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The Long-Term Cost of HECS Debt — 20-Year Projections (FY2025-26)

By , Melbourne Read: 4 min Checked against: ATO, Study Assist

Short-term, HECS looks cheap. Over 20 years, indexation compounds. This guide models the real long-term cost under the post-2024 CPI/WPI cap AND the new FY2025-26 marginal repayment system (nil / 15c / 17c / 10%), after the 20% one-off HELP balance cut applied on 1 June 2025.

The short answer

Under the current rules — indexation capped at the lower of CPI or WPI (2–4% typical), the new $67,000 threshold with marginal 15c/17c/10c rates, and the 20% balance reduction already applied — a typical $32,000 post-cut HECS balance takes 7 to 13 years to fully repay for a graduate whose income trajectory is normal (starting $72k, rising to $125k over 10 years). Total indexation paid across that period: $6,500 – $11,000, materially less than under pre-2025 rules.

Three FY2025-26 scenario projections

All three scenarios use a 3% projected long-run indexation rate and assume the 20% cut has already been applied.

Scenario A: fast payer — $32,000 start (post-cut), $95,000 starting income

Under the new marginal system, repayment at $95,000 = 15c × ($95,000 − $67,000) = $4,200 per year. With 3% indexation, balance trajectory: Y1 end $28,160 ($32,960 after indexation less $4,200 repayment plus income growth). Income rises to ~$120k by Y6, repayment ~$9,000; Y8 balance below $5,000. Debt cleared at Year 8. Total indexation paid: roughly $5,800.

Scenario B: average payer — $32,000 start, $72,000 starting income

Rate at $72,000 = 15c × $5,000 = $750/year — far lower than the old 3% whole-of-income figure. Indexation ($960 at 3%) exceeds repayment in Y1, balance grows slightly. Income rises to $85k by Y3 (repayment $2,700), crosses $100k by Y6 (repayment $4,950). Debt cleared around Year 12. Total indexation paid: roughly $9,500.

Scenario C: slow-starter — $48,000 start, $65,000 starting income

At $65,000, below the $67,000 threshold — zero compulsory repayment. Balance indexates only. Y1 $49,440, Y2 $50,923, Y3 $52,451. Income crosses $67k in Y3 (now $75, repayment $1,200); repayment climbs as income grows. Debt cleared around Year 19. Total indexation paid: $22,000+ over 19 years — still materially below the pre-reform equivalent because the marginal system doesn't punish you the moment you cross the threshold.

How the 20% cut and marginal system changed long-term cost

For identical income trajectories, a graduate in FY2025-26 pays roughly 30–45% less total indexation over the life of the debt than the equivalent graduate would have under FY2024-25 rules. Two effects stack:

  • 20% smaller starting balance → 20% less indexation per year → 20% less total indexation.
  • Marginal repayment formula → lower repayment at low-to-middle incomes means more principal outstanding longer early in the career. But the total saved in repayment usually flows into higher voluntary repayments or investments that more than offset the extra indexation.

What drives total cost

  1. Starting balance. Linear — double the balance, double the time to pay.
  2. Income trajectory. Higher and faster growth means you cross the 15c and 17c brackets earlier, repaying more principal while indexation is still low in dollar terms.
  3. Indexation rate. The CPI/WPI cap limits the worst case, but steady 3% over 20 years still doubles an untouched balance.
  4. Voluntary repayments. Strategic voluntary payments before 1 June in high-indexation years cut lifetime cost the most.

What this means for the early-repayment decision

For graduates in Scenario A, HECS is cheap — roughly $5,800 over 8 years on a $32,000 post-cut balance is 18% of starting balance, comparable to low-rate personal loan interest. Paying early only makes sense if your after-tax return can't beat projected 2.5–3.4% 2026 indexation.

For graduates in Scenario C, total indexation cost of $22,000+ is significant. Aggressive voluntary repayment while income is rising can cut that by half — our voluntary repayment calculator models exactly this against investing the same money.

Tips & Tricks

Pay off HECS faster — actionable tactics

Hand-picked strategies Australian graduates actually use. Each one can be implemented this financial year — no gimmicks, no affiliate links.

  1. 01

    Chuck a voluntary payment in before 1 June

    This one's the big one. Indexation hits on 1 June, and it only applies to whatever is sitting on your balance that day. If you transfer, say, $5,000 in the last week of May, indexation at 3.4% never touches that $5k — so you save around $170 in one go. I did this three years running and it's the single easiest win.

    Do this: Grab your PRN from myGov → ATO → Loan Accounts, then BPAY it. Do it 5 business days before 1 June — banks can be slow.

  2. 02

    Tick the HECS box on your TFN declaration

    Your employer only withholds extra tax for HECS if you tell them you have a debt. I've met grads who got smacked with a $9,000 bill at tax time because they never ticked the box — their payroll had no idea. Getting it withheld from each pay is way less painful than one brutal June invoice.

    Do this: Email payroll and say: "Please update my TFN declaration to indicate I have a HELP debt." Sorted next pay cycle.

  3. 03

    Add your fringe benefits and super to your income estimate

    The ATO uses "repayment income" — not just your salary. It adds back reportable fringe benefits (novated lease is the big one), reportable employer super, net investment losses, and exempt foreign income. A mate of mine on a $95k salary with a $12k novated lease tipped into the 15% bracket and was furious when the letter arrived.

    Do this: Check your last payment summary, grab the RFBA number, and add it to your gross before using the calculator.

  4. 04

    Don't part-pay your HECS before applying for a home loan

    This catches loads of people out. Banks only drop HECS from their serviceability calc when your balance is exactly zero. If you have $25k and pay $20k of it, the bank still assumes the full monthly commitment. Total waste unless you're clearing it completely — and if your balance is under $7–8k you might as well, since clearing it unlocks roughly $160 of borrowing capacity for every $1 of monthly HECS you remove.

    Do this: Balance under $8k and you're six months from a home loan? Clear it. Over $15k? Don't touch it — keep the cash for your deposit.

  5. 05

    If your investments beat indexation after tax, invest instead

    Indexation is capped at the lower of CPI or WPI — roughly 2.5–3.4% heading into 2026. A basic ASX/global ETF returning 7% pre-tax works out at about 4.8% after tax in the 32.5% bracket. Over 10 years, investing $20,000 instead of repaying it early can leave you $4,000–$7,000 ahead. HECS has no interest, just indexation — it's one of the cheapest "debts" you'll ever have.

    Do this: Run the numbers yourself in the Voluntary vs Invest calculator using your actual marginal tax rate before you decide.

  6. 06

    Don't expect salary sacrifice to shrink your HECS bill

    This is the most common bit of dodgy advice I hear. Yes, salary sacrificed super lowers your taxable income — but the ATO adds it back as "reportable super" when working out HECS. Novated leases reduce taxable income too, but they also create a Reportable Fringe Benefit (RFBA) that adds back in. Net effect: salary sacrifice is basically HECS-neutral. Use it for its super-tax benefits, not to dodge HECS.

    Do this: If someone tells you salary sacrifice will drop your HECS, ask them to show you the ATO page on repayment income. It won't.

  7. 07

    Moving overseas? Tell the ATO within 7 days

    Your HECS debt doesn't stay in Australia when you do. If you leave and earn above the AUD threshold ($67,000 for FY2025-26) you're still liable — and you have to lodge a worldwide income declaration each year. Skip it and you cop penalties plus interest. I've seen Aussies come back from London with five years of missed declarations and a $12k penalty bill on top.

    Do this: Before you fly, log into myGov → ATO → Update contact details → tell them you're moving. Lodge worldwide income by 31 October each year.

  8. 08

    Redirect your tax refund or bonus to HECS in May

    Lump-sum cash — your July tax refund, an annual bonus, EOFY commission — is the stuff that vanishes on random takeaway and holidays. If you route half of any big deposit straight to HECS in April or May, you wipe out a year of indexation on that chunk and you never miss the money because it was never in your everyday account.

    Do this: Set a rule with yourself: any single deposit over $2,000 in April or May gets split 50/50 — half to HECS via BPAY, half to your offset. Automate it if you can.

Frequently Asked Questions

How much does HECS cost over a career in 2026?
For a graduate with a $32,000 post-20%-cut balance on an average income trajectory ($72k → $120k over 10 years), total indexation paid across the life of the debt is $6,500–$11,000 under the current CPI/WPI cap plus new marginal repayment system. Lower income trajectories double that figure because repayment starts only above $67,000.
Does HECS ever become "free money"?
No. Every dollar borrowed must be repaid, plus indexation over the years the debt is outstanding. The 20% one-off cut applied on 1 June 2025 was exceptional and has already happened — there is no current proposal for a further one-off reduction. The only other write-offs are death, permanent disability, and specific employer schemes.
Is HECS worse than a bank loan?
No. Under the CPI/WPI-capped indexation and the FY2025-26 marginal repayment system, HECS is the cheapest loan an Australian can access — lower cost than any commercial student loan, personal loan, credit card or car loan. Its income-contingent repayment structure also protects you during unemployment or low-income periods.
Did the 20% cut actually reduce long-term cost?
Yes, by roughly 20% in indexation paid over the life of the debt, plus the direct $x of balance removed. On a typical $40,000 pre-cut debt, the 20% cut saved about $8,000 of principal plus ~$3,000–$5,000 of avoided future indexation over the remaining repayment period.
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