Rental income is not the only number in an investment loan

Rental income is one input in an Australian investment-loan application. A lender also adds up existing mortgages, the proposed investment loan and other debts, then compares that total with the annual income it accepts. Rent can support the application, but it does not make the borrower's existing debts disappear.

The Australian Prudential Regulation Authority (APRA) is the government regulator responsible for the safety and stability of banks and other regulated deposit-taking institutions. From 1 February 2026, each regulated lender may fund no more than 20% of new investor loans at a debt-to-income ratio of six or more. This is a limit on the lender's overall investor-loan book, not an automatic personal rejection when a calculation reaches six.

What a simple debt-to-income check shows

Total debt — include existing mortgages, the proposed loan and other debts relevant to the lender's assessment.

Accepted annual income — the income the lender accepts under its policy, which may not equal every dollar shown on a tax return or rental estimate.

Simple DTI — divide total debt by accepted annual income to see the number of times debt exceeds income.

Illustrative example

Assume the lender accepts $120,000 of annual income. An existing $300,000 mortgage plus a proposed $420,000 investment loan gives $720,000 of total debt. The simplified DTI is $720,000 divided by $120,000, or six. This does not determine approval by itself.

What the lender still checks

Rental-income treatment — the lender may use only the amount supported by its policy and evidence.

Living and property costs — household spending, rates, insurance, management, maintenance and vacancy still affect cash flow.

Serviceability — the lender tests whether accepted income can cover expenses and stressed loan repayments.

Lender policy — different lenders can apply different evidence, income and risk settings within the regulatory limit.

Current system-level context

APRA reported that 10.8% of new investor loans funded by regulated institutions in the March quarter 2026 had DTI of six or more, up from 8.2% a year earlier. This is an industry statistic, not a prediction of any applicant's result.

What to do before applying

List every current debt and proposed loan, then ask how the lender will treat rent and other income. Test the property cash flow separately, because a loan can meet one ratio and still fail the lender's full affordability assessment.

Sources

Australian Prudential Regulation Authority — Activation of debt-to-income limits

Australian Prudential Regulation Authority — Quarterly ADI statistics, March 2026

Australian Bureau of Statistics — Lending indicators, June Quarter 2026

General information only. This is not financial advice. Loan options and eligibility depend on your personal income, liabilities, assets and lender assessment criteria.