Small- and medium-sized accounting practices (SMPs) offer clients – small and medium-sized entities – support to comply with statutory services (financial statements, tax file preparation) and provide customised business advice. This paper investigates differences in SMP’s financial performance. A survey was sent to Belgian heads of SMPs, asking about personal characteristics regarding education and experience (representing human capital resources), firm size, service types provided, cooperation, and communication (representing organisational capital resources). The findings show that additional specialisation degrees, more experience, and more continuing professional development are linked with higher sales per employee. However, the advan...