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Tax compliance and evasion pose significant challenges to tax authorities in South Africa and other countries. In recent times, corporate governance issues have increasingly involved tax compliance. This study focuses on unresolved audit issues with the South African Revenue Service (SARS), expensive litigation, and lengthy arbitration with the tax Ombudsman. These issues are complicated by legal elucidations, legislative components, and regulatory frameworks. The paper aims to clarify the purpose of a tax legal audit expert at SARS in the initial phases of an audit procedure.  To answer this research question, a thorough mapping review using methodical, technique-based literature evaluation was conducted. The study found that the lack of skilled tax legal audit experts hampers the effectiveness and efficiency of tax audits. Therefore, tax authorities must invest in the skills of tax legal audit experts to improve audit outcomes.

Domestic revenue mobilisation is fundamental if African countries are to fund investments in health, education, infrastructural development, economic growth, human capital development, security, and prosperity to attain the Sustainable Development Goals by 2030. Some goals focus on eradicating poverty, reducing inequalities, strengthening institutions, and providing decent work. This requires resources and investment, yet Sub-Saharan African countries continuously struggle to mobilise enough revenue to meet basic government objectives. Through a critical literature review, this paper focuses on sustainable tax revenue mobilisation in Sub-Saharan African Countries, discussing the challenges, opportunities, and prospects for possible amelioration of tax systems. Challenges identified to explain the ineffectiveness of revenue mobilisation in these countries include the presence of a significant informal sector, weak tax administration capacities, the growth in the digital economy, corruption, governance quality, and increased tax avoidance and evasion by multinational companies. Possible prospects include taxation of the digital economy, taxing the informal sector, the capacitation of tax authorities, and the broadening of tax bases.