40.—(1) The Commissioner, on being satisfied that the full estate duty has been or will be paid in respect of an estate or any part thereof, shall, if required by the person accounting for the estate duty, give a certificate to that effect, which shall discharge from any further claim for estate duty the property shown by the certificate to form the estate or part thereof, as the case may be.
(2) Where a person accountable for the estate duty in respect of any property passing on a death applies to the Commissioner, and delivers to him and verifies a full statement to the best of his knowledge and belief of all property passing on such death and the several persons entitled thereto, the Commissioner may determine the rate of the estate duty in respect of the property for which the applicant is accountable, and on payment of the duty at that rate, that property and the applicant, so far as regards that property shall be discharged from any further claim for estate duty, and the Commissioner shall give a certificate of such discharge.
(3) A certificate of the Commissioner under this section shall not discharge any person or property from estate duty in case of fraud or failure to disclose material facts, and shall not affect the rate of duty payable in respect of any property afterwards shown to have passed on the death, and the duty on such property shall be at such rate as would be payable if the value thereof were added to the value of the property in respect of which duty has been already accounted for.
(4) A certificate purporting to be a discharge of the whole estate duty payable in respect of any property included in the certificate shall exonerate from the estate duty a bona fide purchaser for valuable consideration without notice, notwithstanding any such fraud or failure.