APRA Serviceability Buffer and Mortgage Prisoners in Australia: A 2026 Mortgage Broker Guide

Since October 2021, the Australian Prudential Regulation Authority (APRA) has required all regulated lenders to assess new home loan applications using a serviceability buffer of at least 3 percentage points above the actual loan rate. While this buffer was designed to protect borrowers and the financial system from the risk of rising interest rates, it has had an unintended consequence: a growing cohort of Australians who are trapped in their existing home loans and unable to refinance, even when doing so would reduce their repayments.

These borrowers are commonly referred to as "mortgage prisoners." As of late 2026, with the APRA buffer remaining unchanged at 3 percentage points, understanding how the buffer works — and how a mortgage broker can help you navigate it — is essential for any Australian homeowner looking to improve their financial position.

How the APRA Serviceability Buffer Works

The APRA serviceability buffer is a stress test applied to all new home loan applications at regulated lenders, including banks, credit unions, and building societies. When you apply for a home loan or seek to refinance, the lender must assess whether you could afford repayments at an interest rate that is at least 3 percentage points higher than the actual rate on the loan.

For example, if you are applying for a loan at an interest rate of 6.5%, the lender must assess your ability to repay at 9.5%. This significantly reduces the maximum loan amount a borrower can qualify for — typically by 25% to 30% compared to a scenario without the buffer.

APRA has reviewed the buffer multiple times throughout 2025 and 2026, ultimately deciding to maintain it at 3 percentage points. The regulator has cited high household debt levels — which remain near 180% of disposable income — as justification for keeping the buffer in place to guard against systemic financial risk.

Who Are Mortgage Prisoners?

A mortgage prisoner is a borrower who is unable to refinance their existing home loan to a lower rate, even though they have been meeting their current repayments without difficulty. The problem arises because refinancing is treated as a new loan application, meaning the borrower must pass the serviceability test at the new lender's rate plus the 3% buffer.

If interest rates have risen significantly since the borrower originally took out their loan, the buffer applied to a new loan may result in a higher assessed rate than the borrower can demonstrate they can afford — even if their actual repayments would be lower after refinancing.

This situation is particularly acute for borrowers who took out large loans during the low-rate environment of 2020 and 2021, when variable rates were below 2%. Many of these borrowers are now paying rates above 6%, and while they have continued to meet their repayments, they cannot pass the serviceability test required to switch to a more competitive lender.

Key Considerations for Borrowers Seeking to Refinance

If you believe you may be a mortgage prisoner, or if you are simply looking to refinance in the current environment, there are several important factors to consider.

• Like-for-like refinancing exceptions — Some lenders offer discretionary exceptions for borrowers who are refinancing a similar loan amount with a clean repayment history. In these cases, the lender may apply a reduced buffer of around 1 percentage point rather than the standard 3%. This is not a universal policy and is at the lender's discretion.
• Non-bank lenders — Non-bank lenders, such as non-authorised deposit-taking institutions (non-ADIs), are not subject to APRA's serviceability buffer requirements. Some non-bank lenders apply their own, potentially lower, assessment rates. However, their products may carry different features, fees, and risks.
• Reducing existing debts — Credit card limits are assessed by lenders based on the limit itself, not the outstanding balance, typically at a monthly commitment rate of 3% to 3.8% of the limit. Closing unused credit cards or reducing limits can meaningfully improve your assessed borrowing capacity.
• Income documentation — Lenders assess income differently. A mortgage broker can identify lenders who are more favourable to your income type, whether you are a PAYG employee, self-employed, or earning variable income such as bonuses or commissions.
• Household Expenditure Measure (HEM) — Lenders compare your declared living expenses against the HEM benchmark. If your declared expenses are above the benchmark, reducing genuine discretionary spending may improve your assessed capacity.

Common Mistakes When Trying to Refinance

Borrowers who attempt to refinance without professional guidance often make mistakes that reduce their chances of approval or result in a worse outcome than their current loan.

• Applying to multiple lenders simultaneously — Each credit application leaves a mark on your credit file. Multiple applications in a short period can signal financial distress to lenders and reduce your credit score, making approval less likely.
• Focusing only on the interest rate — The headline interest rate is important, but fees, offset account features, redraw facilities, and loan flexibility can significantly affect the total cost of a loan over its life.
• Not considering the full cost of switching — Refinancing involves discharge fees, application fees, and potentially lenders mortgage insurance (LMI) if your loan-to-value ratio (LVR) has increased. A broker can help you calculate whether the savings from a lower rate outweigh the costs of switching.
• Ignoring the impact of a fixed rate expiry — Borrowers whose fixed rate periods are expiring face a "reversion cliff," where their rate reverts to a potentially much higher variable rate. Planning ahead with a broker before the fixed period ends is essential.
• Assuming your current lender will offer the best deal — Existing lenders often reserve their most competitive rates for new customers. A broker can negotiate on your behalf or identify a better deal elsewhere.

Australian Regulatory Context

The APRA serviceability buffer is set under APRA's prudential standard APS 220 (Credit Risk Management) and the associated guidance in APG 223 (Residential Mortgage Lending). APRA has the power to adjust the buffer in response to changing economic conditions, and it has done so in the past — reducing the buffer from 7% to 5% in 2019 and then increasing it to the current 3 percentage points above the loan rate in 2021.

Mortgage brokers in Australia are regulated by ASIC and are subject to a best interests duty under the National Consumer Credit Protection Act 2009 (Cth). This duty requires brokers to act in the best interests of the borrower when recommending a home loan, and to prioritise the borrower's interests over their own. Brokers must also comply with responsible lending obligations, which require them to make reasonable inquiries about a borrower's financial situation and verify that a loan is not unsuitable.

The Australian Financial Complaints Authority (AFCA) provides a free dispute resolution service for borrowers who have a complaint about a mortgage broker or lender. If you believe a broker has not acted in your best interests, or that a lender has applied the serviceability buffer incorrectly, AFCA can investigate and, where appropriate, require remediation.

Questions to Ask Your Mortgage Broker

If you are considering refinancing or believe you may be a mortgage prisoner, the following questions can help you get the most from a conversation with a mortgage broker.

• Am I likely to pass the serviceability test at a new lender, given my current income and expenses?
• Are there lenders who offer like-for-like refinancing exceptions that might apply to my situation?
• Would a non-bank lender be a suitable option for me, and what are the risks?
• What steps can I take to improve my assessed borrowing capacity before applying?
• What are the total costs of refinancing, including fees and any LMI?
• How does my current loan compare to the best available options in the market?
• If I cannot refinance now, what should I do to improve my position over the next 12 months?

How MyMoney® Can Help

Navigating the APRA serviceability buffer and the mortgage prisoner problem requires specialist knowledge of the lending market and the regulatory framework. A qualified mortgage broker can assess your specific situation, identify lenders who are most likely to approve your application, and guide you through the refinancing process from start to finish.

Brokers have access to a wide panel of lenders — including banks, credit unions, and non-bank lenders — and can compare hundreds of loan products to find the best fit for your circumstances. Their obligation to act in your best interests means you receive advice that is genuinely tailored to your needs.

Post a Brief on MyMoney® to connect with experienced mortgage brokers who understand the APRA buffer and can help you explore your refinancing options. You can also Browse Mortgage Brokers on our marketplace to find a professional who can help you break free from your current loan.