设,而不是过多地依赖于土地出让;有利于减轻开发商在房地产开发初期的资金压力,降低其经营风险,吸引更多的开发商进入,促进房地产业的竞争,增进消费者福利;有利于鼓励和实现房地产的自住性需求;有利于抑制房地产市场的投资和投机行为。但由于开征物业税会导致房地产开发成本和进入壁垒降低,也可能造成房地产开发过度,产生房地产泡沫。     

Human capital risk in life-cycle economies

The aggregate effects of market incompleteness are studied in a model where agents face idiosyncratic, uninsurable human capital investment risk. Using a life-cycle model with a version of a Ben-Porath (1967) human capital accumulation technology, stationary equilibria of calibrated cases are analyzed in which risk arises from specialization risk and career risk. With career risk only, stationary equilibria resemble those studied by Aiyagari (1994), and the impact of uninsurable idiosyncratic risk is relatively small. With a significant amount of specialization risk, however, stationary equilibria are severely distorted, with human capital about 57 percent as large as its complete markets counterpart.     

对个人住房开征物业税的几个判断及效应预测

对个人住房开征物业税是关乎国计民生的大事。本文认为,开征物业税之前需要进一步理顺中央与地方的财政关系;开征后的物业税收入要用于满足地方公共财政支出的需要;物业税开征后的征管质量取决于对个人住房信息的掌握和政府各部门间的横向合作。物业税开征与地区房地产价格弱相关,与全国房地产价格无关;与股市题材炒作相关,与资本市场发育无关;与当地居民收入和福利相关,与辖区外居民效用无关。     

How Firms Make Capital Expenditure Decisions: Financial Signals, Internal Cash Flows, Income Taxes and the Tax Reform Act of 1986

This paper empirically assesses the determinants of future net capital expenditures for a broad cross-section of COMPUSTAT firms from 1973 to 1989. We explore three general categories of factors expected to affect investment: (1) external equity financing, (2) internally generated accounting information, and (3) tax incentives. We find that external financing and information plays a role in that both positive stock returns and equity issuances indicate future increases in investment. The results suggest that high stock prices not only lower the cost of capital, but also signal good investment opportunities. Accounting information about internal sources and uses of funds are also important in the investment decision. In particular, net income and depreciation are positive indicators of future investment while there is a tradeoff between the payment of dividends and investment. Further, positive changes in available cash liquidity also motivate future investment. While taxes are not important in the investment decision on average, we find that firms with previously higher income taxes invested substantially more in 1985 and 1986. This coincides with the repeal of the investment tax credit and the accelerated depreciation schedules in the Tax Reform Act of 1986. We view this as evidence that federal tax policy in the 1980's induced firms with high income tax obligations to accelerate capital expenditures just before the favorable tax treatment of capital expenditures was eliminated.     

From Destination- to Origin-Based Consumption Taxation: A Dynamic CGE Analysis

A switch from the current destination-based value-added taxation to an origin-based consumption tax will not be neutral in a world economy with international capital mobility and overlapping generations. This paper evaluates the macroeconomic and welfare effects of such a multilateral reform in a two-region, intertemporal general equilibrium model. The analysis isolates and quantifies income effects due to changes in generations' tax burdens, factor price repercussions and initial asset price adjustments, as well as efficiency effects that arise from endogenous labor supply and short run savings responses in a numerical simulation exercise.     

Public capital, public pension, and growth

This paper constructs an endogenous growth model with overlapping generations, whose engine of economic growth is productive public capital. We investigate a public policy under which the government allocates tax revenue between investment in public capital accumulation and public pension provision. We show that increasing the share of spending on public pensions always reduces economic growth. However, we show numerically that public pension provision improves social welfare and there exists an optimal share of spending on public pension provision unless the value of the time discount factor of the government is sufficiently high. Moreover, we show that in an economy facing an aging population, an increase in social security provision for the old rather than an increase in public investment can be preferable from the viewpoint of social welfare.