Debt to Income Ratio Australia: How DTI Affects Your Borrowing Power
When you apply for a home loan or investment loan in Australia, the bank checks your debt-to-income ratio. Most people have never heard of it, but it has a big say in how much you can borrow, and the rules became stricter on 1 February 2026.
This guide explains what it is and what you can do to put yourself in a stronger spot before you apply.
What Is a Debt-to-Income Ratio?
Your debt-to-income ratio, or DTI, is just one number. It shows how much you owe compared to how much you earn in a year before tax. Here is the simple sum:
Total Debt ÷ Gross Yearly Income = DTI
If you earn $120,000 a year and you owe $600,000 in total. Your DTI is 5. In plain terms, you owe five times what you earn in a year. Banks see a DTI of 5 as okay, but not low.
A Simple Example
Earn $120,000 and owe $600,000, and your DTI is 5. The number climbs whenever your debt grows faster than your pay.
Source: Example based on standard Australian lender DTI methodology, 2026.
Why Lenders Care About It
A bank wants to know more than whether you can pay this month. It wants to know how safe you are if life changes. A high DTI means a big part of your income is already going to debt. If rates go up or your income drops, you have very little room to cope.
The Reserve Bank has warned for years that people who owe a lot compared with what they earn are more likely to fall behind. The DTI gives banks a quick, fair way to see how stretched you are.
The New APRA Limit Explained
APRA is the body that watches over Australian banks. From 1 February 2026, it set a new rule. Banks can give no more than 20% of their new home loans to people with a DTI of 6 or higher. The rule is counted separately for people buying a home to live in and for investors.
APRA brought this in because high-DTI lending was creeping up again, mostly from investors. When the rule started, about 7.3% of new loans were high-DTI, up from a low of 5.0% in mid-2024. Back in 2021, when rates were very low, it had reached 27.4%.
How Many New Loans Sit Above the 6 Threshold
In 2021, more than a quarter of new loans were high-DTI, far above the new 20% limit. APRA's rule is there to stop that kind of jump from happening again.
Source: APRA Quarterly ADI Property Exposure Statistics (December 2025); APRA paper, November 2025. Some quarters estimated.
Where New Borrowers Land on the DTI Scale
Almost half of borrowers sit in the 4 to 6 band, just under the line. A small jump in debt can push them into the harder 6-plus group.
Source: APRA Quarterly ADI Property Exposure Statistics; lender credit policies, 2025.
High DTI: Investors vs Home Buyers
Investors are about two and a half times more likely to have a high DTI than people buying their own home. That is why APRA pointed at investors when it set the rule.
Source: APRA paper, November 2025; share of high-DTI loans by borrower type.
How an Investor's DTI Climbs (Example)
In this example, the investor is fine for the first three properties, then crosses the line at the fourth. This is where many investors get stuck without warning.
Source: Example only, not a forecast. Based on patterns in APRA and RBA reports, 2025 to 2026.
How to Lower Your DTI Before You Apply
The good news is that your DTI is not set in stone. A few simple moves can bring it down before you talk to a lender.
Pay off small debts. Clear car loans, personal loans, and credit cards where you can. Even small drops help.
Cut your credit card limits. Banks count the full limit, not just what you owe. Lowering or closing cards you do not use cuts your debt on paper right away.
Show all your income. If you get rent, side work, or extra pay, make sure your broker lists and proves it.
Give it time between buys. If you plan to buy more than one property, spacing them out lets rent count properly and helps your numbers.
Use a good broker. Not every lender treats DTI the same. Some non-bank lenders are not under the same limit and may have more room at higher DTI levels.
Frequently Asked Questions
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