Auckland Council's been forced to adjust some of its ratings among its Business Improvement Districts.
It's found that the process leading up to the rates strike discovered extra properties as liable for BID rates, meaning the calculation resulted in rates that were too high.
But it wasn't picked up until after the Long-Term Plan was adopted.
Finance Manager Kevin Ramsay says they've tried to work quickly to remedy the situation.
"The total rate amount that's going to be struck for those BIDs is exactly as it was originally anticipated, but we've identified additional properties. So in effect we're reducing the rate amount that each is going to pay, just spreading it across those properties."
However Mr Ramsay says it means the 1500 other properties found to be part of the BID area will now have to pay rates.