An $80,000 HECS balance can cost you six figures in borrowing power. Not because of the balance itself, but because of the slice the ATO takes from your pay, and how a bank's calculator treats it. Three rule changes since August 2025 have rewritten how HECS debt affects your home loan borrowing power, and they stack in your favour: your balance is smaller, your compulsory repayments are calculated differently, and some lenders can now leave a near-cleared HELP debt out of the assessment altogether. Most graduates haven't re-run their numbers on any of the three.
The market backdrop makes this a preparation window, not a race. The RBA lifted the cash rate to 4.35% across three hikes in February, March and May 2026, then held in June, with the next decision due on 11 August 2026. Higher rates have thinned the buyer pool: Cotality's June 2026 data puts auction clearance rates in the low 40s. Fewer bidders means more negotiating room for the buyers who arrive prepared. Knowing your real borrowing power, before spring, is the preparation.
Why does HECS debt shrink your home loan borrowing power?
Lenders barely glance at your HELP balance. They care about the repayment. Once your income crosses the repayment threshold, the ATO withholds compulsory repayments from each pay, and a lender treats that money like any other ongoing commitment: dollars that can't service a mortgage. From the 2026-27 income year the threshold sits at $69,528, and repayments are marginal, at 15 cents for each dollar you earn above it, rather than a percentage of your whole salary.
On $105,000, that works out to about $5,300 a year, or roughly $445 a month. Small against a registrar's payslip. Not small on a serviceability calculator: assessed at your actual rate plus APRA's 3% buffer (reconfirmed at its 28 May 2026 review), a $445 monthly commitment can strip roughly $75,000 from what a lender will offer you.
Your HECS balance is checked baggage: light to carry day to day, heavy on the bank's scales. The full mechanics of how lenders turn income and commitments into a lending figure are in our guide to borrowing capacity.
What did the 20% HELP wipe change?
In August 2025, Parliament legislated a 20% cut to outstanding HELP balances. A $70,000 debt became $56,000 overnight. No paperwork, no application; anyone carrying a study debt got the reduction automatically, straight off the ATO's ledger.
You've probably been told to clear your HECS before you buy. For most graduates, that advice is now backwards. The wipe did the first $14,000 of the work for you, and because compulsory repayments are set by your income rather than your balance, your monthly commitment didn't move while your clearance date jumped years closer. Closer matters more than you'd expect, because of the third change below.
One reframe worth sitting with: a HELP debt isn't read the way a car loan is. It's evidence you trained into a registered profession with a rising pay scale, the kind of income story credit assessors like. The debt shrank. The career it bought didn't.
Can lenders now ignore your HELP debt?
From 30 September 2025, yes, in one specific case. Updated regulator guidance lets lenders exclude a HELP debt from serviceability when it sits within roughly 12 months of being cleared. The effect shows up fast in the numbers: CBA, the first major bank to apply the change, reported eligible borrowers gained around 21% more borrowing capacity. That's a market fact rather than a recommendation, and policies differ lender to lender; most still count debts with longer to run.
Exclusions don't apply themselves, either. We've watched applications go in with a HELP debt keyed as a full liability when the balance had ten months left on it, and the capacity figure came back tens of thousands lighter than it needed to be.
Stack the three changes and the picture looks like this:
| Change | In force | What it does to your borrowing power |
|---|---|---|
| 20% HELP balance wipe | Legislated August 2025 | A $70,000 debt drops to $56,000, pulling clearance years closer |
| Marginal repayment threshold | 2025-26 income year; $69,528 in 2026-27 | Repayments run at 15c per $1 over the threshold, trimming the monthly commitment lenders count |
| Near-cleared debts excluded | From 30 September 2025 | Lenders may ignore HELP debt within ~12 months of payout; eligible borrowers at one major bank gained ~21% capacity |
Follow the chain through. The wipe pulled your clearance date forward. The marginal threshold shrank the repayment lenders count in the meantime. And the exclusion rule means the last stretch of your debt can vanish from the assessment before it vanishes from your myGov account. Where you sit on that timeline decides which lender suits you, and when to apply.
How much more could one registrar borrow?
Dr Priya Mehta is a first-year registrar at Brisbane's PA Hospital on a $105,000 base, looking at units around Woolloongabba. She started 2025 owing $70,000 in HELP debt; the wipe took it to $56,000. The ATO withholds about $445 a month from her pay.
At a typical bank, that $445 stays in the calculation for years yet, because at today's pay her balance is close to a decade from clearing, well outside the 12-month exclusion window. Capacity: roughly $475,000.
Under the specialist medico policy available through Wity, her HELP debt is excluded from the calculation regardless of the balance or the clearance date. Capacity: roughly $550,000. The same payslip supports $75,000 more of Woolloongabba, alongside a 5% deposit pathway at up to 95% LVR with LMI waived, and if she can evidence her consultant pathway, future income can lift the figure again. The whole policy is unpacked in our doctor home loan guide.
Based on typical scenarios. Individual outcomes vary.
Should you pay off HECS before you apply?
For doctors and dentists, usually not. Our medico policy excludes the debt from the calculation anyway, so $20,000 sent to the ATO does nothing for your capacity that the policy hasn't already done, while the same $20,000 held as deposit brings settlement closer or trims your LVR. Keep the cash working for you.
For nurses, allied health and graduates outside medicine, the answer has a threshold in it. A voluntary repayment that pulls your clearance date inside roughly 12 months can flip the debt from counted to excluded at some lenders, and your capacity can jump the way the early numbers suggest. A repayment that leaves you outside the window spends your savings for no serviceability gain at all. The Wity Borrowing Power Assessment models both paths across 45+ lenders, not one bank's calculator, so you can see the exact balance where the switch flips before you send the ATO a cent.
What should you do before the next RBA decision?
Three steps this month, in order. Pull your post-wipe HELP balance from myGov; plenty of graduates are still quoting their 2024 figure to brokers. Work out your clearance horizon at your current repayment rate. Then re-run your borrowing power with the new inputs rather than assuming last year's answer still holds; if this is your first purchase, our first home buyer guide covers the deposit schemes that stack on top.
The stretch between now and the RBA's 11 August 2026 decision is quiet. Quiet suits prepared buyers.
Want to see how the three changes land on your numbers? Start the Wity questionnaire → — free, no credit check, two minutes. The full policy detail lives on our Home Loans for Doctors & Dentists page.
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