HECS indexation on outstanding debt.
Indexation this year
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Balance after indexation
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The one day a year your study debt grows
A HECS-HELP debt does not charge interest in the ordinary sense. Instead it is indexed once a year, on 1 June, to keep pace with the cost of living. For years that indexation tracked inflation alone, and when inflation spiked in 2023 and 2024 borrowers watched their balances jump uncomfortably. The government responded with a reform: from 2023 onward, indexation is applied at the lower of the Consumer Price Index and the Wage Price Index, so your debt can never grow faster than wages are rising. This tool shows how much indexation your balance attracts in a given year and what a voluntary repayment before the deadline saves you.
The mechanics matter. Indexation applies to whatever balance remains on 1 June. Any voluntary repayment you make before that date shrinks the amount that gets indexed, which is the single most useful timing trick available to anyone carrying a study debt.
Timing a $5,000 repayment on a $30,000 debt
Suppose you owe $30,000, indexation this year is running at 4 percent, and you have $5,000 spare. If you pay that $5,000 in before 1 June, only the remaining $25,000 gets indexed. Compare that with doing nothing.
| Scenario | Indexed balance | Indexation at 4% |
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The $5,000 payment does two things: it clears $5,000 of debt and it stops $200 of indexation that would otherwise have been added on top. After indexation, the early-repayment balance sits at $26,000, while the do-nothing balance climbs to $31,200. The chart puts the two indexation amounts side by side so you can see the saving the timing buys.
Why paying early is not always the smart move
Here is where good judgement beats blind enthusiasm. Indexation is not the same as a market interest rate, and in low-inflation years it can be lower than what your money would earn elsewhere. If indexation is running at 3 percent and your offset account or investments are doing better than that after tax, voluntarily smashing your HECS can cost you in opportunity terms. The debt also has unusually friendly features: it never affects your credit file, it is wiped on death, and compulsory repayments only kick in once your income passes the first threshold, currently around $51,550. For a borrower whose income sits below that line, there are no forced repayments at all.
The compelling case for an early repayment is a year of high indexation combined with cash you are not putting to better use. A frequent mistake is making a voluntary payment in early June, just after indexation has already been applied, and assuming it helped this year. It did not. To dodge a given year's indexation, the money has to clear before 1 June, and the ATO needs time to process it, so aim to pay well before the deadline rather than on it.
Who this tool helps most
This is for graduates weighing whether to throw spare cash at their study loan before the annual indexation date. It is a single-year snapshot, designed to quantify the immediate indexation hit and the saving from an early payment, rather than a full repayment projection over your career. Pair it with your expected income to understand the bigger picture, since your compulsory repayments through the pay-as-you-go system will also chip away at the balance throughout the year, separate from any voluntary amount you choose to add.
Do my compulsory repayments reduce the indexed balance?
Not always in time. Compulsory repayments withheld from your salary during the year are usually only applied to your loan after you lodge your tax return, which can be after 1 June. That means the money has been taken from your pay but has not yet reduced the balance being indexed. Making an extra voluntary payment before 1 June is the reliable way to lower the indexed figure for that year.
What rate will indexation be this year?
It is set each year as the lower of the Consumer Price Index and the Wage Price Index, measured over the relevant period, and announced shortly before 1 June. Recent years have ranged from roughly 3 to 4 percent under the lower-of rule. The tool lets you enter the rate yourself so you can model the official figure once it is published or stress-test a higher number.
Is HECS indexation tax deductible?
No. HECS-HELP indexation and repayments are not tax deductible, and self-education expenses for your current job are claimed separately under their own rules. Do not assume your study debt gives you a deduction, because it does not. The benefit of an early repayment is purely the indexation you avoid, which is exactly what this calculator measures.