Debt-to-Income Ratio in Australia: What It Means for Your Home Loan

If you have been following news about the property market in early 2026, you have likely heard about debt-to-income ratios. On 1 February 2026, APRA's new debt-to-income lending cap came into effect, reshaping how banks assess borrowers, particularly investors and high-income buyers in expensive markets. Understanding what a DTI ratio is, how lenders use it and what the new rules mean for your borrowing is now essential reading for anyone planning to buy property.

What Is a Debt-to-Income Ratio?

A debt-to-income (DTI) ratio compares your total debt to your gross annual income. It is expressed as a multiple.

The formula is straightforward:

Total debt divided by gross annual income equals your DTI ratio.

If you earn $120,000 per year and your total outstanding debts, including the new home loan you are applying for, add up to $720,000, your DTI is six.

Total debt for this calculation typically includes your proposed home loan balance, any existing home loans, investment property loans, car loans, personal loans and HECS/HELP balances. It does not usually include credit card balances unless the card is near its limit, though lenders treat credit card limits differently.

Why Do Lenders Use DTI?

Lenders use the DTI ratio as a measure of financial risk. A borrower with a DTI of four carries less risk than one with a DTI of eight, because their debt burden is smaller relative to the income available to service it.

Australian banks have been factoring DTI into lending decisions informally for years. What changed in 2026 is that APRA formalised restrictions around high-DTI lending at a system level.

APRA's 2026 DTI Lending Cap: What Changed?

APRA's macro-prudential intervention means that from February 2026, no more than 20 per cent of a bank's new home loan approvals in any given quarter can go to borrowers with a DTI of six or more.

This does not ban borrowing at DTI levels above six. It means lenders must be selective about which applications in that range they approve. In practice, this creates a more competitive environment for applications that push or exceed a DTI of six. Lenders will typically prioritise borrowers with the cleanest financial profiles, most stable incomes and strongest applications in this bracket.

For borrowers well below a DTI of six, the change has limited practical impact on day-to-day approvals.

What Is Considered a High DTI Ratio?

As a general guide across Australian lenders:

A DTI below four is considered low risk and typically presents no assessment difficulty.

A DTI between four and six is moderate. Most lenders will still approve these applications comfortably with a strong overall financial profile.

A DTI above six is elevated. Under the new APRA cap, this group faces greater scrutiny and some lenders may be more selective, particularly toward the end of a quarter when they are managing their cap.

A DTI above eight is typically where most standard lenders become unwilling to approve, regardless of the APRA cap.

How to Calculate Your DTI

Start with your gross annual income. If you are employed, this is your base salary before tax. Overtime, commission and rental income can be included but are treated conservatively by most lenders.

Add up all your current debts:

Your existing home loan or investment loan balances (not the repayments, the actual outstanding amounts).

Personal loans and car finance outstanding balances.

HECS/HELP balance.

75 per cent of credit card limits (this is how most lenders treat credit cards under APRA guidelines, regardless of current balance).

Then add the loan amount you are applying for.

Divide the total debt by your gross annual income.

Strategies for Managing Your DTI

If your DTI is approaching or above six, there are several approaches that can improve your position before applying.

Pay down existing debts. Reducing a car loan or personal loan directly reduces your total debt figure and your DTI. Even partial paydown can make a meaningful difference.

Close unused credit cards. Even an unused credit card with a $10,000 limit adds $7,500 to your assessed debt (75 per cent of the limit). Cancelling cards you do not use can reduce your calculated DTI.

Increase your income. A documented salary increase, a new role or a provable additional income stream can move your DTI from above to below the threshold.

Reduce the loan amount. Buying a less expensive property, using a larger deposit, or having a co-borrower with income and no debts can all bring the DTI into acceptable territory.

Use gifted funds or consider a co-borrower. Adding a co-borrower adds their income to the denominator of the DTI calculation, which can materially reduce the ratio, provided they do not also bring significant additional debt.

DTI vs Borrowing Capacity: They Are Related but Different

Borrowing capacity (sometimes called serviceability) is the traditional measure of how much you can borrow based on whether you can meet the repayments after applying the mandatory APRA buffer rate (which requires lenders to assess you at three per cent above the loan rate). DTI adds a separate constraint that limits borrowing based on total indebtedness relative to income, regardless of cash flow.

It is possible to pass a serviceability test but fail a DTI assessment. In a high-rate environment, both constraints are in play simultaneously.

How Does DTI Affect Investors?

Property investors are disproportionately affected by DTI caps because they typically carry multiple loans across several properties. An investor with a portfolio of two or three properties may have a DTI that is already at or above six before adding a new loan.

Strategies that investors use to manage DTI include:

Paying down investment property loans to reduce outstanding balances.

Structuring new purchases to maximise rental income recognition (which increases gross income in the calculation).

Timing applications in a way that avoids a lender's end-of-quarter period, when DTI caps may be tightest.

Considering non-bank lenders that are not subject to APRA's DTI cap in the same way (though they typically apply their own internal DTI policies).

What Does This Mean for the Property Market?

The DTI cap effectively constrains the amount the most highly leveraged borrowers can add to their debt, which reduces the upward pressure these buyers can place on property prices. This is the policy intent: to reduce system-wide financial risk rather than target individual borrowers.

For buyers with DTI ratios comfortably below six, the change is largely invisible in practical terms.

Use the free Borrowing Capacity calculator at HomeLoanTools.com.au to get an estimate of how much you may be able to borrow based on your income and existing debts, and whether your DTI is likely to be a consideration in your application.