When the Reserve Bank lifts the cash rate, Australia’s major banks move with impressive speed. Within days, variable mortgage rates rise, and lenders send higher repayment notices to existing borrowers.
What banks do not pass on automatically is their sharpest pricing.
If you have held your home loan with the same bank for more than two or three years, chances are you are paying what the industry calls the loyalty tax. It is the gap between the rate your bank charges you as a reliable existing customer, and the discounted home loan rates it offers to attract brand new customers.
As of September 2026, that loyalty gap is not loose change. It can add up to thousands of dollars of your post-tax household income every year.
Why banks fight for new borrowers (and ignore existing ones)
Lending volumes across Australia are down roughly 30% to 40% from previous highs. High interest rates and tighter borrowing limits mean fewer people are buying homes right now.
That leaves major banks with a real challenge. With fewer new property buyers entering the market, lenders have to compete hard to win over existing borrowers from rival banks to keep their loan books growing.
This creates a split market:
- Banks regularly reserve discounted variable interest rates for new-to-bank borrowers.
- Lenders introduce upfront cashback incentives, fee waivers, and sharper margins to attract external homeowners looking to refinance their home loan.
- Meanwhile, long-standing customers who set up their mortgages two, three, or four years ago remain on back-book pricing that slowly widens above competitive market rates.
The business model relies on customer inertia. Paying the loyalty tax by staying quiet is an expensive habit.
The real dollar cost of a 0.40% rate gap
When people hear about a 0.30% or 0.50% interest rate difference, it sounds modest. In a conversation about percentages, it is easy to shrug off.
When you apply that difference to a modern mortgage over a 25 or 30-year term, the numbers get real very quickly.
Here is what securing a better home loan rate by just 0.40% looks like on an owner-occupier loan:
- On a $600,000 loan, shaving 0.40% off your rate saves around $150 every month. That is $1,800 a year back in your account.
- On a $1,000,000 balance, a 0.40% discount puts roughly $250 a month back in your pocket. That is $3,000 every single year.
- On a $1,500,000 mortgage, that same cut saves about $375 a month, or $4,500 annually.
Think about what $3,000 or $4,500 after tax actually covers. That is a family holiday, school fees, or an extra lump-sum payment that knocks years off your loan term.
Why most borrowers never ask for a better interest rate
If the savings are so obvious, why are millions of Australians still overpaying on their mortgages? It usually boils down to three myths:
- "It is too much paperwork." Borrowers remember the mountain of payslips, bank statements, and tax returns they pulled together when they first bought their house. They assume a mortgage review requires the same effort.
- "My bank will reward loyalty." Retail banks do not reward loyalty with lower rates. They reward action. If you do not ask, you do not get.
- "Rates are high everywhere, so what is the point?" While official rates are up across the board, the spread between the cheapest and most expensive variable rates in the market is wider than it has been in years.
The two paths to lower home loan repayments
Getting a better deal on your mortgage does not always mean packing up and switching banks. A strategic review usually involves two steps:
Step 1: Internal retention negotiation
Before looking at other lenders, a finance broker can benchmark your current rate against what your existing bank offers new customers. Armed with that data and your loan-to-value ratio, your broker can request a formal pricing review directly from your bank's retention division. If they agree to sharpen your rate, your monthly repayments drop immediately with zero paperwork and no lender switching.
Step 2: External refinancing
If your current lender refuses to provide a competitive rate, refinancing your home loan to an alternative lender becomes the practical choice. A complete review by your broker evaluates lenders to identify competitive headline rates, superior offset account functionality, flexible repayment structures, and cashback incentives that offset any nominal switching fees.
Ready to refinance your mortgage?
With living costs where they are, paying an extra $200 or $400 a month to a bank out of loyalty makes no sense.
You do not need to spend your lunch break on hold listening to automated banking music. With access to more than 60 residential lenders, BlueRock’s Finance brokers can review your current rate, handle the negotiations, and make sure your home loan is working for you, not your bank. Contact us via the form below for a quick rate check.
