Nisab

In Sharia (Islamic Law) niṣāb (نِصاب) is the amount one's net worth must exceed for the Muslim owner to be obligated to give zakat. Several hadith have formulas for calculating niṣāb, the most prominent of which declaring that No Zakāt is due on wealth until one year passes. Zakat is then determined based on the amount of wealth acquired; the greater the assets, the greater the tax. It is not subject to special exemptions. (Unlike Income Tax in secular states.)