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Studies on trade between EU countries are based on data from the Intrastat system. Information on transactions is recorded on the basis of declarations of entities engaged in dispatch or acquisition of goods from the EU. The data is called mirror data because it is collected, on the one hand, as values of goods supplied and, on the other hand, as values of acquisition of goods. So mirror data should converge, but this is not the case. The subject of the survey are Polish intra-Community supplies by product groups. The aim of the article was to create rankings of CN commodity chapters of Polish intra-Community supplies in 2005, 2011 and 2017 and to compare them. Using the proposed measures of data discrepancies, the quality of statistical information on Poland’s intra-Community trade in goods by CN chapters was assessed.

Asymmetries in mirror data on Polish intra-Community supplies – changes over time