• Mortgage prison is when you cannot refinance your home loan, even though doing so could save you money, because you fail to meet a new lender's requirements.
• There are three types of mortgage prison in Australia: serviceability prison, equity prison, and credit prison. Many borrowers are trapped by more than one at once.
• The 3% serviceability buffer, which APRA confirmed it will keep in place as of July 2025, is the most common cause of mortgage prison for Australian borrowers right now.
• Several legitimate escape routes exist, including same-lender refinancing, APRA's "non-material increase" exemption, and non-bank lenders who are not bound by APRA's buffer rules.
• You can check whether you are currently trapped using the three tests in this article before speaking to a broker.

This is by far the most common type in Australia right now.

When you apply to refinance, any new lender must assess whether you can afford the loan. Under APRA rules, they test whether you can afford repayments at your actual interest rate plus 3 percentage points. This is the serviceability buffer.

The problem: if you originally borrowed when rates were at historic lows (2020 to 2022), you likely passed the stress test easily. But when you try to refinance today, with actual variable rates sitting around 6.0 to 6.5%, the stress test is run at 9.0 to 9.5%. That is a dramatically higher hurdle, and many borrowers who can comfortably afford their current repayments cannot pass it for a new loan.

The cruel irony: you may be paying your mortgage without missing a single repayment, but a new lender will still reject you because you cannot theoretically afford a rate 3% higher than what they would actually charge you.

As of May 2026, with the RBA cash rate at 4.35% and APRA confirming in July 2025 that the 3% buffer stays unchanged, this remains the primary barrier for hundreds of thousands of Australian borrowers.

This type occurs when your property's value has fallen since you borrowed, leaving you with less than 20% equity in your home.

When you refinance to a new lender, they conduct a fresh property valuation. If your property is now worth less than when you bought it, or if your loan balance has not reduced much because you have been on interest-only repayments, your loan-to-value ratio (LVR) may be above 80%.

At above 80% LVR, the new lender will require you to pay Lenders Mortgage Insurance (LMI). Depending on the loan size, LMI can cost $8,000 to $20,000 or more, which often cancels out any interest savings from switching. In extreme cases where LVR exceeds 90 to 95%, some lenders will refuse the application outright.

This type of mortgage prison was widespread between late 2022 and mid-2024, when Australian property prices fell in many markets. It is less common now as values have broadly recovered, but it still affects borrowers in regional areas and high-density apartment markets where values have been slower to rebound.

The third type occurs when your credit profile has deteriorated since you took out your original loan.

A credit score that was excellent when you first applied may have slipped due to missed payments, a credit card default, a buy-now-pay-later account reported as overdue, or simply having applied for too much credit in a short period. A credit enquiry from a failed loan application can itself lower your score.

Lenders reserve their best refinancing rates for borrowers with clean credit records. If your score has dropped, you may find that any new lender prepared to take you on charges a rate that is no better than what you already have, making the exercise pointless.

The numbers are significant. At the peak of the rate-hiking cycle in 2023, Roy Morgan data found that over 1.5 million mortgage holders (30% of all borrowers) were at risk of mortgage stress. NAB publicly estimated that 15 to 20% of their own book were caught in a mortgage trap.

Compare Club data from early 2023 found that the number of Australians at risk of mortgage prison had jumped 42% since the RBA started raising rates, with around 700,000 borrowers in an LVR trap alone. NSW had the highest concentration, with 19% of refinancing enquiries coming from borrowers with an LVR above 91%.

While the rate environment has shifted since then (the RBA delivered rate cuts through 2025 before hiking rates three times in early 2026), APRA's buffer has not moved. Borrowers who were locked in at low fixed rates and have since rolled onto variable rates continue to face the same serviceability wall when they attempt to switch lenders.

You do not need a broker to do an initial check. Work through these three questions:

Question 1: The serviceability test. Take your current variable rate and add 3%. Can you demonstrate to a lender that your household income, after all expenses, would cover repayments at that higher rate? If not, you are in serviceability prison.

For a rough check: on a $600,000 loan at a 6.25% actual rate, repayments are approximately $3,690 per month. The stress test runs at 9.25%, which pushes repayments to approximately $4,940 per month. That extra $1,250 per month must be covered by your income surplus after declared living expenses.

Question 2: The equity test. What is your property approximately worth today? Divide your remaining loan balance by that value. If the result is above 0.80 (80%), you have less than 20% equity. If it is above 0.90 (90%), refinancing with a new lender is likely to trigger LMI costs, making switching uneconomical.

Question 3: The credit test. Have you missed any repayments in the past two years, taken on significant new debt, or had any accounts sent to collections? If yes, pull a free copy of your credit report from Equifax, Experian, or illion (all three offer free reports) and check your score before you apply anywhere. A rejected application creates another credit enquiry, which further damages your score.

If you answered "yes" to any of these, keep reading. There are ways out of each type.

The most overlooked option. When you refinance with the same lender by switching to a different product on their menu, APRA's serviceability buffer does not apply in the same way. Your lender can assess your ability to service the new loan based on your actual repayment history rather than running a full stress test.

This means you may be able to negotiate a meaningfully lower rate with your existing lender without needing to pass a 9%+ stress test. The downside is that your lender knows it has you captive and may not offer its sharpest rate. Come prepared with competitor rates and be willing to push back.

APRA's rules include a provision known as the non-material increase exemption. Under this provision, a new lender can waive the standard serviceability buffer assessment if the refinance does not materially increase the borrower's total debt.

In practice, this typically means the new loan cannot exceed the existing loan balance by more than a small amount (one major bank set this at $50,000 at the time of writing). The borrower must also declare that their financial situation has not materially changed.

This exemption has allowed some mortgage prisoners to cross to a new lender and access a better rate without needing to clear the full 9%+ hurdle. Not all lenders offer this, and the conditions vary. Ask your broker specifically whether any lender on their panel has a policy covering this exemption.

Non-bank lenders (lenders who are not authorised deposit-taking institutions, or ADIs) are not subject to APRA's serviceability buffer rules. They set their own assessment criteria, which are often less conservative.

This does not mean non-bank lenders are reckless. They still assess your ability to repay. But their stress test may be run at a lower rate than 3% above the actual rate, or they may rely more heavily on your actual financial history than on a hypothetical scenario.

Non-bank lenders generally charge slightly higher rates than major banks, but if the alternative is staying with a lender charging a revert rate that is 0.5 to 1.0% above the market, the calculation can still work in your favour. Run the numbers carefully with a broker before committing.

If your LVR is close to 80%, a relatively modest lump sum payment may be enough to push you below that threshold and unlock refinancing. For example, on a $700,000 property with a $580,000 loan (83% LVR), paying down $21,000 reduces your loan to $559,000 and gets you to 79.9% LVR.

At an LVR under 80%, you avoid LMI entirely and gain access to the full market. If you have funds sitting in an offset account, a redraw facility, or a savings account earning less than your mortgage rate, this is worth considering.

Bheja.ai's lump-sum repayment calculator shows you how much a single payment reduces your LVR and how that affects your refinancing options.

If your property value has recovered and you have been making principal and interest repayments, your LVR may already be improving. Pull a property estimate through CoreLogic, Domain, or your broker before assuming you are still trapped. Many borrowers who were in equity prison in 2023 are no longer trapped in 2026.

If credit is your barrier, time and clean repayment history are the main remedies. Default listings stay on your file for five years; late payment markers for two years. In the interim, make every payment on time, reduce your credit card limits (even on cards you do not use), and do not submit multiple loan applications in quick succession.

A good broker can run a soft credit check to assess your situation without leaving a footprint on your credit file.

The serviceability buffer has become one of the most debated housing policy questions in Australia.

The argument for keeping the 3% buffer is that it protected Australian borrowers from catastrophic defaults when rates rose sharply from 2022 to 2023. Without the buffer, lenders would have approved loans that millions of borrowers could not service once rates normalised.

The argument against: with the RBA cash rate already elevated, testing borrowers at a rate 3 percentage points above current levels means stress-testing at over 9%. This is, critics argue, an extreme test that locks creditworthy borrowers out of the market and prevents them from accessing competition that would save them thousands per year.

The Housing Industry Association, the Property Council of Australia, and many mortgage industry bodies have called for the buffer to be reduced to 1-2%. APRA reviewed the buffer in July 2025 and confirmed it would remain unchanged. The buffer is also being supplemented by the new DTI cap, effective from February 2026, which limits new lending with a debt-to-income ratio above 6x to 20% of a lender's portfolio.

The debate is ongoing. For borrowers, the practical reality is that the buffer remains at 3% and that dealing with it requires working within the system as it stands.

Bheja.ai works with over 100 lenders, including non-bank lenders who operate outside APRA's serviceability framework. If you think you may be in mortgage prison, the first step is a free home loan health check, which assesses your current rate against the market, checks your approximate LVR, and identifies which lenders on our panel have refinancing policies that may apply to your situation.

Our AI assistant can also run through your numbers with you before you speak to a broker, so you come to that conversation knowing exactly where you stand.

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This article provides general information only. It does not constitute financial advice. Bheja Group Pty Ltd (ABN 31683827938) is a Corporate Credit Representative (CR 570637) of Purple Circle Financial Services Pty Ltd (ACL 486112). Always seek independent financial advice before making borrowing decisions.