HECS Debt vs Investing in Australia: Should You Pay It Off or Invest? (2026)

Author: Tepuy Solutions | Date: April 2026
Category: Strategy, Debt, Investing

HECS-HELP debt is widely described as "interest-free" — but that's not quite right. It's indexed annually to CPI, meaning it grows with inflation every June. In years of high inflation (like 2022–23, when CPI hit 7%), HECS balances grew by 7% overnight — faster than many savings accounts were paying. Understanding this distinction is the starting point for deciding whether voluntary HECS repayment or investing makes more sense for you.

How HECS-HELP Actually Works

HECS-HELP debt is repaid through the tax system once your income exceeds the repayment threshold — $54,435 in 2025–26. Mandatory repayments are a percentage of your income, ranging from 1% at the threshold to 10% for incomes above $151,201. These are collected through your tax return or PAYG withholding.

The debt is indexed on 1 June each year to the lower of CPI or the Wage Price Index (WPI). For 2024–25, CPI indexation was approximately 3.2%, meaning a $30,000 HECS balance grew by $960 before any repayments were made. For 2022–23, indexation was 7.1% — a $30,000 debt grew by $2,130 in a single year.

The Core Question: Voluntary Repayment vs Investing

Voluntary repayments reduce your HECS balance immediately, saving future indexation. The question is whether the "return" on that early repayment (avoided indexation) beats what you'd earn by investing the same amount.

In normal inflation environments (2–3%), the maths strongly favours investing over voluntary HECS repayment. At CPI of 7%+, the comparison is closer — but even then, high inflation typically means real investment returns are also compressed, so neither option is a clear winner.

The Mortgage Interaction (Important)

HECS debt is included in the lender's serviceability assessment when you apply for a home loan. Your mandatory repayment amount reduces the income available to service a mortgage, lowering your borrowing capacity — typically by $30,000–$60,000 in loan capacity per $10,000 of HECS balance, depending on the lender's assessment rate.

If you're planning to buy property in the next 1–2 years, paying down HECS first can unlock meaningful additional borrowing capacity — which may be worth more than the investment return you'd forgo. This is one case where voluntary HECS repayment genuinely wins on financial grounds.

The Case for Investing Instead

For most graduates who are not immediately buying property, the case for investing over voluntary HECS repayment is strong:

• HECS indexation (2–3% in normal years) < ASX returns (7–10% long-run). The gap is large enough to compensate for risk, especially over 5–10 year horizons.
• HECS gets paid off automatically. Mandatory repayments via PAYG mean the debt eventually disappears regardless. You don't need to rush it.
• Time in the market matters more. Starting a share portfolio at 25 vs 30 creates roughly 60% more compounding by retirement — the delay of investing while paying HECS has a larger long-run cost than the indexation savings.
• HECS debt doesn't compound like other debt. It grows only by CPI each year — it doesn't compound on itself the way a mortgage or credit card does.

The Case for Paying Off HECS

There are genuine situations where voluntary HECS repayment is the right call:

• Property purchase within 2 years. Paying HECS down increases your borrowing capacity, which in a rising market may generate more wealth than the foregone investment return.
• High inflation environments. When CPI indexation exceeds 5–6%, voluntary repayment becomes competitive with after-tax investment returns — especially for conservative investors who don't want market exposure.
• Psychological debt aversion. If carrying HECS debt causes genuine stress and prevents you from making other financial decisions clearly, paying it down may be the right call even if it's not optimal on paper.
• Nearing the end of your balance. If your remaining HECS is small (under $5,000), paying it off in a lump sum removes it from lender assessments and simplifies your tax return — a marginal administrative win worth considering.

Should You Split: Do Both?

One practical approach: invest enough to get compounding started, and let mandatory HECS repayments do their job. Don't make voluntary repayments unless you're buying property soon. This gives you the long-run investment compounding while your HECS gets repaid at a "CPI" cost — the cheapest debt you'll ever have.

2026 HECS Repayment Thresholds

• Repayment begins at $54,435 income (1% repayment rate)
• 2% at $62,739 | 3% at $66,077 | 4% at $70,024 | 5% at $74,223
• 6% at $78,871 | 7% at $84,432 | 8% at $90,099 | 9% at $96,028 | 10% above $151,201

On $80,000, approximately 5.5% of income goes to mandatory HECS repayment — about $4,400/year before any voluntary amounts. A $30,000 debt would be extinguished in roughly 6–7 years through mandatory repayments alone.

Disclaimer

This article is general information only. HECS-HELP thresholds, indexation rates, and repayment rates are set annually — verify current figures at studyassist.gov.au. Consider professional financial advice for decisions involving large balances or property purchases.