The objective of this study was to evaluate the contribution of the FSC forestry certification system to improve the forestry sector, in terms of compliance to environmental and social laws and improvements in working conditions resulting from the certification process. Thirty-seven auditing reports from five Brazilian forestry companies were evaluated, throughout the 2006-2013 period. Non-compliance and observations were analyzed and organized into categories, which identified the main performance issues found in certified forestry organizations. 301 instances of non-compliance and 138 observations of audit reports were verified, where 48 and 57% respectively, were linked to the two principles studied. For obtaining and/or maintaining the certificate it is necessary for all violations to be resolved. Therefore, it was concluded that forest certification contributes to the advancement of the forestry sector in Brazil, in relation to compliance with legal, social and labor issues.