Stable public revenues provide funding for the implementation of public tasks and ensure safety of broadly understood public finances. The concept of sustainability of public revenues, however, has not been clearly defined. The article explains in more detail the concept of sustainability of public revenues and suggests methods for measuring the stability of so-called coefficient of variation. The analysis was conducted on the example of the European Union’s own resources available in the years 2000-2010. Empirical studies were carried out for various types of revenues and examined from various angles, which allowed to obtain differenciated results. The proposed coefficient of variation can transparently describe and compare the stability of various public revenues, regardless of the economic cycle. It can also be used to compare the stability of revenues at various levels of public authority.