Zakah and jizya should not be compared: the former is a moral obligation to share a portion of one's wealth with the less fortunate ones, and should be more correctly compared to the tithe traditionally owed to the church in christian countries; jizya is "protection money", a tax applied by the state on non-moslems and fully compulsory as taxes (and protection money) are.
The jizya was a substantial revenue stream for the Ottomans, and it has been often argued that the relatively low conversion rate in the Balkans was due to the unwillingness of the central government to loose such revenues.
The jizya was a substantial revenue stream for the Ottomans, and it has been often argued that the relatively low conversion rate in the Balkans was due to the unwillingness of the central government to loose such revenues.