(1) A lessor may apply in writing to the Commissioner for a reassessment of duty paid on a lease instrument if the lease is subsequently varied so as to reduce the total cost of the lease.
(2) The application shall be made within 5 years after the initial assessment or 12 months after the variation, whichever is the later, and shall be supported by such documents and information as the Commissioner specifies.
(3) The Commissioner, if satisfied that the lease has been varied so as to reduce the total cost of the lease, shall refund the difference between the duty actually paid and the duty that would have been payable if the lease had been granted on the terms as so varied.