Purpose This paper aims to develop a conceptual framework of tax knowledge that can be used to analyse and discuss tax knowledge as a factor influencing tax compliance. Design/methodology/approach Relevant literature was sourced using keywords pertaining to tax knowledge to identify the constructs of the framework. Thereafter, secondary interview data on small business owners’ tax challenges were thematically analysed to test the proposed framework. Findings Three elements of tax knowledge were identified, namely, general, procedural and legal tax knowledge. General tax knowledge relates to a need to have a fiscal awareness; procedural tax knowledge refers to understanding tax compliance procedures; and legal tax knowledge pertains to a need to understand regulations. Practical implications The proposed framework may assist future research in providing a structured approach for assessing tax knowledge as a factor influencing tax compliance. The framework may also assist tax authorities in designing targeted tax education outreach programmes for taxpayers and improve their understanding of taxpayer behaviour to influence the compliance behaviour of its taxpayer population. Originality/value An acceptable and specific measurement of tax knowledge as a factor of tax-compliance behaviour has been proposed and tested as a tool for analysing and discussing taxpayers’ knowledge variables.

Background: A conceptual framework to assess the particular tax situation of small business owners identifies three key aspects that distinguish small business owners’ perceptions of their tax obligation. These aspects are: they are likely to perceive more opportunities not to comply than employed taxpayers; they are likely to lack meaningful taxation knowledge and they are likely to frame the paying of taxes as a loss.Aim: The aim of this article was to sketch a tax compliance risk profile of guest house owners in Soweto to suggest strategies to negate those factors that may negatively influence their compliance behaviour.Setting: Tax compliance is a priority for tax administrations, especially in developing countries such as South Africa where small businesses are a high compliance risk group. Small guest houses’ income is usually variable and/or cash-based and not easily verifiable against third-party data, which creates a high risk of non-compliance.Methods: A mixed methods research approach was followed. Empirical evidence in the form of semi-structured questionnaires administered face-to-face with 23 guest house owners in Soweto was statistically and thematically analysed to compile a profile of the tax compliance risk according to the framework for tax compliance behaviour of small business owners.Results: Factors such as age, gender and tax morale show favourable results for tax compliant behaviour. However, perceptions of fairness, perceived opportunity for non-compliance, knowledge deficits, decision frames, industry, business size and social norms embrace a high risk of non-compliance for this population.Conclusion: Information pointing out the factors that could negatively influence tax compliance behaviour in this population was obtained. Strategies for empowering small business owners to comply voluntarily with their tax obligations are suggested and include, for example, taxpayer education and improved communication efforts from the revenue authority.