A key variable of interest to policy makers is the efficiency with which a tax agency's production process works. Until recently, the absence of comparable data across countries on tax administration has made the comparative analysis of tax agencies impossible. The recent compilation of data by the Organisation of Economic Cooperation and Development on administrative performance across countries has now provided this information. This article uses these data for the years 2007-2011, together with a novel three-step estimation strategy that utilizes data envelopment analysis (DEA) and stochastic frontier analysis (SFA), to determine the relative efficiency of tax agencies in their use of inputs. Our third stage results indicate that 13 of the 28 countries in our sample are relatively efficient at collecting any of the three types of tax revenues (personal income, corporate income, and value-added taxes). Overall, the average efficiency scores indicate that countries should be able to collect their current level of revenues with approximately 10-16 percent less inputs. James Alm is a Professor and Chair in the

Standard-Nutzungsbedingungen:Die Dokumente auf EconStor dürfen zu eigenen wissenschaftlichen Zwecken und zum Privatgebrauch gespeichert und kopiert werden.Sie dürfen die Dokumente nicht für öffentliche oder kommerzielle Zwecke vervielfältigen, öffentlich ausstellen, öffentlich zugänglich machen, vertreiben oder anderweitig nutzen.Sofern die Verfasser die Dokumente unter Open-Content-Lizenzen (insbesondere CC-Lizenzen) zur Verfügung gestellt haben sollten, gelten abweichend von diesen Nutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte. www.econstor.eu This paper analyzes the effect of changes in structural progressivity of national income tax systems on observed and actual income inequality. Using several unique measures of progressivity over the 1981-2005 period for a large panel of countries, we find that progressivity reduces inequality in observed income, but has a significantly smaller impact on actual inequality, approximated by consumption-based GINIs. We show empirically that the differential effect on observed vs. actual inequality is much larger in countries with weaker legal institutions. Substantial differences in inequality response to changes in top vs. bottom rates are also uncovered. The paper discusses implications of these results for flat tax policies. Terms of use: Documents in D I S C U S S I O N P A P E R S E R I E S JEL Classification:H2, I3, J3, O1, O2

In this paper we use a panel of 189 countries to describe the salient trends that have emerged in national personal income tax systems spanning the twenty five year period from 1981 to 2005. Using complete national income tax schedules, we calculate actual average and marginal tax rates at different income levels as well as time-varying measures of structural progressivity and complexity of national tax systems. We show that frequent alterations of tax structures have reduced tax rates at higher levels of income and diminished the overall progressivity and complexity of national tax systems; however, the degree of this change varies considerably across countries. We also find that the relationship between the tax rates and revenue is positive for high income countries; however, the strength of the relationship declines with weaker institutions and lower levels of economic development.

Denvil Duncan is assistant professor in the School of Public and Environmental Affairs at Indiana University. His current research interests include personal income taxes and their effect on individual behavior, particularly labor supply and tax evasion. Some of his work in this area explores the impact of tax-induced behavioral responses on income inequality. He is also interested in international tax mimicry and the effect of tax policy on economic growth.

Standard-Nutzungsbedingungen:Die Dokumente auf EconStor dürfen zu eigenen wissenschaftlichen Zwecken und zum Privatgebrauch gespeichert und kopiert werden.Sie dürfen die Dokumente nicht für öffentliche oder kommerzielle Zwecke vervielfältigen, öffentlich ausstellen, öffentlich zugänglich machen, vertreiben oder anderweitig nutzen.Sofern die Verfasser die Dokumente unter Open-Content-Lizenzen (insbesondere CC-Lizenzen) zur Verfügung gestellt haben sollten, gelten abweichend von diesen Nutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte. www.econstor.eu Motivated by the observation that access to evasion opportunities is distributed heterogeneously across the labor market, this paper examines the extent to which labor supply elasticities with respect to tax rates depend on such evasion opportunities. We first set up a theoretical model to formally show that labor supply responses depend on access to evasion. The model is then tested in a lab experiment in which all participants undertake a real-effort task over several rounds. Subjects face a tax rate, which varies across rounds and are required to pay taxes on earned income. The treatment group is given the opportunity to underreport income while the control group is not. We find zero labor effort responses to tax rates in the control group and positive statistically significant adjustments in the treatment group; suggesting that both groups indeed react differently to taxes. Terms of use: Documents in D I S C U S S I O N P A P E R S E R I E S