I am a significant contributor to the ATO as well. Apart from the bereavement I feel every time I make a payment, I find the process time consuming and tedious - it is only my Krisflyer card which makes it all bearable.Just finished paying a 6 figure ATO account. Mrscove got the smallest chunk as I am trying to catch up to her Qantas stash. I did get 62500 Kris Miles too.