Impact of Corporate Income Tax on Economic Growth in Zambia: An Instrumental Variable Approach
DOI:
https://doi.org/10.47672/aje.2793Keywords:
Corporate Income Tax, Economic Growth, Two Stage Least Squares, Instrumental Variable, Zambia.Abstract
Purpose: The study examined the impact of corporate income tax on economic growth in Zambia using the Instrumental Variable (IV) approach.
Materials and Methods: The study utilized a quantitative research approach, employing time series data for the period 1994-2023. The data was compiled from various sources. The top statutory corporate and personal income tax rates were obtained from the World Tax Database while the other variables namely, FDI, population growth, education and trade were obtained from the World Development Indicators, compiled by the World Bank. The study employed both OLS and 2SLS using IV Methods to address endogeneity concerns.
Findings: The empirical findings show a statistically significant negative impact of CIT on economic growth in Zambia. OLS estimates suggest that higher CIT rates are associated with slower GDP per capita growth, though the magnitude of this effect is relatively small. However, the IV approach yields larger negative coefficients, reinforcing the argument that CIT exerts a substantial adverse effect on economic growth when endogeneity is accounted for. Specifically, the IV results indicate that a 10 percent reduction in the corporate tax rate causes an increase in GDP per capita growth by approximately 1.19 to 1.34 percent.
Unique Contribution to Theory, Practice and Policy: The negative impact of CIT on economic growth calls for policymakers to come up with an optimal taxation structure in which taxation of income is not excessive. This is attributed to the effects of a high CIT rate which discourages reinvestment by reducing after-tax profits, limiting the capacity of firms to expand, innovate and/or create jobs. In turn, this dampens productivity and slows overall economic growth. The study recommends that policymakers should consider lowering the CIT rate to encourage business expansion, attract investment and boost job creation.
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Abbas, Syed M. A., and Alexander Klemm. 2013. “A Partial Race to the Bottom: Corporate Tax Developments in Emerging and Developing Economies.” International Tax and Public Finance 20: 596–617.
Abramovsky, Laura, Alexander Klemm, and David Phillips. 2014. “Corporate Tax in Developing Countries: Current Trends and Design Issues.” Fiscal Studies 35: 559–588.
Alm, James, and William T. Rogers. 2011. “Taxation and Economic Growth: Evidence from U.S. States.” Public Finance Review 39(4): 555–583.
Arnold, Jens Matthias. 2008. “Do Tax Structures Affect Aggregate Economic Growth? Empirical Evidence from a Panel of OECD Countries.” OECD Economics Department Working Papers No. 643.
Arnold, Jens Matthias, Bert Brys, Christopher Heady, Åsa Johansson, Cyrille Schwellnus, and Laura Vartia. 2011. “Tax Policy for Economic Recovery and Growth.” The Economic Journal 121: F59–F80. https://doi.org/10.1111/j.1468-0297.2010.02415.x
Bird, Richard M., and Eric M. Zolt. 2005. “Redistribution via Taxation: The Limited Role of the Personal Income Tax in Developing Countries.” UCLA Law Review 52: 1627– 1695.
Brückner, Markus. 2012. “An Instrumental Variables Approach to Estimating Tax Revenue Elasticities: Evidence from Sub-Saharan Africa.” Journal of Development Economics 98: 220–227. https://doi.org/10.1016/j.jdeveco.2011.07.006
Desai, M.A., Foley, C.F. and Hines, J.R., 2004. Economic effects of regional tax havens.
Djankov, Simeon, Tim Ganser, Caralee McLiesh, Rita Ramalho and Andrei Shleifer. 2010. “The Effect of Corporate Taxes on Investment and Entrepreneurship.” American Economic Journal: Macroeconomics 2(3): 31–64.
Frankel, Jeffrey A., and David Romer. 1999. “Does Trade Cause Growth?” American Economic Review 89(3): 379–399. https://doi.org/10.1257/aer.89.3.379.
Furno, Marilena. 2021. The Macroeconomic Effects of Corporate Tax Reforms.
Gale, William G., and Samuel I. Thorpe. 2024. “The Incidence and Distributional Effects of the Corporate Income Tax: The Role of Rent Sharing.” National Tax Journal 77.
Gamage, David, and Darien Shanske. 2020. “The Importance of Taxation for Economic Development: An Overview.” Tax Law Review 74: 567–589.
Gechert, Sebastian, and Philipp Heimberger. 2022. “Do Corporate Tax Cuts Boost Economic Growth?” European Economic Review 147: 104157.
Harberger, Arnold C. 1962. “The Incidence of the Corporation Income Tax.” Journal of Political Economy 70(3): 215–240.
Hanappi, Tobias, and Martina Turban. 2023. “How Does Corporate Taxation Affect Business Investment? Evidence from Aggregate and Firm-Level Data.” OECD Economics Department Working Papers No. 1765. https://dx.doi.org/10.1787/04e682d7-en.
Huang, Chye-Ching, and Nathaniel Frentz. 2014. “What Really Is the Evidence on Taxes and Growth? A Reply to the Tax Foundation.” Center on Budget and Policy Priorities.
International Monetary Fund. 2014. Spillovers in International Corporate Taxation. IMF Policy Paper, May 9, 2014. Washington, DC: International Monetary Fund.
Jesuit Centre for Theological Reflection. 2014. The Taxation System in Zambia. Lusaka: JCTR.
Jorgenson, D.W., 1963. Capital theory and investment behavior. The American economic review, 53(2), pp.247-259.
Judd, Kenneth L. 1985. “Redistributive Taxation in a Simple Perfect Foresight Model.” Journal of Public Economics 28(1): 59–83.
Kalaš, Branislav, Vladimir Mirović, and Nikola Milenković. 2018. “The Relationship between Taxes and Economic Growth: Evidence from Serbia and Croatia.” European Journal of Applied Economics 15: 17–28. https://doi.org/10.5937/EJAE15-18056.
Langmead, Peter, and Graham Baker, eds. 2006. Tax Policy Issues in Zambia: Selected Papers. Lusaka: Langmead & Baker Limited – Fringilla.
Lee, Young, and Roger H. Gordon. 2005. “Tax Structure and Economic Growth.” Journal of Public Economics 89(5): 1027–1043.
Manley, David. 2013. A Guide to Mining Taxation in Zambia. Lusaka: Zambia Institute for Policy Analysis and Research.
McBride, William. 2012. “What Is the Evidence on Taxes and Growth?” Tax Foundation Special Report No. 207. https://taxfoundation.org.
Mertens, Karel, and Morten O. Ravn. 2013. “The Dynamic Effects of Tax Changes in the United States.” American Economic Review 103(4): 121–131.
Ministry of Finance and National Planning. 2024. 2023 Annual Economic Report. Lusaka.
Ohrn, Eric. 2018. “The Effect of Corporate Taxation on Investment and Financial Policy: Evidence from the DPAD.” American Economic Journal: Economic Policy 10(2): 272– 301.
Onyeukwu, Obinna O., Chinedu C. Okoro, and Humphrey U. P. S. Nosiri. 2020. “Effect of Corporate Taxes on Economic Growth of African Countries.” Association of Management and Social Sciences Researchers of Nigeria (AMSSRN) 4.
Piketty, Thomas, and Emmanuel Saez. 2007. “How Progressive Is the U.S. Federal Tax System? A Historical and International Perspective.” Journal of Economic Perspectives 21(1): 3–24.
Pycroft, Jonathan. 2004. Company Profit Tax Rates in Zambia. Lusaka: Langmead and Baker Ltd.
Prillaman, Sarah, and Jason Meier. 2014. “The Impact of Corporate Tax Cuts on State Economic Growth.” Journal of Public Economics 117: 1–15.
Romer, Christina D., and David H. Romer. 2010. “The Macroeconomic Effects of Tax Changes: Estimates Based on a New Measure of Fiscal Shocks.” American Economic Review 100(3): 763–801.
Romer, P.M., 1990. Endogenous technological change. Journal of political Economy, 98(5, Part 2), pp.S71-S102.
Siwale Twivwe & Benjamin Chibuye. 2019. “Mining Taxation Policy in Zambia: The Tyranny of Indecision.” International Growth Centre Blog. May 31, 2019.
Stock, James H., and Motohiro Yogo. 2002. “Testing for Weak Instruments in Linear IV Regression.” NBER Technical Working Paper No. 284. https://doi.org/10.3386/t0284.
Suárez Serrato, Carlos J., and Owen M. Zidar. 2023. “How Do Corporate Taxes Affect Economic Activity?” NBER Reporter 3: 8–13. https://hdl.handle.net/10419/300086.
Summers, Lawrence H. 1981. “Taxation and Corporate Investment: A Q-Theory Approach.” Brookings Papers on Economic Activity 1981(1): 67–127.
Tax Foundation. 2023. Corporate Tax Rates around the World, 2023. Retrieved June 15, 2025. https://taxfoundation.org/publications/corporate-tax-rates-around-the-world/.
Ten Kate, Frits, and Panagiotis Milionis. 2019. “Is Capital Taxation Always Harmful for Economic Growth?” International Tax and Public Finance 26: 758–805.
Widmalm, Frida. 2001. “Tax Structure and Growth: Are Some Taxes Better Than Others?” Public Choice 107(3–4): 199–219.
World Bank. 2025. Corporate Tax Incentives for Green Growth: Where, When, and How They Are Being Used.
Zambia Institute for Policy Analysis and Research. 2025. Analysis of the 2025 National Budget: Bold Plans, Harsh Realities. Lusaka: ZIPAR.
Zambia Revenue Authority. 2022. 2022 Tax Statistics. Lusaka: ZRA.
Zambia Statistics Agency. 2024. 2023 Labour Force Survey. Lusaka: Zambia Statistics Agency.
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