Last year I paid my council rates in full about five days after the due date (it was a long weekend and I was away for an extra day). Yesterday (9 months later) I received a 4th Quarter bill for $8.65. Since I paid the original amount in full I assumed the bill was a mistake. I have now been informed that the amount of $8.65 is the interest owing on the late payment. The question is this: Is it lawful for the Council to charge interest on overdue rates for such a short period, or to impose a penalty payment equivalent to the interest? Apart from being quite dopey to send a bill for $8.65, as it probably cost more to generate the bill than it raised.