How is the Zakat calculation handled for growth or increase (*nima'*) relative to the principal property's hawl?
Chapter on Zakat on Trade Merchandise
Al-Mughni
Book of Zakat
Primary text
The hawl for the increase is built upon the hawl of the principal property because the increase is subordinate to the principal in terms of ownership, following it in the determination of the hawl, similar to suckling animals (*sukhal*) or progeny. This is the view of Malik, Ishaq, and Abu Yusuf. The evidence supporting this is that the increase is a continuous growth during the hawl, subordinate to the principal in ownership, and therefore must be joined to it for the hawl, as with progeny or if the increase had not reached maturity/liquidity (*nad*). Additionally, since the price of a commodity whose part is subject to Zakat must be aggregated before sale, it must also be aggregated after sale, similar to part of the *nisab*.
Supporting text
Abu Hanifa maintains that the hawl for every newly acquired item, whether increase or otherwise, is based on the hawl specific to that type of property. Al-Shafi'i states that if the benefit (*fa'idah*) reaches maturity (*nad*) before the hawl is complete, its hawl is not built upon the hawl of the *nisab*; rather, a new hawl must commence for it, based on the saying of the Prophet (peace be upon him): "There is no Zakat on wealth until a hawl passes over it." Furthermore, a complete benefit not generated from what one already possessed should not follow the existing hawl, similar to an acquisition not resulting from profit.