Permanent exemption from payroll taxes: The role of hiring frictions

Belgium’s 2016 payroll tax exemption for first-time employers triggered a sharp increase in firms hiring their first worker but little growth among larger firms. To account for this pattern, we develop and estimate a directed search model—with discrete hiring, firm heterogeneity, and endogenous entry—using Belgian microdata. The exemption reduces the high marginal cost of the first hire, enabling many previously non-hiring entrepreneurs to become employers, but most lack the productivity needed to expand beyond one worker. The model matches the post-reform size distribution and identifies the conditions under which size-dependent hiring subsidies can foster sustained firm growth.