Should I Pay Off My HECS-HELP Debt Early or Invest Instead in Australia?

HECS-HELP debt sits differently to other debts. It carries no interest, only indexation to CPI, and repayments are compulsory once your income crosses the threshold. But when you have spare cash, should you make voluntary repayments or invest that money instead? The answer depends on indexation rates, your marginal tax rate, expected investment returns, and your financial goals.

Quick Comparison

Factor	Pay Off HECS-HELP Early	Invest Instead
Cost	Indexed to CPI annually (1 June)	Investment returns vary, taxed at marginal rate
Certainty	Guaranteed elimination of indexation	Returns uncertain, market risk applies
Tax treatment	Voluntary repayments use after-tax dollars	Super contributions concessional at 15%, outside super taxed at marginal rate
Flexibility	Debt gone, frees up future income	Money remains accessible (outside super)
Compounding	Saves future indexation	Potential for higher long-term growth
Best for	High HECS balance, high indexation years, debt aversion	Long investment horizon, disciplined savers, lower indexation environment

Option 1: Pay Off HECS-HELP Early

Making voluntary repayments eliminates your debt faster and stops indexation from compounding. According to the Australian Taxation Office, HECS-HELP debts are indexed on 1 June each year to the Consumer Price Index (ATO, 2026). In high-inflation years, indexation can exceed 7%, making early repayment attractive.

Pros:

Guaranteed “return” equal to the indexation rate (you avoid that cost)
Psychological benefit of being debt-free
Frees up cash flow once compulsory repayments stop
No market risk or volatility
Particularly valuable if you plan to take parental leave, work part-time, or drop below the compulsory repayment threshold, as indexation continues regardless of income

Cons:

Uses after-tax dollars (you have already paid income tax on that money)
Opportunity cost if investment returns exceed indexation
Reduced liquidity (once paid, you cannot access that money again)
Compulsory repayments already reduce the balance over time anyway

Example: You have a $30,000 HECS-HELP debt. Indexation at 4.7% (2023 rate) adds $1,410 in one year. A $10,000 voluntary repayment saves you indexation on that portion going forward.

Option 2: Invest the Money Instead

Investing surplus cash, whether in superannuation or outside super, offers the potential for higher long-term returns. As covered in Principles of Finance, the time value of money and compound growth often favour investing over debt repayment when the debt carries a low effective cost.

Pros:

Potential returns above indexation (historically, diversified portfolios have returned 7% to 10% per annum over the long term, though past performance is not a reliable indicator of future performance)
Concessional tax treatment in super (contributions taxed at 15% vs your marginal rate, which can be 32.5%, 37%, or 45%)
Builds wealth and retirement savings simultaneously
Flexibility to access funds if held outside super (emergency fund, house deposit)
HECS-HELP debt is automatically forgiven on death, so the balance never transfers to your estate

Cons:

Investment returns are uncertain and subject to market volatility
Capital gains and income taxed at marginal rates (outside super)
Requires discipline (money must actually be invested, not spent)
Indexation continues to grow your HECS balance in the meantime
Super is locked until preservation age (currently between 60 and 65 depending on your birth year)

Example: You salary sacrifice $5,000 per year into super instead of making voluntary HECS repayments. At a 37% marginal tax rate, that $5,000 costs you $3,150 in take-home pay (you save 34% tax vs paying with after-tax dollars, as super contributions are taxed at 15%). Over 20 years at 7% annual return, that $5,000 yearly contribution compounds to approximately $219,000 (before fees, assumes consistent contributions).

Recommendation by Profile

Pay off HECS-HELP early if:

Indexation rates are high (above 5% to 6%)
Your HECS balance is relatively small (under $20,000) and you can clear it quickly
You have strong debt aversion and the psychological weight affects your wellbeing
You are close to retirement and want to eliminate liabilities
Your income is approaching a higher tax bracket and clearing HECS reduces your compulsory repayment rate
You expect your income to drop soon (parental leave, career break, part-time work) and want to minimise indexation while you are still earning well

Invest instead if:

Indexation is moderate (below 4%) and you expect investment returns to exceed it over time
You are young with a long investment horizon (20+ years until retirement)
You are a disciplined saver who will genuinely invest the money, not spend it
You have access to concessional superannuation contributions and are in a higher tax bracket (tax saving of 17.5% to 30% on contributions makes super very attractive)
You have other financial goals (house deposit, emergency fund) that investing supports
Your HECS balance is large (above $50,000) and would take many years to clear, during which time invested funds can compound

Hybrid approach: Many Australians split the difference: make modest voluntary repayments (say, $2,000 to $5,000 per year) to reduce indexation exposure, while directing the majority of surplus cash to superannuation or other investments. This balances certainty with growth potential.

General Advice Warning

This article provides general information only and does not constitute personal financial advice. It has been prepared without taking into account your objectives, financial situation or needs. Before acting on any information in this article, you should consider whether it is appropriate for you and seek advice from a licensed financial adviser if necessary.

Conclusion

There is no universal right answer. Paying off HECS-HELP early guarantees you avoid indexation and provides peace of mind. Investing offers the potential for higher returns, particularly through concessional superannuation contributions, but carries market risk and requires discipline. ASIC MoneySmart recommends comparing the effective cost of any debt against expected investment returns and your personal risk tolerance (MoneySmart, 2026).

Review indexation rates each year (published by the ATO in late May), assess your marginal tax rate, and consider your broader financial goals. If indexation is running at 3% and you can earn 8% in a diversified portfolio, investing is likely the better long-term choice. If indexation spikes to 7% and markets are volatile, early repayment becomes more attractive. Most importantly, ensure any decision fits your specific circumstances. Consult the ATO for current HECS-HELP rates and thresholds, and speak to a licensed financial adviser or registered tax agent if you need personalised guidance.