Key takeaways
Mortgage prison describes difficulty refinancing, including when equity or borrowing power is limited.
Negative equity occurs when your outstanding home loan balance exceeds your property's current value.
A fixed rate offers certainty, but switching before the fixed term ends may involve break costs.
Review your loan rate, equity and repayments before deciding whether to negotiate or refinance.
Interest rate changes can affect more than your monthly repayments. Your ability to refinance also depends on your financial position and property value, while a fixed-rate loan can limit your flexibility to switch.
Understanding these risks can help you prepare for a home loan review, whether rates are rising, falling or holding steady.
We’ll explain what mortgage prison, negative equity and fixed-rate restrictions mean, then look at practical questions to explore with your lender or Aussie Broker.
1. What is mortgage prison?
“Mortgage prison” describes being unable to refinance to another loan, even when you want to switch. Limited equity or difficulty meeting a new lender’s repayment assessment can reduce your options.
Equity is your property’s value minus the amount owing on your home loan. If the value falls while your balance stays similar, your equity shrinks.
A new lender also assesses whether you can afford the proposed loan, considering income, expenses and existing debts.
Refinancing with less than 20% equity may involve lenders mortgage insurance (LMI). LMI protects the lender if you default, rather than protecting you. Requirements and exemptions depend on the loan and lender.
Why doesn’t making my repayments guarantee refinance approval?
Making your current repayments and qualifying for a new loan are different assessments.
APRA’s guidance says banks should consider repayment capacity under stress, including potential increases in interest rates or expenses and reductions in income.
That helps explain why a borrower who manages their existing repayments may still have difficulty qualifying for a replacement loan.
The new lender applies its assessment criteria, rather than looking only at whether the advertised repayment is lower.
Tom Gallagher, an Aussie Broker at Aussie The Junction in NSW, says refinancing hurdles can develop after the original purchase.
“One issue I see is customers taking on new consumer debt after buying their home," he said.
That is another reason to review your current income, expenses, and debts before assuming you’ll qualify for a replacement loan.
Explore how refinancing works when property values fall before assuming switching is off the table.
2. What is negative equity?
Negative equity occurs when your outstanding home loan exceeds your property’s current value. Recent buyers and borrowers with higher loan-to-value ratios have less equity to absorb a price fall.
For an illustrative example:
Position | Property value | Loan balance | Equity |
|---|---|---|---|
Before the value falls | $800,000 | $720,000 | $80,000 |
After the value falls | $700,000 | $720,000 | −$20,000 |
The second scenario leaves the borrower owing $20,000 more than the property is worth.
Illustrative figures only. This example excludes selling costs, fees, and changes in the loan balance. It is not a property valuation or a prediction of future property values.
Negative equity can make refinancing difficult. If you sell for less than the outstanding debt, the proceeds would not cover the loan.
However, negative equity alone does not mean a borrower will default if they can continue servicing their loan.
The distinction matters: a change in property value affects equity, while difficulty meeting repayments affects cash flow. A household can face one problem without necessarily facing the other.
Market context: rates and property values in September 2026
At its 29 September 2026 meeting, the RBA increased the cash rate target by 25 basis points to 4.60%. Its decision cited elevated inflation, higher energy prices, and pressure on domestic capacity.
Annual CPI inflation was 4.0% in August 2026, with trimmed mean inflation at 3.6%.
At the end of September, Cotality reported national dwelling values 5.2% below their March 2026 peak. Sydney was 8.6% below its February peak; Melbourne was 7.2% below its November 2025 high.
The downturn varied across markets. Brisbane recorded September’s largest capital-city monthly fall at 1.5%, while Darwin rose 0.4%. A market average cannot establish an individual home’s value or its owner’s equity position.
Follow our Interest Rate Tracker for the latest cash rate updates and announced rate changes from lenders on Aussie’s panel. for the latest cash rate updates and announced rate changes from lenders on Aussie’s panel.
The tracker covers announced rate changes from lenders on Aussie’s panel. Your rate will depend on your lender, home loan product, and circumstances. Not all lenders are available through all brokers.
3. How can a fixed-rate loan affect your flexibility?
A fixed rate provides repayment certainty during the fixed period, but your rate stays unchanged if market rates fall.
Variable rates are set by lenders, so a cash rate cut does not automatically produce an identical home loan rate reduction.
Fixing is a trade-off between certainty and flexibility. The question is whether that balance suits your budget and plans, rather than whether you can correctly predict the next rate move.
Switching before a fixed term ends may involve a break fee. Ask your lender for a current estimate before comparing the cost with any potential benefit.
What should I check before my fixed rate expires?
Your loan may revert to a variable rate unless you arrange another option. Review the expiry date and ask your lender what rate, repayment and loan features would apply afterwards.
Amy Bester, an Aussie Broker at Aussie South Morang in Victoria, says one challenge for customers moving off a lower fixed rate is “not understanding how much of a jump their mortgage repayment is going to be”.
She says she now contacts fixed-rate customers earlier to help them understand their upcoming repayments and prepare for the change.
Give yourself time to compare staying with your lender, negotiating another product or applying elsewhere. Our fixed-rate expiry guide explains the questions to ask before the fixed period ends.
How can you minimise these risks?
Build equity where your budget allows
Reducing the loan balance can strengthen your equity position, although property values can still change.
Options to review include:
Increasing regular repayments, provided your budget and loan terms allow.
Paying half the monthly amount fortnightly. Because there are 26 fortnights in a year, this can result in the equivalent of an extra month’s repayment annually.
Making extra or lump-sum repayments, after checking restrictions and fees.
Changing repayment frequency alone may not increase the amount you repay each year. Ask your lender how it calculates fortnightly repayments before changing your schedule.
The fortnightly approach above works by paying half the monthly amount every two weeks. Ask your lender how it calculates the payment before changing your schedule.
For home improvements, assess the cost and likely valuation benefit before proceeding. Avoid assuming renovation spending will add the same amount to your equity.
Balance extra repayments with accessible savings
Before directing spare money towards your mortgage, consider upcoming bills and unexpected expenses. Paying down debt and keeping money accessible serve different purposes.
An offset account, where available, can reduce the balance charged interest while keeping savings in a linked transaction account.
The money remains in the offset account rather than directly paying down the loan principal. If your offset reduces the interest charged, more of your regular repayment may go towards reducing the amount you owe.
Extra repayments accessed through redraw work differently. Access depends on your lender’s rules, and limits, fees or delays may apply.
Compare those conditions with the costs of an offset account before deciding how to hold accessible savings.
An offset is not automatically worthwhile. Account fees or a higher loan rate may outweigh the interest benefit when the balance is low.
Ask your lender to review your rate
Your lender may offer a lower rate to retain your business, although a reduction is not guaranteed.
Compare similar products to check for a home loan loyalty tax: the term describes existing customers paying more than comparable new-customer offers. Consider fees and features alongside the headline rate.
Compare refinancing costs and benefits
Include break fees, discharge fees, application costs and any LMI. Also compare the remaining term with the proposed replacement term. Extending the loan can increase total interest, even if the monthly repayment falls.
Tom says a loan review should consider more than the immediate repayment: “One of the biggest mistakes is focusing on the monthly repayment or interest rate without considering the loan term and bigger picture goals."
For an illustrative comparison, refinancing a loan with 22 years remaining into another 30-year loan adds eight years to the repayment period. Ask for comparisons using both terms so you can understand the trade-off.
Illustrative example only. Actual repayments and total interest depend on the loan balance, interest rate, term, fees, and repayment arrangements.
Use our Interest Rate Change Calculator to explore repayment changes, or our Mortgage Repayments Calculator to compare scenarios.
Calculator results are estimates only, not an offer of credit or loan approval. Actual costs depend on the loan’s rate, term, fees and features.
What should you bring to a home loan review?
Prepare a short list so the conversation focuses on your position:
Your current rate, loan balance and remaining term.
Your minimum repayment and any fixed-rate expiry date.
Recent income details, household expenses, and other debts.
Any offset or redraw balances and their access conditions.
Your plans, such as moving, renovating or changing working hours.
Ask your lender or Aussie Broker to explain your equity position, potential switching costs and how your plans could affect the options available.
A review can help you understand the choices without committing you to refinance.
You don’t need to review your home loan alone. Book a free^ chat with an Aussie Broker to discuss your current loan, switching costs and available options.
