Back in July I computed Snork Maiden's taxes for the 2014-15 financial year. I estimated she owed $169 in extra tax. When I actually submitted her tax return more recently I had refined that to $147. But in fact the letter from the ATO today says she owes $292. Why? There is a $145 "Excess private health fund reduction or refund (rebate reduced) item" on the notice of assessment. I guess our family income turned out to be too high and we won't get as large a tax rebate on private health insurance?