What is the ruling on the zakat of land on which an amount is still outstanding, and is zakat obligatory on the amount paid if ownership has not been transferred due to the seller's unreadiness?

If the intention when purchasing land was not for trading, then there is no Zakat due on it, whether or not any part of its price remains unpaid, because the Prophet, peace and blessings be upon him, said: "He commands us to pay Zakat from what we prepare for sale."

However, if the purpose of buying the land was for trading and profit, and its value reaches the nisab by itself or when combined with other assets, then Zakat is obligatory upon the buyer once a full year has passed since it came into his possession. This is from the time of the contract if there was no option (khiyar) between them, or if the option was for the buyer. If there was an option between them or if it was for the seller, then it is from the time the option expires. The non-possession of the sold item or the non-receipt of the price does not prevent the obligation of Zakat.