HECS Borrowing Power Impact Calculator Australia

What the hecs borrowing power calculator does

This hecs borrowing power calculator runs your home loan serviceability twice: once with your compulsory HELP repayment deducted, and once as though the debt did not exist. The difference between the two figures is what your study debt is costing you in borrowing capacity right now.

It is the question almost every graduate asks before their first property purchase, and the answer is rarely the one people expect. The size of the balance matters far less than the size of the income, because the compulsory repayment is worked out from what you earn, not from what you owe.

How HELP repayments are assessed

Since 1 July 2025 the compulsory repayment has been a marginal calculation rather than a cliff. Nothing is payable below the first threshold. Above it, a percentage applies only to the income in each band, in the same way income tax works. A pay rise that pushes you over a threshold no longer triggers a jump in your whole repayment.

The income used is your repayment income, which is broader than salary. It adds back reportable fringe benefits and reportable employer super contributions, along with net investment losses and exempt foreign income. Two people on the same base salary can therefore face different compulsory repayments if one salary packages heavily.

The calculator takes the compulsory repayment from your net income, not your gross, because that is the money that actually leaves your bank account each month and is unavailable to service a mortgage.

How lenders treat the debt

Australian lenders assess a home loan by working out a monthly surplus and then asking how large a loan that surplus could repay. The surplus is your net income less living expenses, less any existing credit commitments, and a HELP repayment sits squarely in that last category.

Two features of the process amplify the effect:

• The assessment rate. Lenders add a buffer to the actual interest rate, so your surplus is tested against a higher repayment than you would really make. A smaller surplus discounted at a higher rate compounds the reduction.
• The long term. Over a thirty-year term, a modest recurring outgoing capitalises into a surprisingly large amount of principal, which is why a few hundred dollars a month can move the maximum loan by tens of thousands.

The result is that the reduction in borrowing power is usually several times the annual repayment figure, not equal to it.

The threshold effect people miss

Because the repayment is calculated on income, a borrower on a modest salary just above the first threshold loses very little capacity, while a high earner with the same balance loses a great deal. Someone earning well above the second threshold can be paying five figures a year in compulsory repayments on a balance they could clear with a single lump sum.

That produces a clear decision rule. If your balance is small enough that you can pay it out entirely before applying, doing so removes the repayment from the lender's assessment and restores the full borrowing capacity. If the balance is large, partial payments do nothing for serviceability, because next year's compulsory repayment will be the same percentage of the same income. In that case the money is usually better kept as deposit, where it reduces the loan required and improves the loan-to-value ratio.

What you need to enter

To get a realistic figure, have these ready:

• Your gross annual salary, plus any other reliable income.
• Your current HELP or HECS balance.
• Your genuine monthly living expenses, not an optimistic number.
• The interest rate you expect to be offered and the loan term.

The advanced fields let you refine the result. The serviceability buffer defaults to a typical regulatory margin, existing repayments capture car loans and personal loans, and reportable fringe benefits lift your repayment income without adding cash. Adding a deposit turns the maximum loan into an indicative purchase price.

Be honest with the expenses figure. Lenders apply a household expenditure benchmark as a floor, so understating your spending here produces a number that no bank will match.

Reading your result

The headline is your maximum loan with the HELP debt in place. Alongside it sit the debt-free figure and the gap between them, which is the real cost of the study debt in property terms.

The monthly surplus figure is worth watching closely, because it is the lever with the most movement in it. Cutting recurring expenses or clearing a small car loan often improves capacity more than anything you can do about the HELP balance, and unlike the study debt those changes are within your control in the short term.

The repayment rate output shows what share of your income the compulsory repayment consumes. Watching that number rise as income grows explains why borrowing power does not scale as smoothly with salary as people assume.

When to use this tool

Run the numbers when you want to:

• Quantify what your HELP debt costs before you talk to a broker.
• Decide whether clearing a small balance is worth the cash.
• Compare a salary increase against the extra repayment it triggers.
• Set a sensible price ceiling before you start inspecting properties.

Because the result moves with income, interest rates and expenses, it is worth revisiting whenever any of those change rather than treating a single figure as fixed.

This is general information only and not financial advice.

About This Tool: HECS Borrowing Power

HECS borrowing power: use this tool to get an instant, accurate estimate. The figures follow official ATO guidance and every rate and threshold is kept up to date for 2026. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.