I preload and then pay usually. With WA land tax there was a $100,000 payment limit so I had to pay that one more than once. With other payments just load up every couple of minutes. Westpac to St George you have to wait at least a day for the funds to arrive.
Some newer members have smaller BPay limits than $100,000 a time.
Some newer members have smaller BPay limits than $100,000 a time.