The aim of support under the second pillar of the CAP is to improve the economic situation of farms. The research objective of the study is to estimate the effect of support for investments under RDP 2014-2020 on an increase in labour productivity on Polish farms, defined as gross value added per annual work unit (GVA/AWU). The applied research tool is propensity score matching, enabling to calculate the average treatment effect for the treated (ATT). The study uses data from Polish FADN (Farm Accountancy Data Network) regarding individual farms.