TL;DR — Key takeaways
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You’ve heard rates have dropped. You’ve spotted a headline rate that looks better than what you’re paying. But before you start filling out forms, there’s one number you need to know: your break-even point.
A refinance home loan calculator does the maths for you. It takes your current loan, a potential new rate, and the real costs of switching, then tells you exactly how many months until you come out ahead. Here’s how it works and what to watch out for.
Rate gap as of August 2026: The average existing variable rate on Australian home loans is 6.92% p.a. The lowest available refinance rate is 5.69% p.a. On a $600,000 loan with 25 years remaining, that gap equals roughly $480 per month — or $5,760 per year.
What does a refinance home loan calculator actually show you?
A refinance calculator takes three inputs and produces three outputs that actually matter.
If you plan to keep the loan longer than the break-even period, refinancing stacks up. If you’re selling in 12 months and break-even is 18 months away, it doesn’t.
A real example: $600,000 loan, 6.92% to 5.69%
Using the figures that reflect August 2026 market conditions:
Three months to break even, then $480 every month in your pocket after that. Over the remaining 25-year term, the total interest saving exceeds $144,000.
These figures are illustrative. Your actual saving depends on your loan balance, remaining term, and the specific rates available to you. Use our loan repayment calculator to run your own numbers, then speak to a Rateseeker broker to find what rates you actually qualify for.
What does it actually cost to refinance in Australia?
Switching costs are the biggest reason people put off refinancing, often unnecessarily. For a standard variable-to-variable refinance in 2026, here is what to expect:
One thing worth noting: many lenders currently offer cashback of $2,000 to $4,000 to attract refinancers. If the cashback exceeds your switching costs, you’re ahead from day one before a single interest saving hits. A broker can tell you which lenders are running cashback offers right now.
Watch out for fixed rate break costs: If you’re currently on a fixed rate, breaking the loan early can trigger a break cost calculated on the difference between your locked-in rate and the current wholesale rate. This can run into thousands of dollars and will significantly change your break-even calculation. Always check this figure with your lender before proceeding.
The break-even point: the only number that really matters
The break-even point is the number of months it takes for your cumulative monthly savings to exceed your total switching costs. The formula is straightforward:
Break-even (months) = Total switching costs ÷ Monthly saving
Example: $1,500 in switching costs ÷ $480 monthly saving = 3.1 months to break even.
If you plan to keep the loan past that break-even point, refinancing is worth it. If you’re selling the property or paying off the loan before then, it isn’t.
Use our comparison rate calculator to verify the true cost of any new loan before you commit. A low headline rate with high fees can be worse than a slightly higher rate with no fees once you factor everything in.
When does refinancing make sense?
As a general rule, refinancing is worth exploring if you can answer yes to at least two of these:
When refinancing may not be worth it
Refinancing is less likely to stack up in these situations:
One thing worth trying before you refinance at all: call your current lender and ask them to match a competitor’s rate. Lenders would rather lose margin than lose the loan. This costs nothing and sometimes works. If they say no, you have your answer.
Should you keep repayments the same or drop them?
When you refinance to a lower rate, most people drop their repayments to the new minimum. That’s fine and frees up cash each month. But there’s a better move financially.
If you keep paying the same amount you were before, more of each repayment goes toward principal at the lower rate. Your loan clears faster and you save significantly more interest overall. On the $600,000 example above, maintaining $4,247 in monthly repayments instead of dropping to $3,767 would pay the loan off around 4 years earlier.
Use our extra repayments calculator to see how much time and interest you save by keeping your repayment the same after switching.
What about refinancing to access equity?
Some borrowers refinance not just to get a lower rate but to unlock equity they’ve built up for a renovation, investment property deposit, or other purpose. This is called a cash-out refinance.
In this case, you borrow more than your current balance and the difference is paid to you. Your debt goes up and your repayments increase. Check your borrowing power first and make sure the new total loan amount keeps your LVR at or below 80% to avoid LMI.
If you’re considering using equity for an investment property, read our guide on investment home loans and how structuring works across multiple properties.
How long does refinancing take in 2026?
For a straightforward refinance with a clean credit history, most borrowers are through the process in 2 to 4 weeks. Here’s what the typical timeline looks like:
A broker handles most of this on your behalf, including chasing documents, coordinating discharge with your existing lender, and ensuring settlement goes smoothly.