What is the Mortgage Loyalty Tax and How much is it costing Australians?

The mortgage loyalty tax is the extra interest Australian homeowners pay simply for staying with the same lender. Banks offer lower rates to attract new customers while existing borrowers quietly absorb higher rates on the same loan product. It is not disclosed. It is not illegal. And in the three markets where it has been formally measured by regulators in Australia, the United Kingdom, and India, it costs homeowners an estimated minimum of A$100 billion every year. The real figure, across all developed mortgage markets, is almost certainly larger.

The loyalty tax is the gap between the interest rate your bank charges you as an existing borrower and the lower rate it offers to new customers for the same loan type.

Banks compete aggressively for new business. To win it, they discount. Once you are a customer, that incentive disappears. Your rate stays the same while new borrowers get a better deal. The longer you stay without renegotiating, the wider that gap becomes.

Yes. In 2020, the Australian Competition and Consumer Commission (ACCC) conducted a formal Home Loan Price Inquiry. It found that the rate gap between new and existing variable rate borrowers grows steadily with loan age.

As of September 2020, the average rate difference was:

(Source: ACCC, Home Loan Price Inquiry Final Report, November 2020, accc.gov.au)

The Australian Treasury summarised the finding plainly: "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."

Competition and broker activity has narrowed the average gap between new and existing variable rates. The RBA's February 2026 Credit Markets Bulletin found the spread between average new and average outstanding variable rates had declined from around 35 basis points in 2019 to approximately 3 basis points as of December 2025.

(Source: RBA, Recent Changes in Credit Markets and Their Implications for Monetary Policy, Bulletin, February 2026, rba.gov.au)

This matters. Borrowers who actively renegotiated or switched during the 2023 to 2025 period likely closed much of their gap. Borrowers who did not are still on the rates they last agreed to, which for many was 2020, 2021, or 2022. The loyalty tax does not fall uniformly. It falls hardest on the most disengaged.

On a $735,000 loan, the current national average for new borrowers (ABS, Lending Indicators, March Quarter 2026), a 0.58% rate gap costs approximately $4,263 per year in excess interest.

Over the life of the loan, applying the ACCC's 0.58% gap to a $735,000 principal and interest loan over 25 years at a new rate of 6.14% versus 6.72%, the total difference in interest paid is approximately $117,000.

On the ABS median outstanding balance of $275,000, the same calculation produces a life-of-loan cost of approximately $44,000.

Methodology: Bheja.ai estimates derived by applying the ACCC's documented rate differentials to ABS loan balance data. The 6.12% new rate for owner-occupier variable rate across Open banking Product reference data for Australian lenders, July 2026. Individual outcomes vary by loan balance, remaining term, and lender.

The ACCC identified three structural reasons borrowers do not act even when the savings are substantial:

Information asymmetry. Pricing information is not easily accessible or transparent. Most borrowers do not know what rate a new customer would be offered at their own bank today.

Switching friction. The discharge and switching process is unclear, uncertain, and lengthy enough that many borrowers who start the process give up.

Low engagement. The complexity of the home loan market and the effort required to act keeps most borrowers passive.

(Source: ACCC, Home Loan Price Inquiry Final Report, November 2020, accc.gov.au)

The ACCC also found that banks have no strong incentive to make pricing more transparent. The system is designed to preserve this asymmetry.

The loyalty tax persists because of an information gap. Lenders know the market. Most borrowers do not.

Bheja.ai closes that gap with a personalised mortgage health check. Not a national average estimate. Your loan. Your balance. Your lender. Your rate. Compared against the whole market today.

The health check shows:

• The gap between your current rate and what a borrower with your exact profile could access today
• What that gap costs you per month, per year, and over the remaining life of your loan
• Whether the numbers support a reprice request, a refinance, or staying put

From there, Bheja.ai does not leave the work to you. It connects to your mortgage data through open banking, Australia's government-mandated data sharing framework, and monitors your loan continuously against every relevant lender. When a materially better deal exists for your profile, it surfaces it. Because open banking pre-populates your application, switching does not mean weeks of paperwork and broker calls. It happens in minutes.

The loyalty tax is not a one-time problem. The gap starts building again the moment you switch. The only permanent solution is continuous monitoring. That is what Bheja.ai is.

No. Regulators in the UK, the US, and India have all documented the same structural problem. The mechanism is identical everywhere: lenders offer sharp rates to attract new customers, then allow existing borrowers to drift onto less competitive pricing. The longer you stay without asking questions, the more you pay.

In the United Kingdom, this was investigated formally. The Competition and Markets Authority found the loyalty penalty was costing consumers approximately £4 billion a year (A$7.7 billion) across mortgages, savings, insurance, mobile, and broadband. Citizens Advice put it more simply: British consumers were losing £11 million every single day (A$21 million) simply for staying with the same providers. The problem was eventually considered serious enough that the Financial Conduct Authority banned the practice outright in insurance in January 2022, estimating the ban would save consumers £4.2 billion over 10 years (A$8 billion). The fact that a regulator had to legislate against it is itself telling.

In the United States, Bankrate research published in June 2026 found that 87% of American mortgage borrowers were overpaying relative to what they could access by shopping around, with the average excess cost running at approximately US$3,343 (A$4,815) per household per year. Across roughly 50 million owner-occupier mortgage households, that implies an annual aggregate in the order of US$65 billion (A$93.6 billion). The Consumer Financial Protection Bureau has separately documented that borrowers who do not compare lenders consistently pay more over the life of their loan.

India has perhaps the most precisely documented version of this problem. In October 2019, the Reserve Bank of India mandated that all new floating-rate home loans be linked to the repo rate under a new External Benchmark Lending Rate framework. Existing borrowers on the older Marginal Cost of Funds Based Lending Rate system were not automatically moved across. The result is a two-tier market the RBI's own data confirms: approximately 36% of existing floating-rate home loans remain on the legacy system as of December 2024, paying 0.30% to 0.80% more than equivalent new borrowers. On a home loan market of over ₹33.5 lakh crore (A$506 billion), that gap costs existing borrowers an estimated A$5 billion to A$14 billion per year. To switch to the better system, borrowers must actively request it and pay their bank a conversion fee of ₹2,000 to ₹10,000. Most have not.

In the three markets where this has been formally measured by regulators — Australia, the UK, and India — plus the US where Bankrate's June 2026 research documented 87% of borrowers overpaying, the annual cost of the mortgage loyalty tax is conservatively over A$100 billion.

This is not a niche problem in one country. It is a structural transfer of wealth from homeowners to lenders, in every developed mortgage market that has been studied, sustained by the same two things everywhere: borrowers not knowing what rate they should be paying, and switching being made harder than it needs to be.

Bheja.ai starts in Australia, where the regulatory baseline is the clearest and where open banking makes continuous monitoring and frictionless switching possible for the first time. The problem it solves exists in every market it enters next.

Note: UK figure covers five consumer categories combined. US figure is Bankrate industry research, not a regulatory finding. India figure is a Bheja.ai estimate using RBI and NHB data. All AUD conversions use July 2026 mid-market exchange rates.

The global A$100 billion estimate is the sum of documented figures across Australia, the United Kingdom, the United States, and India, using government regulators and major financial research institutions as the only sources. Individual market methodologies are detailed in the sources section below.

The Australian component, A$3 billion per year - is a Bheja.ai calculation using exclusively Australian government data. Inputs: 3.8 million mortgaged households (ABS 2021 Census); conservative assumption that 50% have held their loan for three or more years, a modest estimate given standard loan terms of 25 to 30 years; national median outstanding mortgage balance of $275,000 (ABS Survey of Income and Housing 2019-20, the most recent official figure available, with the follow-up survey cancelled due to data quality concerns and no confirmed replacement publication date); 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 dates from 2019-20, before Australia's property price surge pushed loan sizes significantly higher. The average new loan written today is $735,000 (ABS Lending Indicators, March Quarter 2026), more than double that figure. The Australian figure is a conservative floor, not a ceiling. All AUD conversions for non-Australian figures use July 2026 mid-market exchange rates.

1. ACCC, Home Loan Price Inquiry Final Report, November 2020: accc.gov.au/about-us/publications/home-loan-price-inquiry-final-report
2. ACCC, Home Loan Price Inquiry Interim Report, April 2020: accc.gov.au
3. Australian Treasury, Media Release, 5 December 2020: ministers.treasury.gov.au
4. ABS, 2021 Census of Population and Housing: abs.gov.au/census
5. ABS, Housing Occupancy and Costs, 2019-20: abs.gov.au/statistics/people/housing/housing-occupancy-and-costs
6. ABS, Lending Indicators, March Quarter 2026: abs.gov.au/statistics/economy/finance/lending-indicators/latest-release
7. RBA, Recent Changes in Credit Markets and Their Implications for Monetary Policy, Bulletin, February 2026: rba.gov.au/publications/bulletin/2026/feb
8. CMA, Loyalty Penalty Super-Complaint Response, December 2018: gov.uk/government/publications/loyalty-penalty-super-complaint
9. Citizens Advice, Loyalty Penalty Super-Complaint, September 2018: citizensadvice.org.uk
10. FCA, General Insurance Pricing Practices, Policy Statement PS21/5, May 2021: fca.org.uk/publication/policy/ps21-5.pdf
11. Bankrate, Mortgage Loyalty Tax Research, June 2026: bankrate.com
12. CFPB, Mortgage Market Activity and Trends: cfpb.gov/data-research/research-reports
13. DealPlexus, Repo Rate vs MCLR vs EBLR, April 2026: dealplexus.com/blog/repo-rate-vs-mclr-vs-eblr
14. RBI Annual Report 2025: rbi.org.in/publications
15. National Housing Bank, Outstanding Home Loan Data, September 2024, cited in 1Finance Research: indiamacroindicators.co.in
16. Paisa.io, Home Loan Rate Conversion: MCLR to Repo Rate Strategy, June 2025: paisa.io/knowledge/loans/repo-linked-rates-and-conversion-fees