1. Taking the permanent tax (Zakat) which ranges between 2.5-10% of the stored possession (which is not essential for one's living), in every year.
"Of their goods take alms, that so thou mightest purify and sanctify them; and pray on their behalf. Verily thy prayer is a source of secu rity for them: and God is One heareth and kno- weth. " (Qur'an, 9:103)
Khums is another revenue of taxation. It is one fifth of the annual excess of one's profit to be taken by the Islamic Government.