Is Zakat due on profits generated by a company financed by an interest-bearing loan, or is it not due until the loan is fully repaid?

The father must be reminded of the gravity of borrowing with usury. He must offer sincere repentance and hasten to repay the debt to minimize the usurious interest. Zakat (definition) is obligatory upon him if his wealth reaches the nisab (definition) and a year has passed over it, and the profits are subject to zakat along with the principal. As for deducting the debt from zakatable wealth, there is a difference of opinion on this, and the safer approach is not to deduct anything from it. Regarding the deduction of usurious interest, the safer approach is not to deduct it from zakatable wealth.