Throughout the European Union, national income tax systems support charitable activities by way of preferential treatment. However, a number of Member States operate relief regimes which appear to trigger the question of compatibility with Union law with respect to the fundamental freedoms. In this first study to examine charity and donor taxation regimes across a wide range of Member States, the author focuses on compatibility with EU non-discrimination law. She examines twenty national regimes, both comparatively and from the perspective of overarching EU law. The countries covered are Austria, Belgium, Bulgaria, Cyprus, Estonia, Finland, Germany, Hungary, Ireland, Italy, Latvia, Lithuania, Malta, The Netherlands, Poland, Portugal, Slovakia, Spain, Sweden, and the United Kingdom. Although charity and donor taxation falls within the competence of the Member States, they must nonetheless observe primary Union law and grant non-discriminatory treatment where a fact pattern falls within the ambit of the fundamental freedoms. In the course of defining this framework, the study addresses such issues as the following: types of relief schemes maintained for charities and donors; administrative requirements; international aspects (both inbound and outbound); privileged donations and capital gains treatment of in-kind donations; eligible donees; whether and to what extent charitable entities and donors can actually rely on the fundamental freedoms; specific applicability of each of the relevant fundamental freedoms; the issue of comparability; justifications for restrictive measures in Member State practice; and the issue of proportionality.