I am sure this is fine, and can't see a mention of penalty for net balance going down, but if someone was unemployed / not bothered to work and no money coming into their ING account, could they.
1.) Once or twice a week walk to Woolworths and withdraw $200 (maybe even get 50c bonus).
2.) Immediately walk to post office and deposit it.
and by month end have deposited > 1k, despite balance remaining neutral (in fact going down due to bills).
I did this when I needed a 3 month break from the workforce. Transferred to another bank and back again. Savings was going down slightly, but I still got my interest.
i believe u need to have 5 card transactions on your ING Everyday account to unlock that bonus interest rate on your Savings Maximiser account. I forgot all about the 5 transactions in Dec 2019, and i frantically did 5x $1 partial payments on my groceries at Woolworths on 31 Dec 2019. Nope. too late. Visa takes a few days to settle the transaction over the NY period. My salary is deposited into my Maximiser account directly (>$2k a fortnight). i dont qualify for extra bonus because of the 5 card transactions, not the $1000 minimum deposit.
Look up Suncorp's savings account. One of them gives 1.95% if you deposit $200 per month + dont make more than 1 withdrawal per month. Works for me pretty well.
Just transfer the $200 to a non ING account and back again. Even easier if you have a spare $1000 and do it in one hit.