(a) If the employer fails to deduct and withhold the required tax in violation of this article and thereafter the income tax liability of the employee under Code Section 48-7-20, against which the amount, if withheld, would have been a credit, is paid by the employee, the tax required to be deducted and withheld shall not be collected from the employer. This Code section in no way shall relieve the employer from the liability for any penalties or additions to the tax otherwise applicable with respect to such failure.

(b) The income tax liability of an employee shall in no way be affected by the failure of his employer to withhold the tax required under this article.