Why was the Persian homeland of Fars exempt from imperial taxes?

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The Persian homeland of Fars was exempt from imperial taxes because the Persian people and their land were not considered a conquered territory.1

In the Achaemenid Empire, the tax structure was based on the principle that all conquered lands were the property of the king, effectively making taxes a form of rent. Because the Persians were the ruling group and their homeland was not acquired through conquest, they were not subject to these levies. While other provinces were required to pay fixed amounts in gold, silver, or tribute in kind, the status of Fars as the ancestral heartland of the dynasty granted it this unique tax-free exemption.1