Interest as to its Nature Capital interest is the interest payable to the creditor for being deprived of the amount of money that she/he lent to the debtor. Interest for delay is the interest payable where the debtor fails to pay debts back in time. Pursuant to Article 10 TCC, unless otherwise provided, interest for delay is to be charged starting from the due date of the debt, and if there is not a specific date for delay, then from the date of notification of the debtor (by the creditor). The correct answer is D.