Section 155(2) in The Delhi Municipal Corporation Act, 1957
(2)When the person liable for the payment of any tax is deemed to be in default under sub-section (1), such sum not exceeding twenty per cent. of the amount of the tax as may be determined by the Commissioner may be recovered from him by way of penalty, in addition to the amount of the tax and the notice fee, payable under sub-section (2) of section 154.