12. Penalty for non-payment of tax.-
If an enrolled person or a registered employer fails, without reasonable cause, to make payment of any amount of tax within the required time or date as specified in the notice of demand the assessing authority may, after giving him a reasonable opportunity of making representation, impose upon him a penalty not exceeding fifty per cent of the amount of tax due. This penalty shall be in addition to the interest payable under sub-section (2) or (3) of section 11.