Every employee whose wages are subject to the withholding provisions of this article shall, on or before January 1, 1969, furnish his or her employer with a certificate showing the exemption claimed by such employee for purposes of withholding. If any employee shall fail or refuse to furnish his or her employer such certificate, the employer shall withhold from the wages of such employee as if such employee claimed no exemption either for himself or herself. The furnishing of such information shall be in the form required by the commissioner.