What is the sufficient percentage for paying Zakat monthly from one's salary (7.5% after deducting taxes and before paying any obligations)? Is Zakat obligatory on the money remaining thereafter if it reaches the Nisab and a Hawl (lunar year) passes over it, and how is its Zakat calculated if it increases monthly? Does the ruling differ if the money is in the form of gold? Is it permissible to invest in Islamic banks (such as Faisal Islamic Bank in Egypt) in a country whose banking system is based on Riba (usury)?
It is not obligatory to set aside a specific amount from the monthly salary. Rather, the money saved monthly is subject to zakat through one of two methods mentioned in a previous fatwa. The amount due is 2.5% after reaching the nisab and the passing of a hawl (one lunar year). As for investing in Islamic banks, there is no harm in it if their transactions adhere to Sharia guidelines.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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