Division of excess proceeds; settlement of certificates of claims and refunds to mortgagors

If, after deducting (in such manner and amount as the Secretary shall determine to be equitable and in accordance with sound accounting practice) the expenses incurred by the Secretary, the net amount realized from any property conveyed to the Secretary under this section and the claims assigned therewith exceed the face value of the debentures issued and the cash paid in exchange for such property plus all interest paid on such debentures, such excess shall be divided as follows:

(i) If such excess is greater than the total amount payable under the certificate of claim issued in connection with such property, the Secretary shall pay to the holder of such certificate the full amount so payable, and any excess remaining thereafter shall be paid to the mortgagor of such property if the mortgage was insured under section 1709 of this title : Provided , That on and after September 2, 1964 , any excess remaining after payment to the holder of the full amount of the certificate of claim, together with the accrued interest increment thereon, shall be retained by the Secretary and credited to the applicable insurance fund; and

(ii) If such excess is equal to or less than the total amount payable under such certificate of claim, the Secretary shall pay to the holder of such certificate the full amount of such excess.