There is no tax payment due until the end of Feb 2012.
The annual report states that this tax payment will be approx. $47m or 13.5c per share.
So, cash-backing at the time of the AGM will remain around the current levels of $235m or 67c per share.
Post-distribution of $135m or 38c per share in Dec, this will then drop to $100m per 28.5c per share.
Post-tax payment in Feb, this will then drop to $53m or 15c per share (all else being equal).