A stress test checks whether your debt recycling plan still works if rates rise, an income stops or markets fall. It uses numbers you already have and shows how large your cash buffer should be.
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A stress test asks one question: could you keep every repayment going if things turned against you at the same time? It does not predict rates or markets. It measures how much room your plan has.
Debt recycling uses your home as security, so the test is about cash flow, not returns. If the strategy is new to you, start with how debt recycling works before running the numbers.
A useful test covers three shocks together:
Lenders already run a version of this. When you apply, they check whether you could meet repayments with the Australian Prudential Regulation Authority (APRA) serviceability buffer added. On 28 May 2026, APRA kept that buffer at three percentage points.
That check happens once, at application. It does not look at your budget a few years later, and it does not test a job loss or a falling market.
Moneysmart, run by the Australian Securities and Investments Commission (ASIC), suggests asking whether you could still afford repayments if rates rose by 2% or 4%. Our article on debt recycling when rates are high covers how a higher rate changes the maths.
You need your loan statements and your household budget.
Write down the repayment on every split, your living costs, insurance and any known bills over the next two years.
Recalculate each repayment at your current rate plus 2%, then plus 4%. These are test levels, not forecasts.
Run the budget without one income, or with the main income reduced, for a period you choose, such as six or 12 months.
Assume dividends, distributions or rent stop for a year. Moneysmart's guidance is to make sure you can cover living costs and repayments without them.
Assume your investments drop in value. The loan balance stays the same, so check you would not be forced to sell to meet repayments.
Leave any tax refund out. The deduction reduces tax after the year ends, so the repayments need to be affordable without it.
A $450,000 home split on principal and interest over 25 years, plus a $150,000 interest-only investment split. The rates are assumed for illustration only.
| Assumed Rate | Home Split | Investment Split | Total Each Month |
|---|---|---|---|
| 6% | $2,899 | $750 | $3,649 |
| 8% | $3,473 | $1,000 | $4,473 |
| 10% | $4,089 | $1,250 | $5,339 |
At the plus 4% level, this household needs about $1,690 more each month. That gap feeds straight into the buffer.
There is no single right number. Three approaches give you a range to work from.
Moneysmart suggests three months of expenses as a good emergency fund target. With an investment split as well as a home loan, you may want more.
Hold enough to cover every split's repayments, at your stressed rate, for a set number of months.
Multiply the monthly gap from your stress test by the months you want covered, then add known costs. In the example above, 12 months at $1,690 is $20,280 before anything else.
Moneysmart notes an offset account can serve as your emergency fund. Held in offset against the home split, the buffer also reduces non-deductible interest. Keeping it apart from the investment split is part of how we structure the loan.
A buffer inside the investment split is not a buffer. Redrawing it for living costs is new borrowing for a private purpose, and the Australian Taxation Office (ATO) requires the interest on a mixed loan to be apportioned.
Our guide to handling an income drop mid-recycle covers buffer sizing for parental leave, redundancy and reduced hours.
A failed test is useful information. It usually points to one of these changes:
If you are weighing this against a household budget, our debt recycling for home owners page shows how the strategy fits around a family's existing loan.
We arrange the lending and can show how a lender would assess each option. Whether and what to invest is for your financial adviser, and your accountant confirms the tax position.
Your numbers will not stay still. Re-run the test when rates move, when income changes, before you add a split, and when a fixed rate or interest-only period is due to end.
A stress test turns a vague worry into a number. Run it against higher rates, a lost income and a market fall, size the buffer from the gap it shows, and keep that cash in offset against your home split. If the plan only holds up when everything goes right, a smaller or slower start gives you more room.
We can show how a lender would assess your loans at higher rates and which structure leaves room to absorb a change.
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Written and updated byAlex GeeDirector & Mortgage Broker, Kingfisher Finance Group
Reviewed byJessica MaraisMortgage & Finance Broker, Kingfisher Finance GroupIt is a check of whether you could keep up every repayment if rates rose, an income stopped or investments fell. It measures the room in your plan, not likely outcomes.
It depends on your household. Moneysmart suggests three months of expenses as a starting target, and the gap shown by your own stress test gives a more specific figure.
In an offset account linked to your home split, or a separate savings account. Not inside the investment split, because redrawing it for living costs mixes private and investment debt.
Not on its own. The lender checks repayments once at application using APRA's serviceability buffer, while your own test covers income loss and market falls over time.
Moneysmart suggests checking whether you could afford repayments if rates rose by 2% or 4%. These are test levels, not predictions.
No. The deduction reduces tax after the year ends, so repayments need to be affordable without it.
Understand debt recycling risks, including market falls, higher rates, cash-flow pressure, tax errors and using your home as security.
Read more → GUIDEDebt recycling is powerful but it isn't for everyone. The situations where you should wait or walk away, from a licensed broker who says no when it doesn't fit.
Read more → GUIDEWhy a fixed loan cannot be split for debt recycling, what a break cost actually costs, and how to time the recycle around your fixed rate expiry.
Read more →
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