Where it may matter, is that the authorised banking operations that GE have in Australia is confined to being a credit card acquirer and credit card issuer. They have to be a bit careful about how they will allow credit balances to occur due to their license.
I have no idea if that's true or not, but if it is, they would need to prevent people from paying cards into credit full stop.
In any case, the current debate is whether it's "abuse" of the card to pay tax bills that are greater than your credit limit. As I said, you can easily do that without ever putting your card in credit, so the act of putting your card in credit has no bearing on this question either way.
The only reason for putting your card in credit is to stay within the ATO rules on fee deductibility, it has nothing to do with attempting to pay more than you can afford or more than the credit card provider wants you to pay, or anything else. Even if I had a million dollar credit limit, I would still have loaded my card in credit before paying my recent ATO bill!
The bottom line is, if loading your card in credit creates a problem for any credit card provider, they could easily stop customers putting cards into credit, and/or stop awarding points if the account is in credit. If a card provider instead chooses to allow me to load my card up into credit and still award points, then I can only assume they are happy for me to do this.
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