Section 69C of Income Tax Act "Unexplained expenditure, etc"
Section 69C. Where in any financial year an assessee has incurred any expenditure and he offers no explanation about the source of such expenditure or part thereof, or the explanation, if any, offered by him is not, in the opinion of the Assessing Officer, satisfactory, the amount covered by such expenditure or part thereof, as the case may be, may be deemed to be the income of the assessee for such financial year :
Provided that, notwithstanding anything contained in any other provision of this Act, such unexplained expenditure which is deemed to be the income of the assessee shall not be allowed as a deduction under any head of income.
Section 69D of Income Tax Act "Amount borrowed or repaid on hundi"
Section 69D. Where any amount is borrowed on a hundi from, or any amount due thereon is repaid to, any person otherwise than through an account payee cheque drawn on a bank, the amount so borrowed or repaid shall be deemed to be the income of the person borrowing or repaying the amount aforesaid for the previous year in which the amount was borrowed or repaid, as the case may be :
Provided that, if in any case any amount borrowed on a hundi has been deemed under the provisions of this section to be the income of any person, such person shall not be liable to be assessed again in respect of such amount under the provisions of this section on repayment of such amount.
Explanation.-For the purposes of this section, the amount repaid shall include the amount of interest paid on the amount borrowed.