Small-to-medium firms on a fast-growth trajectory experience a variety of pressures from both internal and external sources. The effect business coaching has on entrepreneursÃ¢Â€Â™ self-confidence and ultimately firm growth, has rarely been studied. This study reports on the findings from 200 entrepreneurs, representing two cohorts from fast-growth firms, across different industries. Results suggest that business coaching is a non-direct influencer of entrepreneurial self-efficacy on firm growth. With the establishment and testing of a business coaching model, important implications are demonstrated for firms querying return-on-investment for business coaching. This investigation provides solid evidence-based outcomes, adding substantially to empirical literature on business coaching.