Publicação
Essays on taxation in Africa and tax reforms in Angola
| Resumo: | The thesis addresses the following research questions: What was the impact of the tax-reforms on the non-oil tax revenues in Angola? How is taxation affecting democracy indices in Africa? Is there evidence of a Laffer curve for taxes in Africa? First, we estimated the impact of tax-reforms on non-oil tax revenues in Angola 2008-2021. We found that reforms had a positive impact on the non-oil fiscal revenues. The ARDL model showed, in comparison to the years before the reforms, that the 2011 reform contributed to 46% more non-oil tax revenues, the 2015 reform to 140.5%, and the 2019 reform to a 115.6%. Then we applied econometric methods for-panel-data to study the impact of taxes, measured by tax revenues/GDP ratio on democracy indices in 50 African countries in the period 1980-2021. The findings reveal that the relationship is concave, demonstrating that the impact of taxation is positive up to a certain threshold, after which democracy-indices start to decrease. The threshold was found to be around 26%-27%, greater than the observed average tax-revenue/ GDP ratio in the continent, which was of 14%. Finally, we estimated the Laffer curve for three tax revenues categories (corporate, labour, and in-direct) using a panel of 25 African countries in the period of 2011-2021 using parametric and non-parametric regressions. We found evidence of Laffer curve for the three tax categories. The Reve-nues-Maximizing-tax-rates for the corporate tax revenues were found to be between 26%-27%; for the indirect taxes, between 13%-15.2%; and for the labour taxes, between 40.8%-45%. |
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| Autores principais: | Paulo, Francisco Miguel |
| Assunto: | História de África História de Angola Democracy indices Laffer curve Fiscalidade -- Taxation Reforma fiscal -- Tax reform Índices de democracia Curva de Laffer |
| Ano: | 2025 |
| País: | Portugal |
| Tipo de documento: | tese de doutoramento |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | ISCTE |
| Idioma: | inglês |
| Origem: | Repositório ISCTE |
| Resumo: | The thesis addresses the following research questions: What was the impact of the tax-reforms on the non-oil tax revenues in Angola? How is taxation affecting democracy indices in Africa? Is there evidence of a Laffer curve for taxes in Africa? First, we estimated the impact of tax-reforms on non-oil tax revenues in Angola 2008-2021. We found that reforms had a positive impact on the non-oil fiscal revenues. The ARDL model showed, in comparison to the years before the reforms, that the 2011 reform contributed to 46% more non-oil tax revenues, the 2015 reform to 140.5%, and the 2019 reform to a 115.6%. Then we applied econometric methods for-panel-data to study the impact of taxes, measured by tax revenues/GDP ratio on democracy indices in 50 African countries in the period 1980-2021. The findings reveal that the relationship is concave, demonstrating that the impact of taxation is positive up to a certain threshold, after which democracy-indices start to decrease. The threshold was found to be around 26%-27%, greater than the observed average tax-revenue/ GDP ratio in the continent, which was of 14%. Finally, we estimated the Laffer curve for three tax revenues categories (corporate, labour, and in-direct) using a panel of 25 African countries in the period of 2011-2021 using parametric and non-parametric regressions. We found evidence of Laffer curve for the three tax categories. The Reve-nues-Maximizing-tax-rates for the corporate tax revenues were found to be between 26%-27%; for the indirect taxes, between 13%-15.2%; and for the labour taxes, between 40.8%-45%. |
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