The borrower question behind this guide
A graduate on r/AusFinance asked whether to prioritise a house deposit or a substantial HECS balance after hearing it could affect borrowing power. The discussion exposed the missing calculation: how does paying the debt change both the mortgage assessment and the cash available to buy?
The examples below are fictional. They illustrate the decision, not the original poster's borrowing position or a lender offer.
Two limits have to work at the same time
Serviceability: can the lender support the required mortgage from your assessed income after expenses and commitments?
Purchase funding: can your cash and approved loan cover the property, duty, other costs and the reserve you want to retain?
HELP repayments can affect the first. Using savings to clear HELP changes the second. A capacity increase is useful only when the revised purchase still works.
Example 1: paying off HELP improves capacity but leaves a cash gap
Assume a $700,000 purchase, $100,000 savings, $20,000 buying costs and a $10,000 reserve. HELP payout is $20,000. The hypothetical lender has assessed the following limits; these amounts are assumptions, not outputs from an income multiple.
| Item | Keep HELP | Pay HELP off |
|---|---|---|
| Savings after HELP decision | $100,000 | $80,000 |
| Buying costs and retained reserve | $30,000 | $30,000 |
| Cash available towards the price | $70,000 | $50,000 |
| Mortgage required | $630,000 | $650,000 |
| Assumed assessed lending limit | $600,000 | $640,000 |
| Gap between required and supported loan | $30,000 | $10,000 |
The capacity improvement is $40,000, but the required mortgage also rises by $20,000. The buyer is closer to their target and still short. Any LMI and a change in pricing or acceptable LVR must also be included in the lender's final funding plan.
Example 2: paying it off can unlock the purchase
Keep the same price, costs and reserve, but start with $140,000 savings. Keeping HELP leaves $110,000 towards the price, requiring a $590,000 mortgage. If the assessed limit with HELP is $570,000, there is a $20,000 gap.
Paying the $20,000 HELP balance leaves $90,000 towards the price and requires a $610,000 mortgage. If the confirmed assessment without HELP supports $630,000, that second structure clears the servicing test. Property acceptance, LVR, insurance and the final costs still need to fit.
The useful question is how much net buying capacity improves after losing the payout cash.
Does a partial voluntary repayment help?
Compulsory HELP repayments depend on repayment income, rather than operating like the fixed monthly instalment on a personal loan. A smaller outstanding HELP balance therefore does not necessarily reduce the commitment used in a mortgage assessment.
Study Assist explains that voluntary payments are additional to compulsory repayments and are not refundable. Before making a partial payment, ask whether it changes the actual assessment, brings the debt into the lender's near-term repayment treatment, or simply reduces your available cash.
What if HELP will finish soon anyway?
APRA's current mortgage guidance allows a lender to consider a borrower whose HELP is expected to be cleared through compulsory payments within a short period, giving 12 months as an example. This is a lender policy decision, not an automatic entitlement.
Ask for that assessment before assuming you must spend the deposit to clear a small remaining balance. Supply the current ATO balance and the income evidence the lender requests. PAYG withholding shown on a payslip is not necessarily already credited to the displayed HELP balance.
Run the two calculations before paying
- Use borrowing power with the assessed HELP commitment included and removed. Enter base pay after income tax but before HELP withholding, so HELP is deducted once.
- Use deposit and buying costs with savings reduced by the actual payout.
- Compare the mortgage required, accepted LVR, confirmed costs and retained cash under each option.
For the other inputs lenders assess differently, read why borrowing capacity differs between lenders.
Sources and verification
- Borrower question: HECS versus saving a house deposit. Evidence of the question, not lending policy.
- APRA APG 223: treatment of HELP debt obligations.
- Australian Government Study Assist: loan repayments.
Reviewed 31 October 2026. Examples exclude a lender-specific assessment and assume the stated costs. Use confirmed figures for your purchase.
Make the next home loan decision with the numbers in front of you.
Tell us what you are buying, refinancing or trying to change. We can review the loan structure and lender options.
