Imagine paying a gym membership for four years, never missing a payment, never causing any trouble. And then finding out the gym has been signing up new members at half the price you pay, for the exact same access.
That is more or less what is happening to millions of Australian mortgage holders right now.
The gap between the interest rate your bank charges you as a loyal, existing customer and the rate it quietly offers to brand new borrowers is known as the loyalty tax. It is not a line on your statement. It is not disclosed in your loan contract. And your bank has no legal obligation to tell you about it.
But it is real; it has been formally investigated by the Australian government, and across 3.8 million Australian households, it amounts to an estimated minimum of $3 billion a year in excess interest that borrowers are paying simply for staying put.
Here is everything you need to know.
This is not a theory. The government investigated it.
In 2020, the Australian Competition and Consumer Commission ran a formal Home Loan Price Inquiry and published its findings. What they found was uncomfortable.
The ACCC confirmed that the gap between what new customers pay and what existing customers pay grows steadily the longer someone stays with the same lender. As per ACCC, Home Loan Price Inquiry Final Report, November 2020, accc.gov.au, the average difference in interest rates between new and existing variable rate customers was:
- Less than 1 year with your lender: you pay 0.29% more than a new customer
- 1 to 3 years: 0.47% more
- 3 to 5 years: 0.58% more
- 5 to 10 years: 0.71% more
- Over 10 years: 1.04% more
The regulator's conclusion was plain. "Borrowers can save thousands of dollars in the first year alone by switching lenders or products or asking for a better deal, with older loans around 58 basis points higher than the average rate for new loans."
What is it costing Australia each year?
Let us put a number on this.
According to the 2021 ABS Census, approximately 3.8 million Australian households hold a mortgage. (Source: ABS, 2021 Census of Population and Housing, abs.gov.au)
The most recent official government data on actual outstanding mortgage balances is from the ABS Survey of Income and Housing 2019-20, which recorded a national median outstanding mortgage balance of $275,000. The ABS cancelled the follow-up 2023-24 survey due to data quality concerns, and updated results are not expected until mid-2027. (Source: ABS, Housing Occupancy and Costs, 2019-20, abs.gov.au)
Using these two official figures and the ACCC's documented rate gap of 0.58% for borrowers three to five years into their loan, and applying a conservative assumption that at least half of Australia's 3.8 million mortgaged households have held their loan for three or more years (a very modest estimate given standard loan terms run 25 to 30 years), the annual cost of the loyalty tax across Australia is:
1.9 million households x $275,000 x 0.58% = approximately $3.03 billion per year
This is a floor, not a ceiling. The $275,000 median outstanding balance dates from 2019-20, before Australia's property boom pushed loan sizes dramatically higher. The average new loan written today is $735,000, more than double that figure. (Source: ABS, Lending Indicators, March Quarter 2026, abs.gov.au) The real cost of the loyalty tax in 2026 is almost certainly materially larger.
What it costs you personally
The aggregate number is striking. But the personal number is what hits home.
If you took out your mortgage three to five years ago and have not renegotiated, the ACCC's data suggests you are likely paying around 0.58% more than a new customer at the same bank. On a $275,000 balance that is roughly $1,595 a year in excess interest. On a $500,000 balance it is around $2,900. On a $735,000 loan, today's national average for new borrowers, it is over $4,260 every year.
But those are annual figures. The loyalty tax does not stop after one year.
Applying the ACCC's documented 0.58% rate gap to a $735,000 loan over a standard 25-year remaining term, the difference in total interest paid over the life of the loan is approximately $117,000. On the ABS median outstanding balance of $275,000, the same calculation produces a life-of-loan difference of approximately $44,000.
Seeing that you are paying 0.58% more than you need to is abstract. Seeing that it will cost you over $100,000 across the life of a typical Australian home loan if nothing changes, is not.
That is not a rounding error. That is a holiday home. A child's education. A retirement top-up. Quietly leaving your account every month, because your bank is counting on you not looking.
Note: Life-of-loan figures are Bheja.ai estimates calculated by comparing total interest payable on a principal and interest loan at 6.58% versus 6.00% over 25 years, applied to ABS loan size data. The 6.00% base rate reflects the RBA's current average variable rate for new owner-occupier loans. The 0.58% gap is sourced from the ACCC Home Loan Price Inquiry Final Report, November 2020. Individual circumstances will vary significantly depending on loan balance, remaining term, and actual rates.
Why most people never find out
The ACCC did not just document the loyalty tax. It investigated why millions of borrowers continue paying it even when the savings from switching are substantial.
The answer is structural. The regulator found a lack of easily accessible and transparent pricing information, making it genuinely hard for borrowers to know whether they are being overcharged. It found that the discharge and switching process is unclear, uncertain and lengthy enough to cause borrowers to give up. And it found a general lack of borrower engagement with the home loan market driven by the complexity of doing anything about it.
In plain language: the system is not set up to make this easy for you. Banks do not proactively call existing customers to offer them a better rate. The ACCC noted that banks "do not have strong incentives to make prices more transparent" and benefit from the fact that most borrowers do not regularly shop around.
This is not accidental. It is the business model.
This is where Bheja.ai comes in
The ACCC put its finger on the core problem back in 2020: the loyalty tax persists because borrowers do not have easy access to the information they need to know whether they are being overcharged. Lenders know the market. Borrowers do not. And that information gap costs Australians billions every year.
Bheja.ai closes that gap. And it starts with something very simple: a personalised mortgage health check that tells you, in plain numbers, exactly how much your loyalty is costing you right now.
Not a rough estimate based on national averages. Your loan. Your balance. Your lender. Your rate. Compared to the whole market today.
The health check shows the gap between what you are currently paying and what a borrower with your exact profile would pay elsewhere. It shows you what that gap costs you per month and per year. And it projects how much you will have overpaid in total if nothing changes over the remaining term of your loan. For most people, that number is the moment it becomes real.
Because seeing that you are paying 0.58% more than you need to is abstract. Seeing that this has cost you $11,000 over the past three years, and will cost you another $38,000 over the next decade if you do nothing, is not.
From that point, Bheja.ai does not leave the work to you. It is not a comparison site that shows you a table and wishes you luck. It is not an alert service that pings you and then asks you to figure out the next step. Bheja.ai connects to your mortgage account via open banking, Australia's government-mandated data-sharing framework, and continuously monitors your loan against every relevant lender in the market. When a materially better deal exists for your profile, it tells you. And because open banking pre-populates your application, switching does not mean weeks of paperwork, broker calls, and document uploads. It happens in minutes.
The loyalty tax is not a one-time problem you solve by switching. The gap starts building again the moment you do. The only way to stop paying it permanently is to have something always watching. That is what Bheja.ai is.
Your bank has been charging you a loyalty tax for years. It is time to find out exactly how much, and to stop paying it.
Your mortgage has a leak. Your bank knows. Now... you know too.
If you know someone paying off a home loan, a friend, a family member, a colleague, tell them about Bheja.ai
Because that $100,000? It belongs to them.
- Pravin Mahajan, Founder, Bheja.ai
Start your personalised mortgage health check at bheja.ai
Sources
- ACCC, Home Loan Price Inquiry Final Report, November 2020: accc.gov.au/about-us/publications/home-loan-price-inquiry-final-report
- ACCC, Home Loan Price Inquiry Interim Report, April 2020: accc.gov.au
- Australian Treasury, Media Release on ACCC Final Report, 5 December 2020: ministers.treasury.gov.au
- ABS, 2021 Census of Population and Housing: abs.gov.au/census
- ABS, Housing Occupancy and Costs, 2019-20: abs.gov.au/statistics/people/housing/housing-occupancy-and-costs
- ABS, Lending Indicators, March Quarter 2026: abs.gov.au/statistics/economy/finance/lending-indicators/latest-release
Methodology note: The $3 billion annual estimate is a Bheja.ai calculation using exclusively Australian government data. Inputs: 3.8 million mortgaged households (ABS 2021 Census); 50% assumed to have held their loan for 3 or more years (conservative given standard 25-30 year loan terms); national median outstanding mortgage balance of $275,000 (ABS Survey of Income and Housing 2019-20, the most recent official figure available); ACCC-documented average rate gap of 0.58% for borrowers three to five years into their loan (ACCC Home Loan Price Inquiry Final Report, November 2020). The $275,000 median balance predates Australia's property price surge and is likely to understate the current cost significantly. Updated ABS survey results are expected mid-2027.
