In order to promote international trade in services, most bilateral and multilateral trade agreements aim at eliminating the discriminatory barriers. However, domestic regulations, which apply to all firms alike and do not intend to exclude foreign sellers, are often seen as serious obstacles to cross-border trade in services. In a recent paper, forthcoming in the Journal of Comparative Economics, Matthieu Crozet (RITM), Daniel Mirza (Univ. Tours) and Emmanuel Milet (Univ. Geneva) proposes an assessment of the impact of these regulations on international trade of professional services. The empirical analysis combines OECD measures of domestic regulation and detailed French data on firm-level bilateral export of professional services. Results show a robust and a sizeable negative impact of domestic regulations on both the decision to export and the values exported by each firm. The estimated ad-valorem tariff equivalent of domestic regulations is about 60% in 2007.