Why a 6% home loan can be tested at 9%

6 days ago
2 min read

BV Finance graphic explaining why a 6% Australian home loan can be assessed at 9% under a serviceability buffer

The RBA held the cash rate target at 4.35% on 11 August 2026. That cash rate is not a borrower's home-loan rate, and the rate shown on a product is not necessarily the rate a lender uses to test a new application.

Under APRA's current APS 220 standard, an APRA-regulated authorised deposit-taking institution must assess residential mortgage serviceability using a buffer of at least 3 percentage points above the interest rate payable on the loan. Limited introductory discounts are ignored for this purpose.

What the 3-point buffer means

It is a repayment-capacity test — not the interest rate charged to the borrower and not a forecast that rates will rise to that level.

It is a minimum prudential setting — individual lenders can apply their own credit policies, expense assumptions and other adjustments when assessing an application.

It does not create an approval entitlement — income, living expenses, credit limits, other debts, loan structure and the lender's criteria still matter.

Worked repayment example

Australian borrower comparing approximate repayments on a $600,000 home loan at 6% and a 9% assessment rate

Assume a $600,000 principal-and-interest loan over 30 years. At 6.00%, the repayment is about $3,597 a month. At a 9.00% assessment rate, the equivalent repayment is about $4,828 a month—a difference of roughly $1,230.

This calculation is illustrative and excludes fees. It is not a product quote, lender assessment, borrowing limit or approval estimate.

Three terms to keep separate

BV Finance guide to serviceability buffer, assessment rate and comfortable repayment for Australian home buyers

Serviceability Buffer — the safety margin added above the loan rate for a lender's repayment-capacity test.

Assessment Rate — the test rate used in the serviceability calculation; it is not necessarily the rate you pay.

Comfortable Repayment — the amount your household can sustain over time, which may be lower than the lender's maximum assessment result.

How to use this before applying

1. Stress-test the budget — run the repayment at least 3 percentage points above the product rate as a starting point.

2. Include the full household position — credit-card limits, personal loans, living costs and other commitments can affect serviceability.

3. Set your own ceiling — keep the lender's possible maximum separate from a repayment you can carry comfortably.

Bottom line

A 6% loan being tested at 9% does not mean the borrower pays 9%. It means the application is being checked against a higher repayment scenario. Stress-test before setting the property budget—not after making the offer.

Sources

Reserve Bank of Australia — Monetary Policy Decision, 11 August 2026

Australian Prudential Regulation Authority — APS 220 Credit Risk Management

Australian Prudential Regulation Authority — APG 223 Residential Mortgage Lending

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