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There are two major domains of Zakat namely ‘Wealth and Production’. For production, zakat applies on gross amount as soon as production happens, while for wealth, zakat applies once a year on a fixed date on all the wealth (excluding exemptions: (i) items of personal use and (ii) means of production). This is as per established Sunnah of Prophet (SWS) for wealth and Production.
When production occurs, the zakat becomes due immediately on the gross amount (irrespective of the fact when one actually pays it). Salary being a form of Production is an ‘ijtihadi ilhaq‘ done by Ghamidi Sahab. However, one can calculate it on yearly gross earning and can pay it in installments as well.
After payment of that Zakat, whatever left is one’s wealth. And if that wealth still stays with the person till the year-end i.e. the date fixed once a year for calculation of Zakat on wealth, then the whole wealth is subject to Zakat (that production earning as well which has become wealth of a person now). Both these heads are subject to Zakat only if they reach the set Nisab for Zakat Obligation.
Please see for further details and post follow-up questions in case of any confusion:
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