What Is the Difference Between Fixed and Variable Interest Rates in Australia?
Fixed rates lock your repayment for a set term; variable rates can move at any time. The definitions, the trade-off, and what stays the same.
What is the difference between fixed and variable interest rates in Australia?
A fixed rate locks in your interest rate — and so your minimum repayment — for an agreed period, usually one to five years. A variable rate moves up or down over the life of the loan, in line with changes your lender makes to its own rate. The difference isn’t about which one is cheaper over time; no source can settle that in advance. It’s about whether you’re paying for repayment certainty over a set period, or keeping the flexibility that comes with a rate that can move either way.
What is a variable interest rate home loan?
A variable rate is the interest rate your lender sets on your loan, and it can rise or fall at any time. Lenders adjust variable rates in response to their own funding costs, movements in the Reserve Bank of Australia’s cash rate target — 4.35% as at July 2026, held at the Board’s meeting announced 16 June 2026 — and competitive pressure from other lenders. A lender is not obliged to pass on every cash rate change in full, or at all — the variable rate on your loan is the lender’s own rate, not the cash rate itself.
Variable loans typically come with more flexibility elsewhere: most allow unlimited extra repayments without a cap, and many can be paired with an offset account, which reduces the interest charged by treating linked savings as if they’d reduced your loan balance. Product availability varies by lender, so check the specific loan’s terms.
What is a fixed interest rate home loan?
A fixed rate is locked for an agreed term, commonly one to five years. Your repayment amount stays the same for that period regardless of what happens to rates elsewhere, and it also doesn’t fall if rates drop. At the end of the fixed term, the loan usually reverts to a variable rate, or you can negotiate a new fixed term if your lender offers one.
Fixed loans generally limit how much extra you can repay each year without a fee, and offset accounts are often unavailable or only partially available on a fixed rate. Repaying the loan early, refinancing, or switching rate type inside the fixed term can trigger a break cost — how that cost is calculated is set by the lender, and no consistent public figure or formula exists across the market.
How do lenders test whether you can afford either type?
Regardless of whether you choose fixed, variable or a mix, lenders don’t assess your capacity to repay using today’s rate alone. As at July 2026, APRA’s guidance on prudent lending describes ADIs applying an interest-rate buffer of at least 3.0 percentage points over a loan’s rate under Prudential Standard APS 220, tested against both new and existing debt commitments. That buffer is the same whether the loan you’re applying for is fixed or variable — it’s designed to check you could still service the loan if rates were materially higher than they are today. For more on how the buffer works in practice, see our guide to the interest rate buffer.
What’s the practical trade-off between fixed and variable?
| Factor | Fixed | Variable |
|---|---|---|
| Repayment amount | Locked for the fixed term | Can change at any time |
| Extra repayments | Often capped annually | Usually unlimited |
| Offset account | Often unavailable or limited | Usually fully available |
| Cost of exiting early | A break cost may apply | Generally only standard fees |
| Exposure to rate rises | None during the fixed term | Full exposure |
| Benefit from rate falls | None during the fixed term | Full benefit |
None of these rows makes fixed or variable the “better” choice — each is a genuine trade-off between certainty and flexibility, and which side of it matters more depends on your own budget, plans and comfort with uncertainty.
Can you have both at once?
Yes. A split loan divides your balance into a fixed portion and a variable portion, each behaving exactly as described above for its own share. You choose the split — commonly expressed as a percentage of the loan in each — and the fixed and variable rules apply separately to each part for as long as the fixed term runs.
Where do you take this next?
There’s no single right answer between fixed and variable, and this article isn’t the place to model your own numbers against either — that depends on your income stability, your plans for extra repayments, and how you’d feel if rates moved either way during a fixed term. A licensed mortgage broker can run both scenarios against your situation. If you’re earlier in the process and still working out your deposit, see our guide to how much deposit you really need for a first home.
