Australian mortgages work differently enough from American ones that most refinancing advice you’ll find online doesn’t apply. Variable rates dominate here, fixed terms are short, and offset accounts do work that has no US equivalent.
The starting fact for 2026: the RBA raised the cash rate three times this year, 75 basis points in total, and held at 4.35% on 11 August while it assessed the effect. Australian borrowers are in a tightening cycle, not a loosening one.
Start with the loyalty tax, not the market
Before comparing lenders, do the cheaper thing first.
Australian lenders routinely advertise better rates to new customers than they charge existing ones. The gap is well known enough to have a name, and it means many borrowers can improve their rate without refinancing at all.
Call your lender and ask them to match their own new-customer rate. Mention that you’re comparing offers, because you are. This takes twenty minutes, costs nothing, and frequently produces most of the saving a full refinance would, minus the discharge fees, applications, or a new loan.
Do this even if you intend to move. A matched rate is your new baseline for comparison.
How the cash rate actually reaches your mortgage
It’s easy to assume the RBA moves its cash rate and every mortgage in the country adjusts by the same amount, on the same day. That’s not quite how it works, and the gap between the two matters when you’re deciding whether refinancing is worth it right now.
Variable rates do respond quickly to a cash rate move, but the size of the pass-through isn’t fixed. Lenders also factor in their own cost of funding from wholesale markets and how hard they’re currently competing for new borrowers, so a cash rate rise doesn’t always show up in full on existing variable loans. The Reserve Bank’s own research on this found that during the 2022–2023 tightening cycle, competition between lenders meant the average rate paid on outstanding variable loans rose by noticeably less than the cash rate itself, as banks fought to retain borrowers who were shopping around. That’s the mechanism behind the loyalty tax above: lenders can and do move quietly on rate for people who ask, even outside a full refinance.
Fixed rates behave completely differently. They’re priced off where wholesale funding markets expect the cash rate to be over the fixed period, not off today’s cash rate itself, which is why a lender can lift its fixed rates before the RBA has actually moved, if the market is pricing in a future rise. Once you’ve fixed, nothing the RBA does changes your repayment until the term ends and you roll onto a revert rate or refix again.
Then run the actual numbers
If you do refinance, the arithmetic is the same everywhere: total switching costs ÷ monthly saving = months to break even.
Australian switching costs typically include:
- Discharge fee from your existing lender, for closing out the old loan and its mortgage registration
- Application, settlement or valuation fees at the new one
- Government registration charges on the mortgage, which vary by state
- Break costs if you’re exiting a fixed-rate period; these can be large and are the one people underestimate
Our refinance-rates guide walks through when the maths tends to favour switching versus staying put; running your own numbers against a current offer is worth doing before you commit to an application.
The refinancing process, step by step
The mechanics behind switching lenders are the same regardless of why you’re doing it:
- Get a discharge form from your current lender and check its discharge fee and any timing requirements. Most lenders need a few weeks’ notice.
- Apply with the new lender. They’ll reassess your income, expenses and the property’s value from scratch, not just take over your old approval. A lower rate doesn’t guarantee approval if your circumstances have changed since you first borrowed.
- Get unconditional approval and a settlement date. The new lender arranges to pay out your existing loan directly to your old lender on settlement day.
- Old mortgage is discharged, new one is registered against the title. This is handled between the two lenders and, usually, a conveyancer or solicitor; you’re mostly waiting at this stage.
- Re-link everything that pointed at the old loan. Direct debits, an offset account, and any linked transaction account need to be redirected to the new lender. This is the step people most often forget, and missing a repayment because a direct debit was still pointed at a closed account is an entirely avoidable way to dent your credit file right after refinancing.
The cashback catch
Cash-back offers, a lump sum paid to you for switching, show up regularly in the Australian market, and they’re real money. They’re also the easiest part of a refinance offer to be distracted by.
The ASIC-run Moneysmart guidance on switching home loans is blunt about the actual comparison to make: weigh the new loan’s rate and fees against what you’re paying now, over the time you expect to keep the loan, and only refinance if that comparison comes out ahead. A cashback payment is a one-off. The interest rate you’re locking in applies for as long as you hold the loan, so a slightly worse ongoing rate can cost you far more than the upfront cash is worth within a year or two. Read the offer’s conditions closely too: many cashback deals carry an eligibility LVR ceiling, a minimum loan size, or a clause requiring you to repay some or all of it if you refinance away again within a set period. None of that makes the cashback a bad deal automatically. It does mean the number to compare on is the total cost over your expected time in the loan, not the size of the cheque.
Two features worth optimising
Offset accounts. Every dollar sitting in an offset reduces the balance interest is calculated on, while remaining accessible. For a borrower with a decent cash buffer, a loan with a proper offset can beat a slightly lower headline rate outright. Compare the whole package rather than the rate alone. There’s no direct US equivalent to an offset account the way HELOCs work as a separate product there; in Australia the same cash-buffer flexibility is usually built into the mortgage itself.
Short fixed terms. Fixed periods here are typically one to five years rather than the American thirty. That means a fixed rate is a medium-term decision, and there’s always a revert rate waiting at the end of it. Diarise that date the day you fix, because rolling onto a lender’s standard variable rate unnoticed is a common and expensive way to lose the benefit.
What actually drives a break cost
Break costs are the fee for leaving a fixed-rate loan before the fixed term ends, whether that’s through refinancing to another lender or just paying it off early. Moneysmart’s guidance describes it plainly: the fee can be very high, and broadly speaking, the more market interest rates have fallen since you fixed, the higher the break cost tends to be.
The logic behind that is worth understanding rather than just accepting. Your lender locked in funding at the rate you agreed to; if wholesale rates have since dropped, the lender is out of pocket relenting your remaining balance at today’s lower rates for the rest of your fixed term, and the break cost is designed to recover that gap. If wholesale rates have instead risen since you fixed, the break cost can be minimal or close to zero, because the lender isn’t giving anything up. That’s why a break cost is impossible to estimate accurately from general advice. It depends on your specific rate, how much term is left, your loan balance, and where wholesale rates sit on the day you break, not a fixed percentage you can apply universally. Ask your current lender for a specific figure before you commit to refinancing out of a fixed-rate loan.
LVR and the LMI trap
Loan-to-value ratio, or LVR, is your loan amount as a percentage of the property’s value. Borrow $450,000 against a $600,000 property and your LVR is 75%.
Lenders Mortgage Insurance applies once your LVR climbs above a lender’s threshold, commonly 80%. It’s worth being clear about who it protects: LMI covers the lender if you default, not you, even though you’re the one paying the premium.
The catch on refinancing: LMI is generally not transferable between lenders. Refinance with an LVR above the new lender’s threshold, whether because you borrowed with thin equity originally or because property values in your area have softened, and you may pay a fresh premium at the new lender, which can exceed the interest saving entirely and turn an otherwise sensible refinance into a net loss.
If you’re close to the threshold, get your equity position clear before applying: a current valuation, not the purchase price you remember. Sometimes waiting a few months, or paying down a little more of the loan, changes the arithmetic completely and avoids the premium altogether.
Context, briefly
For readers comparing internationally: the US 30-year fixed averaged 6.67% in mid-August 2026, but the products aren’t comparable. A thirty-year fixed rate barely exists in Australia, and US mortgage-rate tracking reflects a market structured very differently from this one. Comparing headline numbers across the two markets isn’t meaningful. What does transfer is the method: the break-even calculation is identical wherever you are, and the same logic runs through refinancing in Canada too, even though the fee structure and mortgage terms differ market to market.
The UK sits closer to Australia than to the US on this. Fixes there run two to five years before the loan reverts to a standard variable rate, which makes remortgaging in Britain the same recurring appointment an Australian borrower knows as a rate review.
The order to work in
- Ask your current lender to match its new-customer rate. Free, fast, often most of the saving.
- Compare offers, including offset features and the revert rate, not just the headline or a cashback figure.
- Total the switching costs, break costs and any LMI exposure included.
- Divide costs by monthly saving and compare against how long you’ll keep the loan.
- Check your equity position before applying, so LMI doesn’t ambush the result, and confirm your break cost with your current lender if you’re on a fixed rate.
Ring your lender before you do anything else on this list. It’s the one step that costs nothing and often makes the rest of it unnecessary; when refinancing makes sense and the mortgage guide are there for whatever’s still worth chasing after that call.