What's the rate of inflation in Oz? I assume you'll look at gov't figures, which I personally wouldn't trust, but not paying your loan to earn 1% per annum (assuming a 2~3% inflation rate) isn't very good.
If inflation is higher than 4% (real inflation, not gov't figures) then you're actually earning a negative rate of return when you add debt and inflation.
It's a government loan, so looking at the RBA should give the correct interest %, which is currently at 3.5% - last year I was charged under 3% on my HECS loan from memory.
You can get a variable rate at the moment from ING which is 6.1%, or you can go for a 1 year fixed at 5.6%.
20,000 * (0.061 - 0.035) = $520
OR
20,000 * (0.056 - 0.035) = $420
Is it a lot of money? No, not really. I can definitely understand why people would prefer to carry no debt at all, but there is also plenty of upsides to carrying some -smart- debt.
I also get the added flexibility of having that $20,000 available right now which could be used if I needed it for my business or there other Australian government schemes that I could put the money into that'd make sense if I wasn't already maxing those out (for example, we have a first home owners account. You can add $5,000 per year and the government will match it with an 18% contribution. Or I could add $1,000 per year into my pension account and the government will match that up to 150% depending on your income).
Not sure what you mean by this: 'If inflation is higher than 4% (real inflation, not gov't figures) then you're actually earning a negative rate of return when you add debt and inflation'?