93A.—(1) If any person who has paid tax for any year of assessment alleges that an assessment is excessive by reason of some error or mistake in the return or statement made by him for the purposes of the assessment, he may, at any time not later than 6 years after the end of the year of assessment within which the assessment was made, make an application in writing to the Comptroller for relief.
(2) On receiving any such application, the Comptroller shall inquire into the matter and shall, subject to this section, give by way of repayment of tax such relief in respect of the error or mistake as appears to him to be reasonable and just.
(3) No relief shall be given under this section in respect of an error or mistake as to the basis on which the liability of the applicant ought to have been computed when the return or statement was in fact made on the basis of or in accordance with the practice of the Comptroller generally prevailing at the time when the return or statement was made.
(4) In determining any application under this section, the Comptroller shall have regard to all the relevant circumstances of the case, and in particular shall consider whether the granting of relief would result in the exclusion from charge to tax of income of the applicant, and for this purpose the Comptroller may take into consideration the liability of the applicant and assessments made upon him in respect of other years.
(5) Section 79 shall apply in respect of an appeal against a determination of the Comptroller under this section except that no such appeal shall be entertained until the sum of $250 has been deposited with the clerk to the Board of Review.
(6) The sum referred to in subsection (5) shall be refunded in the event of the appeal being allowed.
(7) The Board of Review may, if in its opinion the appeal was vexatious or frivolous, order that the whole or any part of the aforesaid sum shall be forfeited and awarded to the Comptroller as costs.