Around one in five Australian housing investors carries debt more than six times their income, a level the Reserve Bank considers higher risk. That figure matters whether you already own an investment property or are thinking about buying your first home. The same research shows investors have historically defaulted less than owner-occupiers, but Australia has not faced a severe housing downturn that would truly test those debt levels.
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This article is general information only and does not constitute professional advice. For your specific situation, consult a qualified professional.
What these numbers reveal is a gap between how financially resilient people look on paper and what happens when things shift — interest rates, rental demand, or personal circumstances. The investor population is ageing, with more than a quarter now over 60, and around 80% of multi-property investors hold all their properties within a single state. That concentration means a local downturn could hit hard. Here’s what you actually need to know.
What This Article Reveals About Housing Financial Risk
The central concept here is debt-to-income ratio — how much you owe compared to what you earn. It’s the single most telling measure of financial risk in property, and most people don’t know theirs.
What I tend to notice is that people focus on the purchase price and the deposit, but rarely run the DTI calculation until a lender forces them to. That’s backwards — the DTI tells you whether the loan is actually manageable, not just whether you can scrape together a 20% deposit. For a deeper look at what happens when loan terms get confusing, the guide to mortgage payment grace periods covers what lenders actually offer when you fall behind.
The Full Cost Picture: What Headline Prices Don’t Tell You
The purchase price of a property is never the only number that matters. For investors, the gap between the advertised price and the real cost can be substantial. The big four banks make an estimated $229,000 in profit on the average 30-year owner-occupier home loan, according to analysis from the Australia Institute. That figure alone should make anyone pause and look at the total cost of borrowing, not just the monthly repayment.
Stamp duty, legal fees, survey costs, lender’s mortgage insurance (LMI), and ongoing costs like strata fees, council rates, and maintenance all add up. For an investment property, you also need to factor in vacancy periods, agent management fees, and potential repair bills. The RBA notes that investor debt-to-income ratios are generally higher than those of owner-occupiers, and around one-fifth of investors had high housing debt relative to income in 2021.
Here’s a scenario that shows how the full cost differs from what buyers typically expect. Say you buy a $600,000 property with a 20% deposit ($120,000). You borrow $480,000 at 6% over 30 years. The total interest paid over the loan term is roughly $555,000 — more than the original purchase price. Add stamp duty (around $25,000 in most states), legal fees ($2,000), and LMI if your deposit is under 20%, and the total cost of ownership can easily exceed $1.2 million for what looked like a $600,000 purchase.
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| Cost Component | Owner-Occupier | Investor |
|---|---|---|
| Purchase price (example) | $600,000 | $600,000 |
| Stamp duty (approx) | $25,000 | $30,000+ |
| Legal & conveyancing | $2,000 | $2,500 |
| LMI (if <20% deposit) | $15,000–$25,000 | $18,000–$30,000 |
| Total interest over 30 years | $555,000 | $600,000+ |
| Ongoing annual costs | $5,000–$10,000 | $10,000–$20,000 |
If you’re trying to get a handle on these figures before committing, a service like JustAnswer Finance can help you talk through the numbers with someone who deals with property finance questions daily. It’s not a substitute for professional advice, but it can clarify what you’re actually looking at.
Where Buyers and Investors Get This Wrong
Treating family money as free money
The Money.com.au survey found that 64% of first-home buyers who received family financial support had no formal agreement — only a verbal understanding or a handshake. That’s a problem because family dynamics change. If the property is sold, the owners separate, or the family member who helped needs the money back, a verbal agreement offers no legal protection. A simple written loan agreement or deed of gift, reviewed by a solicitor, costs a few hundred dollars and prevents disputes that can cost tens of thousands. If you’re in this situation, a JustAnswer Legal consultation can walk you through what a basic agreement should include.
Ignoring the debt-to-income ratio
The RBA data shows that around one in five investors has debt over six times their income. That’s considered higher risk, but most people don’t calculate their DTI until they apply for a loan. By then, it’s too late to adjust. The problem is that a high DTI limits your ability to refinance when rates change. If your DTI is above six and rates rise, you may not qualify for a better deal elsewhere. The fix is to calculate your DTI before you borrow, not after. If it’s above five, consider a smaller loan or a larger deposit.
Misunderstanding LVR and LMI
Loan-to-value ratio (LVR) was the most misunderstood term in the Money.com.au survey, with 26% of homeowners not understanding it. Lender’s Mortgage Insurance (LMI) was misunderstood by 16%. Here’s what happens mechanically: if your deposit is under 20%, the lender charges LMI to protect themselves if you default. That insurance can cost $15,000–$30,000 on a typical loan, and it protects the lender, not you. Many buyers don’t realise that LMI is a one-time premium added to the loan amount, meaning you pay interest on it for 30 years. The only way to avoid it is a 20% deposit or a guarantor arrangement.
Overlooking single-state concentration risk
The RBA found that around 80% of multi-property investors hold all their properties within a single state. That means a local downturn — a mining bust, a regulatory change, or a natural disaster — can wipe out the value of an entire portfolio. Diversifying across states spreads that risk, but it also adds complexity in managing properties remotely. The trade-off is real, but the concentration risk is rarely discussed at the point of purchase.
How to Assess and Manage Housing Financial Risk
Calculate your true debt-to-income ratio
Start with your total housing debt — the amount you owe on your home loan plus any investment property loans. Divide that by your annual pre-tax income from all sources. If the result is above six, you’re in the higher-risk category the RBA flags. The calculation is simple but most people never do it. Write down the number and check it against APRA’s guidance. If you’re above six, your options are to increase your income, reduce your debt, or both. A JustAnswer Business consultation can help you model different scenarios if you’re self-employed or have complex income.
Document every family financial arrangement
If a parent, relative, or friend is helping with your deposit or loan, get it in writing. A deed of gift (no repayment required) or a loan agreement (with repayment terms) should be drafted by a solicitor. The cost is minimal compared to the potential dispute. The Money.com.au survey found that Gen Z buyers are most likely to receive family help — 76% did — but only 36% had a written agreement. That’s a lot of risk sitting on verbal promises.
Understand your loan structure before signing
The survey found that redraw facilities and offset accounts were the next biggest blind spots after LVR, each at 17%. An offset account is a transaction account linked to your home loan; the balance reduces the amount you pay interest on. A redraw facility lets you access extra repayments you’ve made. Both can save thousands in interest, but they work differently. An offset account is generally more flexible and doesn’t require lender approval to access funds. A redraw facility may have minimum balance requirements or fees. Ask your lender to explain which one you’re getting and how it works in practice.
Plan for the ageing investor reality
The RBA notes that more than a quarter of investors are now over 60. That matters because older investors may be more reliant on rental income and less able to return to work if things go wrong. If you’re over 50 and considering an investment property, stress-test your finances against a scenario where the property is vacant for six months and interest rates rise by 2%. If that scenario leaves you struggling, the investment may be too risky for your stage of life.
Frequently Asked Questions
What happens if my debt-to-income ratio is above six? ▾
Can I avoid Lender’s Mortgage Insurance? ▾
Is negative gearing risky? ▾
What’s the difference between an offset account and a redraw facility? ▾
Should I invest in property in a different state? ▾
What is the capital gains tax discount and why does it matter? ▾
What This Means for Your Next Property Decision
The RBA’s data shows that most Australian households and businesses are well placed to handle higher interest payments, but the risk of a more material adverse global shock has increased. That’s not a prediction — it’s a warning to build buffers while you can. The investors who come through a downturn best are the ones who knew their DTI, documented their family arrangements, and didn’t bet everything on one state’s market. If you’re carrying debt above six times your income, now is the time to reduce it, not add to it.
Remember: this article is general information only. For advice on your specific situation, speak to a qualified professional.
If this was useful, you might also want to read The Hidden Costs of Home Ownership: Are You Truly Ready?.
Sources and Further Reading
Home Loan Hacks Aussies Swear By (And Why They Work) — Practical strategies for managing your home loan that go beyond the basics.
Understanding House and Land Contract Risks When Buying in Australia — A closer look at the specific risks in off-the-plan and house-and-land purchases.
Reserve Bank of Australia (2026). Insights From New Data on Australian Housing Investors. 🔗
Money.com.au (2025). Bank of Mum and Dad: 64% of family-funded home purchases have no formal agreement. 🔗
The Australia Institute (2025). Housing Research. 🔗
Reserve Bank of Australia (2026). Financial Stability Review – March 2026: Resilience of Australian Households and Businesses. 🔗
