O imposto de renda, em seus mais variados aspectos e particularidades, tem se mostrado um dos temas mais complexos e debatidos pela doutrina especializada e pelos tribunais ao redor do mundo. No Brasil, jurisdição em que o Sistema Tributário Nacional encontra-se ampla e rigidamente arquitetado pela Constituição Federal, o tema ganha especiais contornos, dada a necessidade de fiel compatibilidade entre a legislação infraconstitucional e os limites minuciosamente desenhados pelo constituinte. A presente pesquisa pretende entrar nessa seara para abordar o intrigante binômio aspecto material e base de cálculo do imposto de renda das pessoas jurídicas. No que tange ao aspecto material, investigaremos o grau de influência da rigidez do Sistema Constitucional Tributário sobre a composição dos elementos que caracterizam a renda constitucionalmente tributável. Nesse mister, será necessário discorrer sobre as teorias que propugnam pela ampla liberdade do legislador infraconstitucional para estabelecer o significado de renda (teoria legalista) até aquelas que apontam pouca (ou nenhuma) autorização para construção do conceito de renda no âmbito infraconstitucional, eis que isso seria matéria eminentemente constitucional. E assim se fará para que, posteriormente, viabilize-se o cotejamento entre a renda constitucionalmente tributável e o lucro contábil apurado de acordo com a legislação societária, eis que, tradicionalmente, é esse o ponto de partida para a apuração da base de cálculo do imposto de renda das pessoas jurídicas. Para tanto, será preciso analisar as funções e os usuários da contabilidade, identificando a atual perspectiva e os critérios que guiam a elaboração dos relatórios contábeis. Feito isso, tratar-se á de responder a seguinte indagação: poderia o legislador tributário brasileiro adotar o modelo de dependência total, isto é, adotar o lucro contábilsocietário como base de cálculo do imposto de renda das pessoas jurídicas sem nenhuma correção ou limitação no seu processo de determinação, como acontece em alguns países? Em última análise, analisar-se-á criticamente se o lucro contábil, juridicizado que foi pelo Direito Societário e Tributário, confirmaria ou infirmaria o aspecto material do indigitado tributo a teor do Texto Magno. / The income tax, in its various aspects and particularities, can be considered as one of the most complex and discussed issues by specialized doctrine and courts around the world. In Brazil, a jurisdiction that the National Tax System is comprehensive and almost tightly provided by the Federal Constitution, the issue gains special contours, specially about the compatibility between ordinary legislation and the limits provided by the constituent. This study intends to going through in this matter in order to discuss the intriguing binomial taxable event (material aspect of taxable event) and taxable basis of corporate income tax. Regarding to the taxable event, this study will investigate the influence of the Constitutional Tax System on the composition of the elements that characterize the constitutionally taxable income. At this point, it will be necessary discuss the theories that advocate the wide freedom of ordinary legislature to establish the significance of income (legalistic theory) and those theories that advocate little (if any) authorization to construct the concept of income by ordinary legislature under the argument that this matter would be eminently constitutional. And it will be done in order to make possible the comparison between constitutionally taxable income and accounting income determined in accordance with Brazilian corporate legislation, behold, traditionally, it is the starting point for calculating the taxable basis for corporate income tax purposes. For that, we will need to analyze the functions and users of accounting, identifying the current perspective and criteria that guide the preparation of financial reports. After this, we will be able to answer the following question: could the Brazilian legislature adopt the tax total dependency model, i.e., the corporate accounting as the taxable basis for corporate income tax without any correction or limitation on your determination process, as happens in some jurisdictions? In essence, this study intends to perform critical analysis of if the accounting profit, which was provided for Corporate and Tax Law purposes, confirm (or not) the taxable event provided by Federal Constitution.

I study the role of heterogeneity and idiosyncratic risk in Macroeconomics, and their implications on problems of income taxation. In the first chapter, I study the effects of redistributive taxation in an incomplete market economy with heterogeneous agents and idiosyncratic risk. I focus on the role of distortions in labor supply decisions and the interplay of heterogeneity and uninsurable idiosyncratic shocks, conducting the first general equilibrium analysis of a Negative Income Tax (NIT). I show that a NIT is a serious candidate to replace the current income tax in the United States. I find that the optimal NIT has a marginal tax rate of 28% and a transfer of 10% of per capita GDP, roughly $4600. The welfare gains of replacing the current US income tax with a NIT are equivalent to a 6.3% increase in annual consumption in every state of the world. Low-ability agents, in the bottom quintile of the productivity distribution, benefit the most, while high-ability agents are worse off. A consequence of the reform is that the composition of the labor force changes, with high-productivity agents working more, in relative terms, than low-productivity agents. Finally, I find that the riskier the economy, the higher the welfare gains of the NIT as a provider of public insurance. In the second chapter, I study labor income dynamics over the life cycle and introduce a novel methodology that can detect the presence of patterns in the idiosyncratic earnings shocks and recognize economic forces in action. Using a sample from the Panel Study of Income Dynamics (PSID), I estimate a Bayesian Logistic Smoothed Transition Autoregressive model of order 1 (LSTAR(1)) with a rich level of heterogeneity in the innovations. I find that there is a life-cycle pattern in the earning shocks: before the age 29, young workers experience shocks with higher variance and a positive probability of lower persistence than older workers. A comparison with conventional models shows that an incorrect model specification introduces bias in the estimates. The proposed model can be easily approximated with a discrete Markov process. This means that this model can be used by macroeconomists to calibrate income processes.

Thesis (doctoral)--Freie Universität, Berlin, 2002.

Thesis (doctoral)--Universität, Osnabrück, 2000.

No description available.

No abstract available. / Theses (LL.M.)- University of Natal, Durban, 1999.

No abstract available. / Thesis (M.Com.)-University of KwaZulu-Natal, 2005.

The aim of this collection of essays is to provide a detailed and critical commentary on and analysis of the legislation and case law relating to the impact of the 'business purposes test' on section 103(1) of the Income Tax Act. The Income Tax Act No. 58 of 162 and case law that are the subject of these essays were promulgated on or before 28 February 1999. / Thesis (M.Acc.)-University of Natal, Durban, 1999.

Zugleich: Diss. Münster (Westfalen), 2007. / Literaturverz.

No description available.