The fixed vs variable decision on an Australian mortgage is ultimately a bet on future interest rates, combined with a set of practical trade-offs around flexibility, features, and break costs. Here is how each type works, what the current rate environment means for the decision, and the features that matter most.
A variable rate mortgage has an interest rate that moves in line with market conditions, primarily the Reserve Bank of Australia's cash rate. When the RBA changes the cash rate, lenders typically (though not automatically) pass on some or all of the change to variable rate borrowers within a few weeks.
Variable rates offer the most flexibility. Most variable rate loans allow unlimited extra repayments, come with an offset account or redraw facility, and can be refinanced without a break cost. This flexibility has real financial value, particularly for borrowers who expect to make lump sum repayments, sell within a few years, or want to use an offset account to reduce interest.
The trade-off is uncertainty. If rates rise, your repayment goes up. In the 2022 to 2023 rate cycle, Australian variable rate borrowers saw their rates increase by more than 4 percentage points in under 18 months, adding hundreds of dollars per month to repayments on a typical loan.
A fixed rate locks your interest rate for a specified term, typically 1, 2, 3, or 5 years in Australia. During the fixed period, your rate does not change regardless of RBA decisions. At the end of the fixed term, the loan rolls to a variable rate (sometimes called a "revert rate"), which is often uncompetitively high.
Fixed rates provide certainty. You know exactly what your repayments will be for the fixed period, which is useful for budgeting and risk management. This was extremely valuable during the 2022 to 2024 rate hiking cycle for borrowers who had fixed before rates rose.
The trade-offs are significant. Fixed rate loans typically restrict extra repayments, often to $10,000 per year. They rarely include offset accounts, or offer a limited offset with a fee. If you break a fixed rate loan early (because you sell, refinance, or pay it off), you pay a break cost calculated on the interest rate differential, which can run to tens of thousands of dollars when rates have moved substantially.
As at mid-2026, the RBA cash rate stands at 4.35%, having been hiked multiple times during 2026. Big Four bank standard variable rates are in the range of 7.94% to 8.24%. Competitive variable rates from non-bank lenders and challenger banks are available from approximately 5.69% for well-qualified borrowers. Fixed rates from major lenders are broadly similar to competitive variable rates, reflecting market expectations around the rate cycle.
When fixed rates are close to competitive variable rates, as they are currently, the argument for fixing is weaker than when fixed rates carry a meaningful discount. You are paying for certainty but not getting a lower rate in exchange.
Fixed rates carry an implicit market forecast embedded by the bank. If a lender is offering a 2-year fixed rate at 6.0%, that rate reflects the bank's expectation that variable rates over the next 2 years will average somewhere around that level. Banks employ entire teams to forecast rates. When you take a fixed rate, you are effectively betting that rates will be higher than the bank's forecast. That is possible, but it requires a view that is genuinely contrary to what sophisticated rate forecasters believe.
A split loan divides your mortgage between a fixed and a variable portion. For example, you might fix 60% of your loan balance for 2 years and leave 40% on a variable rate. This gives you partial certainty on repayments while retaining flexibility on the variable portion for extra repayments, offset account use, and refinancing.
Split loans are more complex to manage and compare, but for borrowers who want some rate certainty without fully sacrificing flexibility, they are worth considering. Most lenders offer splits.
When a fixed rate term expires, the loan automatically rolls to the lender's standard variable rate unless you actively refinance or renegotiate. The standard variable rate is almost always uncompetitive. Some lenders' standard variable rates sit 1.5% to 2% above the best available variable rates in the market.
Borrowers who fix, forget to review at expiry, and roll to the standard variable rate can end up on a worse rate than if they had never fixed at all. If you fix, set a calendar reminder for 3 to 4 months before your fixed term expires and use that time to reassess your rate or refinance.
| Feature | Variable | Fixed |
|---|---|---|
| Unlimited extra repayments | Yes | Usually no ($10k/yr cap common) |
| Offset account | Yes | Rarely (some lenders at extra cost) |
| Redraw facility | Yes | Limited or no |
| Early exit without break cost | Yes | No |
| Rate certainty | No | Yes (for fixed term) |
An offset account is particularly valuable for borrowers with savings. Every dollar in an offset account reduces the loan balance on which interest is calculated. On a $600,000 loan at 6%, having $60,000 in an offset account saves approximately $3,600 per year in interest. Fixed rate loans, which largely exclude offset accounts, forfeit this saving.
Do you plan to sell or refinance in the next 1 to 3 years? If yes, fixed rate break costs make fixing high-risk.
Do you have savings sitting in a bank account? If yes, the offset account benefit of variable makes a meaningful difference.
Is your income variable or uncertain? Certainty on repayments has more value if your income is less predictable.
What does the fixed rate premium look like? If fixed rates carry a significant premium over the best variable rates available, you are paying for certainty upfront. If they are at parity, the economic argument for fixing is weaker.
Check what rate you are on and how it compares to the current market.
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