Mortgage Lending Guardrails Unchanged After September Review

Short answer

Australia's mortgage lending guardrails did not change after the Council of Financial Regulators reviewed housing-related financial stability risks in September 2026.

The Council said on 3 September that the Reserve Bank supported APRA's recent decision to keep the settings unchanged. The current settings include:

• a 3 percentage-point mortgage serviceability buffer; and
• limits that allow banks to write up to 20% of new owner-occupier lending and 20% of new investor lending at a debt-to-income ratio of six or more.

These are system-wide prudential settings. They do not tell an individual how much a lender will approve, and a DTI ratio of six is not an automatic personal rejection point.

What the September statement said

The Council of Financial Regulators brings together APRA, ASIC, Treasury and the RBA. It met on 2 September and released its quarterly statement the following day.

For housing and mortgage lending, the Council reported that:

• tighter financial conditions had contributed to declines in housing prices and weaker housing-market sentiment;
• indications of stress among borrowers remained limited;
• most households appeared resilient to a range of adverse economic outcomes; and
• DTI limits and serviceability buffers remained important guardrails against a build-up of vulnerabilities.

Those observations describe the financial system in aggregate. They do not mean every household is financially comfortable or that a particular borrower will pass a lender's assessment.

Current mortgage guardrails

APRA confirmed these settings on 28 May 2026. The September Council statement supported that decision but did not announce a new percentage, threshold or implementation date.

No RealEstateCalc formula changed because of the September statement.

How the serviceability buffer works

The serviceability buffer is a minimum prudential setting for APRA-regulated lenders. It helps banks test whether a new borrower could continue to meet repayments if rates or expenses were higher than at application.

For a simple illustration, a loan with an actual rate of 6.20% plus the 3 percentage-point buffer gives 9.20%.

That does not prove the lender will use 9.20% as the final assessment rate. A lender can apply a higher floor or other policy, and its calculation can also include verified income, living-expense assumptions, credit limits, existing debts, proposed loan terms and minimum-surplus rules.

Use the Borrowing Power Calculator to test a labelled scenario, not to predict approval. The result is an estimate based on the inputs and simplified assumptions entered.

How the DTI limits work

Debt-to-income ratio compares total known debt with gross annual income.

DTI = total debt divided by gross annual income

Suppose an applicant has $800,000 of total debt and $120,000 of gross annual income:

$800,000 divided by $120,000 = 6.67

That is above six, but the result is not an automatic approval or rejection. APRA's 20% limits apply to the share of a bank's new lending in specified reporting categories. A lender still makes its own credit decision and may use policies that are more conservative than the prudential limit.

APRA said preliminary March-quarter data showed high-DTI lending was well below the limits, so the limits were not restricting overall bank lending at that time. It kept them as guardrails because higher-risk lending had been increasing and the outlook was uncertain.

Use the Debt-to-Income Ratio Calculator to check the arithmetic and see which debts are included in the site's estimate. Do not treat the result as a lender decision.

What this means for a home buyer or investor

The practical message is continuity, not easier or tighter approval rules.

An applicant should still expect a lender to look beyond the advertised mortgage rate. Useful checks before applying include:

1. Record gross income using documents the lender is likely to accept.
2. List existing loan balances, credit card limits and other debts.
3. Use current living expenses rather than a desired future budget.
4. Test the proposed loan at a higher rate.
5. Leave room for fees, insurance, rates and other ownership costs.
6. Ask the lender or broker which assessment assumptions apply to the application.

The Mortgage Stress Test can compare repayment scenarios at higher rates. The Mortgage Repayment Calculator estimates contractual repayments at an entered retail rate. Neither reproduces a lender's full serviceability model.

Mortgage buffer is a different concept

APRA's serviceability buffer is used in lender assessment. A household mortgage buffer is accessible cash, offset savings or confirmed redraw that may help cover payments during an income or expense shock.

The two ideas should not be combined. Read How to Calculate a Mortgage Buffer for a separate household cash-cover worksheet.

What remains uncertain

APRA reviews macroprudential settings as risks change, so the current settings are not permanent promises. Lender policies can also change without a change to the APRA minimum.

The Council's view that borrower stress remained limited is an aggregate assessment. Individual arrears, hardship, employment, insurance and household-cost circumstances can be very different.

If repayments may be missed, contact the lender early and consider free financial counselling. A calculator cannot assess hardship or replace a lender's assistance process.

Sources

• Council of Financial Regulators: Quarterly Statement, September 2026, released 3 September 2026 and checked 4 September 2026.
• APRA: Macroprudential policy settings remain unchanged, released 28 May 2026 and checked 4 September 2026.

General information disclaimer

This article provides general information only. It is not financial advice, credit advice, a lender assessment, an approval, a borrowing limit or a recommendation to apply for a loan or buy property. Lender policy, accepted income, expenses, debts, interest rates and assessment methods vary. Check the current terms with the lender or an appropriately licensed credit professional.

Last updated: 4 September 2026.