Hi Marilyn,
We changed our formula calculation this year (2017/2018) and went to relative change based on valuations. Which Council thought was a fair and equitable approach to splitting, we do however have base amounts for residential and minimums for our business categories.
We took this from the IPART discussion paper April 2016 – ‘Freezing existing rate paths’ on pg. 40 even though our proposed merger has been cancelled.
I’m happy to provide further information if you need, just drop me an email or give me a call.