Section 11A(3) in The Punjab Motor Vehicles Taxation Act, 1924
(3)The amount of interest payable under this section shall be calculated by treating part of a month as one month but no interest shall be chargeable if the total amount payable on account of tax or penalty or both is fifty rupees or less and if such an amount is more than fifty rupees but less than one hundred rupees, interest shall be calculated treating such amount to be one hundred rupees.