This is such a laugh, I've enjoyed giving my spending power a workout on my plat charge. I'm also getting double interest for a month or so on my tax bill by paying it early (paid my taxes on day 1 of my statement period, so 44 days interest free with the money sat in my HYSA, as well as the ATO paying me interest for an early payment of my taxes).
So for 44 days, I'm getting 4.43% interest from the ATO, on top of Macquarie's 5.25% in my savings account, PLUS a significant chunk of amex points that I'll use on my travels. Those ads of "going on holiday by paying your taxes" are finally accurate!
Now that the deadline's been extended, I'll put the remainder of my student loans through in June next year too. Makes sense why they are closing this but for now I am laughing all the way to the bank.