8. Sir,
Sub-rule 3, 3A and 4 of rule 8 of Central Excise rules,2002 stipulates that-
If the assessee fails to pay the amount of duty by the due date, he shall be liable to pay the outstanding amount along with an interest at the rate of specified by the Central Government vide notification under section 11AA of the Act on the outstanding amount, for the period starting with the first day after due date till the date of actual payment of the outstanding amount.
(3A) If the assessee fails to pay the duty declared as payable by him in the return within a period of one month from the due date, then the assessee is liable to pay the penalty at the rate of one per cent. on such amount of the duty not paid, for each month or part thereof calculated from the due date, for the period during which such failure continues .
Explanation.- For the purposes of this sub-rule, 'month' means the period between two consecutive due dates for payment of duty specified under sub-rule (1) or the first proviso to sub-rule (1) , as the case may be .
(4) The provisions of section 11 of the Act shall be applicable for recovery of the duty as assessed under rule 6 and mentioned in the return filed under these rules, the interest under sub-rule (3) and the penalty under sub-rule 3(A) in the same manner as they are applicable for recovery of any duty or other sums payable to the Central Government.
Explanation.- For the purposes of this rule, the expressions duty or duty of excise shall also include the amount payable in terms of the CENVAT Credit Rules, 2004.
The above provisions are self-explanatory and I hope these provisions will solve your doubt.