Since 6 December 2007, the maximum interest chargeable on bills has dropped from 12% (the penalty interest rate) to the Reserve Bank Target Rate +2% (at the time of writing 8.75%), and the period of non-payment after which you can begin charging has changed too. You need to amend your bills because if you don’t put the right statement on them, you won’t be able to recover interest unless you dream up some sophisticated arguments. In the case of ongoing retainers, you probably need to send the first new bill of the new regime under cover of a letter advising a change in the rate applicable to unpaid bills. Otherwise, you might fall foul of the ongoing obligation to disclose any substantial changes to anything previously disclosed.
You do not have to express the interest chargeable as a percentage rate per annum. In my experience, the only time anyone ever charges interest is when suing for fees, after the relationship has broken down, or demanding payment of fees as a condition of staying on the record or giving up a file subject to a lien. Perhaps that was because the rate was so punitively high, and perhaps because too few people knew about the penalty interest rate calculator on the internet. Why not set a lower rate which is dead easy to calculate and actually make a habit of collecting interest? So long as the rate you are effectively charging works out lower than what you would charge if you charged the maximum annual percentage rate over the same period, you’ll be sweet. Read on to find out the answer to the questions someone in your firm is sure to ponder at some stage in the future: does it apply to bills given before 8 November 2007? Does it apply in retainers in which instructions were first taken before that date?
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