The aim of this work is to analyze the business cycles of the Mercosurís member countries in order to investigate their degree of synchronization. The econometric model uses the Beveridge- Nelson-Stock-Watson multivariate trend-cycle decomposition, taking into account the presence of common features such as common trend and common cycle. Once the business cycles are estimated, their degree of synchronization is analyzed by means of linear correlation in time domain and coherence and phase in frequency domain. Despite the evidence of common features, the results suggest that the business cycles are not synchronized. This may generate an enormous dificulty to intensify the agreements into MercosurThe aim of this work is to analyze the business cycles of the Mercosurís member countries in order to investigate their degree of synchronization. The econometric model uses the Beveridge- Nelson-Stock-Watson multivariate trend-cycle decomposition, taking into account the presence of common features such as common trend and common cycle. Once the business cycles are estimated, their degree of synchronization is analyzed by means of linear correlation in time domain and coherence and phase in frequency domain. Despite the evidence of common features, the results suggest that the business cycles are not synchronized. This may generate an enormous dificulty to intensify the agreements into Mercosur