I've always followed the wisdom that your HELP/HECS loan is the cheapest loan you will ever get and you should only make the compulsory repayments. However, with the drop in interest rates I'm not sure this is the best way to go.
I currently have 60k in a HISA that I'd been building for a deposit on a home and a ~50k HELP debt. For simplicity let's say I have 50k of each
RAMs current interest rate is 2% so over a year
50,000 * 1.0202(effective rate) = 51010
Then you need to pay tax on that interest
1010 * 0.63 (depending on bracket) = 636.3
So you come out of the year with $636.30
However the increase on the loan due to indexation is
50,000 * 1.018 (2019 indexation rate) = 50,900
So by not paying off the HELP loan you're ~$264 worse off.
Am I missing something? Obviously there's higher interest investment than a HISA at the moment but if you're after low risk seems to me you're better off paying off the HELP loan than letting the money sit there.
You can't outperform the taxman at the higher tax brackets.