Augmented theory of planned behaviour, tax literacy and tax compliance in developing countries: a conceptual framework

Effective tax systems rely on tax literacy and tax compliance behaviour among taxpayers for government revenue mobilisation. However, the extant literature suggests that in sub-Saharan Africa, mobilising tax revenue to fund public services and infrastructure development to achieve the United Nations’ Millennium Development Goals (SDGs) remains a great challenge. According to the 2024 Revenue Statistics in Africa report, jointly undertaken by the African Union Commission (AUC), African Tax Administration Forum (ATAF), the OECD Centre for Tax Policy and Administration and the OECD Development Centre, the average tax-to-GDP ratio was 16% in African countries in 2022, compared to 19.3%, 21.5% and 34.0% respectively for Asia and the Pacific, Latin America and the Caribbean, and OECD countries. Despite being recognised as a critical aspect of tax compliance, the role played by political legitimacy in taxpayer compliance behaviour remained under-explored in developing countries. This study proposes an Augmented Theory of Planned Compliance Behaviour (ATPCB) framework, based on Ajzen’s (1991) theory of planned behaviour (TPB) and both the deterrence and accommodation theories of compliance, to predict taxpayers’ compliance behaviour, especially in developing countries. The framework comprises four components: attitude, subjective norms, perceived behavioural control, and political legitimacy. The findings of this study have implications for policymakers and researchers as it will assist future research in providing a structured approach for assessing taxpayers’ compliance behaviour. Also, it will provide interested parties with a better understanding of the combined effects of individuals’ beliefs, attitudes, norms, and political legitimacy on tax compliance. Lastly, the study will assist governments in deciding the future course of action towards effective policymaking for taxation and revenue mobilisation.