Many countries grant tax exemptions to religious organizations. The legitimacy of these exemptions hinges on nationally and internationally protected freedoms of thought, conscience, and worship. Thus, it is important that religious organizations comply with international tax rules and exemptions. This study aims to compare religious tax exemptions in the United States (US) and the European Union (EU) with those of Turkey, reveal basic differences in religious-based tax exemptions and evaluate tax exemptions for religious organizations in general. Religious tax exemptions are compared by evaluating relevant laws, tax policies, court and commission decisions. As seen in this study, no consensus has been reached yet regarding tax policy for religious organizations. This study's findings revealed significant disparities in religious-based tax policies between the United States, the European Union and Turkey. To avoid problems, national and international laws should be enacted to eliminate this conflict. Tax regulations must comply with laws that protect freedom of thought, conscience and religion. Otherwise these persistent differences in tax policy are likely to have substantial historical, cultural, and political effects.