As a Mortgage Broker, my team and I would love to help you refinance and get a better rate. That said - you can always ASK your Bank for a better rate. I went into my bank to setup a New Business Bank account and they said "can we review your home loan". I said "Well we got a discount maybe a year ago", but we looked - and they gave an extra 0.16% on all loans. Doesn't sound like much but on $750,000 0.16% is $1,200 and on $1m it is $1,600. Or per $100k it is $160. This is PER YEAR. I could probably chose to lower my repayment, but I'm going to keep it AS IS - meaning that the EXTRA (which I'm not missing) will not be applied to PRINCIPAL - so it will cumulatively help me pay down my home loan quicker. So its not just $1,000 a year x 20 years left on your home loan = $20,000. It could be a lot more (maybe even $35k or $45k).

Your employer withholds tax from your salary (called PAYG - Pay As You Go Withholding) on the basic Australian tax tables. If you ticked that you have a HELP debt - they'll withhold an extra 1% ($48k) to 10% ($151k+) from your salary - to try to 'match' the required HELP debt repayment required when you lodge your tax return. Say you earn $155k = that is $15,500 extra they'll withhold. But say you only have nothing or maybe a smaller amount (say 3k) left on your help debt - you can tell them and going forward they won't withhold extra for HELP debt (and the extra will go into your pocket). If you want forced savings - you can tell your employer to split your salary into more than one account. Or simply set up an automatic transfer so you put the "extra" funds into savings. Or of course - put it in your offset account or make an extra repayment from your mortgage.