Is the value-added tax on the price of a car, when sold in installments, usury or company profits, and is it forbidden for the car to remain the property of the seller until its price is paid, then for its ownership to transfer to the buyer, and what transforms this permissible selling process into an interest-based one?

It is permissible to purchase a car by installments under two conditions: the selling price must be fixed and not increase with the extension of the payment period, and ownership of the car must be transferred to the buyer. It does not matter if the buyer is prevented from selling it until the price is paid in full. Usury occurs when the price increases based on the extension of the payment period.