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Effectiveness and Economic Impact of Tax Incentives in the SADC ...

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4. <strong>Economic</strong> Toolkit for Analyz<strong>in</strong>g<br />

<strong>Tax</strong> <strong>Incentives</strong><br />

This chapter reviews three k<strong>in</strong>ds <strong>of</strong> analytical tools that are widely used to assess tax<br />

<strong>in</strong>centive programs: marg<strong>in</strong>al effective tax rates; tax expenditure budget<strong>in</strong>g; <strong>and</strong> criteria for<br />

screen<strong>in</strong>g <strong>and</strong> evaluat<strong>in</strong>g projects to qualify for tax <strong>in</strong>centives. An economist’s analytical<br />

toolkit does not provide precise measurements <strong>of</strong> <strong>the</strong> effectiveness <strong>and</strong> impact <strong>of</strong> various<br />

<strong>in</strong>centive programs or a def<strong>in</strong>itive determ<strong>in</strong>ation <strong>of</strong> whe<strong>the</strong>r governments should grant tax<br />

breaks to particular <strong>in</strong>vestment projects. What <strong>the</strong> tools can do is reduce uncerta<strong>in</strong>ty about<br />

costs <strong>and</strong> benefits, <strong>and</strong> <strong>in</strong>form <strong>the</strong> political judgments.<br />

4.1 Marg<strong>in</strong>al Effective <strong>Tax</strong> Rate 45<br />

The statutory tax rate only partially reveals <strong>the</strong> extent to which <strong>the</strong> tax system reduces <strong>the</strong> rate<br />

<strong>of</strong> return on capital <strong>and</strong> affects <strong>the</strong> allocation <strong>of</strong> capital across alternative uses. This is because<br />

<strong>the</strong> actual tax burden on any given activity is <strong>in</strong>fluenced by many factors beside <strong>the</strong> basic tax<br />

rate, <strong>in</strong>clud<strong>in</strong>g exemptions, deductions, exclusions, allowances, <strong>and</strong> credits, as well as <strong>the</strong><br />

nature <strong>of</strong> <strong>the</strong> <strong>in</strong>vestment itself.<br />

A st<strong>and</strong>ard technical method for evaluat<strong>in</strong>g <strong>the</strong> impact <strong>of</strong> <strong>the</strong> tax system on <strong>in</strong>vestment<br />

decisions is to estimate <strong>the</strong> marg<strong>in</strong>al effective tax rate (METR). The METR measures <strong>the</strong> extent<br />

to which <strong>the</strong> tax system reduces <strong>the</strong> real rate <strong>of</strong> return on <strong>in</strong>vestment, at <strong>the</strong> marg<strong>in</strong>. More<br />

formally, <strong>the</strong> METR is def<strong>in</strong>ed as<br />

METR = (RORbT – RORaT) / RORbT (4.1)<br />

where RORbT <strong>and</strong> RORaT are <strong>the</strong> real rates <strong>of</strong> return before <strong>and</strong> after tax. Suppose, for<br />

example, that <strong>the</strong> rate <strong>of</strong> return on an <strong>in</strong>cremental capital project is 30 percent before tax, <strong>and</strong><br />

45 Useful discussions <strong>of</strong> <strong>the</strong> METR can be found <strong>in</strong> Chua (1995), Zee et. al (2001), OECD (2001), Shah (1995), Bird<br />

<strong>and</strong> Oldman (1990, Part Three), <strong>and</strong> World Bank (1988, chapter 4).

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