Is it permissible to sell by installment with an increase up to a specified term, taking into consideration the mutual consent of both parties, based on the Almighty's saying: (O you who have believed, do not consume your property among yourselves in falsehood, but [instead] let there be a trade [carried out] by mutual consent among you), and what if banks were to deal in gold and silver in the same manner of selling by installment with an increase?

Installment sales are permissible if they are free from usury (riba), uncertainty (gharar), and ignorance (jahalah), as mutual consent alone does not legitimize transactions that are invalid according to Islamic law. A condition for installment sales is that they should not involve items subject to riba al-nasī'ah (usury of delay), such as gold, silver, and paper currencies; these cannot be sold on installments. However, other goods may be sold on installments.