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(3) Notwithstanding subsection (1) or (2), no assessment, re-assessment or additional assessment of an amount payable by an employer under this Act may be made by the Minister under this section after four years have elapsed from the earliest of the days on or before which any contribution in relation to which that amount is payable should have been paid, unless the employer has made any misrepresentation or committed any fraud in filing any return or in supplying any information pursuant to this Part in relation thereto.