Thanks cove, VAG newbie, appreciate the advice. Seems ANZ Black, CBA Diamond and the two HSBC cards might work for me - I'll investigate further. Good point re the bonus VAG newbie - doubt I would've thought of that on my own (at least not channeling to SQ via VA) - but unfortunately I doubt I'd have the points in time to take advantage.
Mark3000, if I thought for a second that what I'm proposing to do would contribute to "spoiling" this any more than what everyone else is doing, I wouldn't do it. Not just changing to keeping the card for a year - not at all. But I don't agree with your sentiment.
I don't doubt that a large tax bill will show up on the card provider's radar in some way - most likely in an aggregated way - but that's not unique to me, the same goes for anyone else putting large tax bills through their CCs, of which there are many. Whether the card is kept for long or not isn't going to matter two hoots - this issue is either on the CC providers radar, or it's not. Or, perhaps more accurately, it's already on all of their radars (with all due respect, to think otherwise is simply naive), and whether I (or anyone else) keep a card for a year or not isn't going to influence their decision as to whether to continue allowing points each for ATO transactions.
The fact is that the economics of paying points on ATO transactions don't even come close to stacking up for CC providers - which is why they're all shutting it down, one-by-one. Keeping / using a card for other reasons alters the economics slightly, but unless you're a complete outlier in terms of non-ATO spend, it barely moves the needle once you're paying more than small amounts of tax this way. Or, to put it another way - if a CC provider decides to shut down points earn on ATO payments, it's going to be because of the total volumes coming through (and associated costs) - not because of what else those cardholders do / don't do with their cards.