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Church Tax (Kirchensteuer)
About 70% of church revenues come from church tax (Kirchensteuer) in Germany. This was approximately 12 billion euro in 2020.
In Germany, based on tax regulations passed by the communities and within the limits set by state laws, communities may either
require the taxation authorities of the state to collect the fees from the members based on income tax assessment (then, the authorities withhold a collection fee), or
choose to collect the church tax themselves.
https://www.german-tax-consultants.com/german-taxes/church-tax-kirchensteuer.html