The aim of this paper is to analyse the impact of potential accession of the BRICS countries to the Government Procurement Agreement (GPA). For this purpose, in a first attempt, I use the newly created public procurement database and modelling extension of the Global Trade Analysis Project (GTAP) model. The shock design of the modelling scenarios is based on insights from empirical literature and is calculated as a difference between private and government sector import penetration of the BRICS countries compared to the one of the GPA parties. The current research aims to provide first insights about the economic impact of a potential accession of the BRICS countries to the GPA.