12. Penalty for non-payment.- (1) An Assessing Officer, if it appears to him that an employer has not paid the cess within the date as specified in the assessment order or has paid less cess, including the cess deducted at source or paid in advance, shall issue a notice to such employer that it shall be deemed to be in arrears and such Assessing Officer may, after such inquiry as it deems fit, impose on such employer a penalty not exceeding such amount of cess: Provided that before imposing any such penalty, such employer shall be given a reasonable opportunity of being heard and if after such hearing the Assessing officer is satisfied that the default was for any good and sufficient reason, no penalty shall be imposed on such employer. | 