Penalty for failure to pay tax when due

If a person registered under this Act, fails to pay the amount of tax in accordance with the provisions of this Act, he shall be liable to pay, in addition to the tax and the interest payable by him, a penalty, at the rate of two per cent per month on the tax, so due and payable from the date, it had become due to the date of its payment, or to the date of the order of the assessment, whichever is earlier. The amount of penalty payable under this section, shall be calculated by considering a part of the month as one month.