HECS-HELP: how repayments actually work

A HECS-HELP debt is the loan the government gave you to pay for uni. You don't repay it from your pocket on a schedule — it's collected through the tax system once your income passes a threshold, which the ATO adjusts each year.

Repayments are a percentage of your income, not a fixed amount. Below the threshold you pay nothing. As your income rises, the percentage rises in steps. This means a HECS debt behaves less like a normal loan and more like a higher marginal tax rate on income above the threshold.

The debt is indexed each year by inflation (CPI), not by an interest rate. In low-inflation years it barely grows; in high-inflation years it can jump. Crucially, indexation is applied to the outstanding balance, so voluntary extra repayments only beat indexation if they reduce the balance before indexation hits.

For most people, extra repayments are not worth it. The money you'd use to clear HECS early often earns more invested — in super or an index fund — than the indexation costs. Paying down HECS is a guaranteed 'return' of roughly CPI, which over long periods is usually below what diversified investments return.

There are exceptions. If you have a small balance and a lump sum, clearing it before indexation can be satisfying and risk-free. And if your income is just above a repayment threshold, salary packaging or extra super contributions can reduce your repayment income — but this is complex and worth getting advice on.

The practical default: make the compulsory repayments, direct spare cash to higher-interest debt and your emergency fund first, and only then consider voluntary HECS payments. It is cheap debt with flexible terms, and that is worth keeping.