Firms without paid employees account for up to 80% of all firms, but only a small minority ever hires. This paper investigates the relationship between labour costs and the decision to hire a first employee and become an employer. Leveraging a unique policy in Belgium that permanently reduced the labour cost of the first employee by 13%, we find that the number of new, first-time employers jumped by 31% immediately following the reform. The elasticity of the probability to hire the first employee with respect to the labour cost is −2.39 [95% CI: −3.45, −1.25].