Following enlargement of the European Union (EU) in 2004 and in the subsequent years, 13 new members, including Poland (EU-13), were covered with the Common Agricultural Policy (CAP). The introduced reforms contributed to improvement of the agrarian structure and a drop in the labour inputs in agriculture. Consequently, countries from the group of the EU-13 were characterised by higher farm income growth dynamics than countries that have been members of the EU for a much longer time (EU-15). The paper aims at assessment of whether the period following the accession was marked by real convergences (in 2010 prices) of farm incomes per labour input unit expressed in AW U or whether the process was reversed – there occurred divergence between the EU Member States, especially between the group of the EU-13 and the EU-15. To this end, comparative analysis method was used relying on measure of diversity of distribution used in statistics. The study was mainly based on the Economic Accounts for Agriculture (EAA , Eurostat). The study covers the years between 2004 and 2016.