Abolishing the Tax‐Free Threshold in Australia: Simulating Alternative Reforms*

This paper examines the role of the tax‐free income tax threshold in a complex tax and transfer system consisting of a range of taxes and benefits, each with its own taper rates and thresholds. Considering a tax and benefit system with benefit taper rates whereby some benefits are received by income groups other than those at the bottom of the distribution, it is suggested that a tax‐free threshold is not a necessary requirement to achieve redistribution. Four alternative policy changes, each involving the elimination of the tax‐free threshold in Australia and designed to achieve approximate revenue neutrality, were examined using the Melbourne Institute Tax and Transfer Simulator. A range of implications were examined, including labour supply responses to tax changes and the effects of policy changes on inequality and social welfare. The results demonstrate that it is possible to eliminate the tax‐free threshold under approximate overall revenue and distribution neutrality, but that it is impossible to improve labour supply incentives at the same time. In order to achieve improved incentives, either revenue or distribution neutrality has to be sacrificed.     

Payroll Taxes and the Decision to be Self-Employed

This paper investigates and quantifies the role of payroll taxes in the decision to be self-employed. It examines the effects of introducing into the labour market a payroll tax which taxes employers, but which exempts the self-employed. It exploits two changes in the tax legislation to confirm that it is changes in legislation and not other sector specific trends that are driving the results. Our findings suggest that payroll taxes do indeed influence the decision to be self-employed, with the probability of self-employment increasing as taxes on employees increase and vice versa. Furthermore, there appear to be declines in the return to self-employment caused by the tax, possibly due to inefficient allocation of labour towards self-employment.     

Some Equity and Efficiency Considerations of International Tax Competition

The paper uses a dynamic 2-country equilibrium model with imperfections in the labour market calibrated for the US and EU economy to investigate dynamic efficiency and equity aspects of international tax competition. We focus on tax policy where governments can only decide on the levels of corporate and labour taxes, given a constant share of government consumption and transfers in GDP and a constant VAT rate. We find that the welfare effect of a tax shift from capital to labour depends heavily on the distortionary nature of labour taxes. In contrast to existing results we find substantial positive international spillover effects of corporate tax reduction in one country, with long term gains outweighing short term losses. Results are very different, however, if one goes beyond the representative agent framework. According to our results, a tax switch is most likely not Pareto improving since net wages tend to decline in both regions even in the long run.     

Decomposing Inequality Changes: Allowing for Leisure in the Evaluation of Tax and Transfer Policy Effects

In this paper, we present two alternative methods of accounting for changes in leisure time in decomposing the inequality effects of tax and transfer policy changes. Three components are identified: tax policy, labour supply responses to tax policy changes and other population effects. The methods are used to decompose inequality changes in Australia between 2001 and 2006. Inequality is first defined in non‐welfarist terms as a function of disposable income: the independent judge places no value on leisure. Then, this is modified to allow for evaluations using a weighted geometric mean of disposable income and leisure. This is seen to modify the evaluation of changes in important ways. The results are found to differ from those obtained using a ‘welfarist’ evaluation in terms of money metric utility, where separate labour supply effects cannot be isolated.     

The Effective Tax Burden of Companies and of Highly Skilled Manpower: Tax Policy Strategies in a Globalised Economy*

Company taxes and taxes on highly skilled labour both influence the attractiveness of a particular region as a location for investment. We measure the effective tax burden on capital investment and on highly qualified labour in 33 locations across Europe and the United States. We then correlate both types of tax burden in order to study the different tax policy strategies applied in different countries. We find that effective tax rates on companies and on highly skilled employees are closely correlated for a number of countries. Ireland and most new EU Member States impose relatively lower taxes on capital investment than on highly skilled manpower. Conversely, in the US, companies are taxed heavily but the effective tax rate on highly skilled employees is moderate.     

The Elasticity of Taxable Income in New Zealand*

This paper reports estimates of the elasticity of taxable income with respect to the net‐of‐tax rate for New Zealand taxpayers. The relative stability of the New Zealand personal income tax system, in terms of marginal rates, thresholds and the tax base, provides helpful conditions for deriving these estimates. The elasticity of taxable income was estimated to be substantially higher for the highest income groups. Changes in the timing of income flows for the higher income recipients were found to be an important response to the announcement of a new higher rate bracket. The marginal welfare costs of personal income taxation were consistent across years, being relatively small for all but the higher tax brackets. For the top marginal rate bracket of 39 per cent, the welfare cost of raising an extra dollar of tax revenue was estimated to be well in excess of a dollar. Implications of the findings are that: disincentive effects of high top marginal rates can be substantial even when labour supply responses are small; the welfare costs of increases in top marginal tax rates can be high; and announcement effects of tax policy changes can lead to considerable income shifting between time periods.     

Redistribution as Social Insurance and Capital Market Integration

In this paper we claim that enhanced economic integration can call for an increase in redistribution among workers. When individuals are risk averse and no human capital insurance is available, the share of workers who choose to invest in specific human capital will be inefficiently low. Redistribution among workers plays the role of the missing insurance market by making the investment in the specific skills more attractive. Capital market integration has two different effects. On the one hand it makes labour income taxation more distortionary, therefore reducing the optimal tax rate on labour. On the other hand, it increases the variance of specific labour wage and widens the scope for risk protection of specific human capital through the redistribution implemented by a labour income tax. We show that the insurance effect of redistribution can be stronger than the distortionary effect, so that the optimal tax rate on labour income can increase when capital markets become more integrated.     

The impact of tax rate changes on intercorporate investment

We examine how tax rates impact investment by corporations in the stock market. We regress changes in intercorporate investment on changes in the various individual and corporate top statutory marginal tax rates (MTRs). We find a significant negative association between changes in individual capital gains MTRs and changes in intercorporate investment, while no such association is evident for changes in either individual ordinary or dividend MTRs. These results support the notion that corporations respond to the after-tax rate of return and/or market efficiency consequences brought about by a change in individual capital gains MTRs. We find a significant positive relation between changes in intercorporate investment and changes in corporate MTRs on ordinary income. These results are consistent with corporations scaling back expansion plans and instead investing free cash flows in equity securities as MTRs increase.     

Pollution, Factor Taxation and Unemployment

When consumers choose between clean and dirty goods and the labour market clears, a green tax reform may not bring about a double dividend in the sense of increasing environmental quality and increasing employment. However, when firms choose between clean and dirty factors of production, and when there is unemployment, such a result is very likely to occur. The paper investigates a model of a monopolistic firm where labour and energy are factors of production and trade unions negotiate the wage rate, accepting some unemployment as a result of aggressive wage demands. It is shown that, in such a framework, a green tax reform will boost employment provided it does not increase the net-of-tax wage rate by too much. This is the case when the elasticity of substitution between labour and energy is greater than one, equal to one or not too far below one.     

Implied tax rates and the valuation of discount bonds

Discount bonds afford the investor the opportunity for capital gains. If for tax reasons the market is segmented on the demand side, investors in lower and lower tax brackets must be attracted when interest rates rise and the supply of discount bonds increases. Changes in the differential tax on capital gains and interest income also should affect relative demand. Testing these hypotheses with U.S. Treasury bond data, the implied tax rate is found to vary over time in a manner consistent with market segmentation and tax law changes.     

Joint Taxation and the Labour Supply of Married Women: Evidence from the Canadian Tax Reform of 1988*

The Canadian federal tax reform of 1988 replaced a spousal tax exemption with a non‐refundable tax credit. This reduced the‘jointness’of the tax system: after the reform, secondary earners’effective‘first dollar’marginal tax rates no longer depended on the marginal tax rates of their spouses. In practice, the effective‘first dollar’marginal tax rates faced by women with high‐income husbands were particularly reduced. Using difference‐indifference estimators, we find a significant increase in labour force participation among women married to higher‐income husbands.     

Taxes on Tax‐Exempt Bonds

Implicit tax rates priced in the cross section of municipal bonds are approximately two to three times as high as statutory income tax rates, with implicit tax rates close to 100% using retail trades and above 70% for interdealer trades. These implied tax rates can be identified because a portion of secondary market municipal bond trades involves income taxes. After valuing the tax payments, market discount bonds, which carry income tax liabilities, trade at yields around 25 basis points higher than comparable municipal bonds not subject to any taxes. The high sensitivities of municipal bond prices to tax rates can be traced to individual retail traders dominating dealers and other institutions.     

Intertemporal Tax Discontinuities

We define an intertemporal tax discontinuity (ITD) as a circumstance in which different tax rates are applied to gains realized at one point in time versus some other point in time. We study the effects of ITDs on market behaviors at the time of disclosures of firm performance, assuming that all investors who trade firm equities are subject to tax. The results of our paper suggest that relative to an economy in which ITDs are absent, ITDs may dampen trading volume and amplify price changes at the time of disclosure.     

Tax Coordination and Unemployment

This paper analyses the implications of unemployment for fiscal competition and tax coordination among small open economies. Unemployment is modeled as resulting from wage bargaining. The analysis focuses on the effect of labour and capital tax coordination on welfare. We show that, while coordinated capital and labour tax increases unambiguously raise welfare if labour markets are competitive, different results emerge if labour markets are unionised. It turns out that coordinated capital and labour tax increases may reduce welfare. This revised version was published online in July 2006 with corrections to the Cover Date.     

Government financing decisions and asset returns

This paper presents an empirical investigation of the relation between government financing decisions and asset returns. In particular, the focus is on whether a substitution of debt financing for tax financing of a given level of expenditures is associated with an increase in interest rates. The paper brings a different perspective to empirical investigations of government fiscal policies by examining the response of asset prices in an efficient capital market to such policies rather than focusing on aggregate consumption behavior. The results are consistent with the idea that asset prices are unrelated to how the government finances its expenditures. The results, however, also indicate that the capital market is not indifferent with respect to the level of government expenditures as higher interest rates are associated with increases in government purchases.     

Pawns and queens revisited: public provision of private goods when individuals make mistakes

This paper analyses the optimal tax policy and public provision of private goods when the government is paternalistic and has a redistributive objective. When individuals only differ with respect to their income-earning abilities, the publicly-provided goods should be overprovided, relative to the decentralised optimum, if society’s marginal valuation of them exceeds the individual valuation and if these goods are complements to labour supply. However, when the individuals also differ in terms of their valuation of the publicly-provided good, this simple conclusion does not hold. Optimal marginal income tax rates are shown to differ from the standard rules if publicly-provided goods and labour supply are related.      

The Effect of Financial Incentives on Labour Supply: Evidence for Lone Parents from Microsimulation and Quasi‐Experimental Evaluation*

The aim of this paper is to analyse the work incentive effects of a change in the Australian tax and transfer system on lone parents in July 2000. To evaluate the effect of the total change only, microsimulation can be used; but for a subgroup of lone parents, a few components of this policy change can be analysed through two alternative approaches — microsimulation and quasi‐experimental evaluation. Both approaches examine the effects on the probability of employment and on average working hours. The results from microsimulation show that the combined changes introduced in July 2000 — involving reduced withdrawl rates, changed family payments and lower income tax rates — have increased labour supply for lone parents to a moderate extent. The estimated effect on average working hours when using microsimulation is very close to the effect estimated in a quasi‐experimental approach using matching techniques to control for alternative influences.     

Factors Influencing Interest Rates on Delinquent Property Tax Certificates

This study examines the market for delinquent property tax certificates, a commonly used enforcement mechanism in property tax systems around the United States. We model the value of such certificates using a continuous-time framework and propose a statistical model that allows testing for factors that affect interest rates charged by investors who purchase the certificates as investment instruments. Using sample data from tax certificate sales in Florida from 1982 to 2000, we find that interest rates on certificates are negatively and significantly related to assessed property value and homestead status, and positively related to local ownership. We find an inverse relationship between interest rates and the number of certificates purchased by the certificate investor, indicating a significant clientele effect in this market. We also find that the implied effective tax rate is positively related to the interest rates charged by investors. Overall, the findings provide insight into the function of this unique market niche.     

Why Are Mothers Working Longer Hours in Austria than in Germany? A Comparative Microsimulation Analysis*

Labour force participation rates of mothers in Austria and Germany are similar; however, full‐time employment rates are much higher among Austrian mothers. In order to find out to what extent these differences can be attributed to differences in the tax‐transfer system, we perform a comparative microsimulation exercise. After estimating structural labour supply models for both countries, we interchange two important institutional characteristics of the two countries ‐ namely, (i) the definition of the tax unit within the personal income tax and (ii) the parental leave benefit scheme. As our analysis shows, differences in mothers’employment patterns can partly be explained by the different tax systems: while Germany has a system of joint taxation with income splitting for married couples, Austria taxes everyone individually, which leads to lower marginal tax rates for secondary earners than in the German system.     

Corporate Social Responsibility,Tax Aggressiveness,and Firm Market Value

This paper examines the relationship of corporate social responsibility (CSR), tax aggressiveness, and firm market value. An economic model has been developed to show that profit‐maximization firms are willing to incur additional costs in CSR, such as paying more taxes, as long as they can differentiate their products from non‐CSR firms, and that socially conscious consumers will buy products from CSR firms at prices higher than those of non‐CSR firms. The empirical study in this paper indicates that the higher the CSR ranking of a firm, the less likely a firm is to engage in tax aggressiveness. It also indicates that a reputation of higher CSR will enhance firm market value. Using Canadian companies listed in the S&P/TSX 60 index, I find that both firms’ five‐year effective tax rates and annual effective tax rates are positively associated with their overall CSR scores as well as with their social scores. Firms’ five‐year effective tax rates are also positively associated with their governance index. I also find that firms’ overall CSR ranking and governance scores are positively associated with their market value.