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Fixed versus variable home loans in a hiking cycle
What fixing actually buys, why fixed pricing follows the swap curve rather than the cash rate, what break costs depend on, and how splits and expiry work.
What fixing actually buys
A fixed rate buys payment certainty for a defined term, and nothing else. It does not protect the property value, your employment, or your rate after expiry, and it is not a bet you win if rates rise, because the lender has already priced its own expectation in. Fixed home loan pricing follows wholesale swap rates for the matching term rather than the cash rate, which is why fixed rates move in the weeks between Reserve Bank meetings and occasionally move in the opposite direction to the cash rate.
So the decision is narrower than it is usually presented. You are choosing between a known payment and a payment that moves, at a price the market has already set. Anyone who tells you which will prove cheaper across the term is guessing, and a fixed-rate decision built on that guess is a forecast dressed up as a strategy.
The cycle you are deciding in
As at September 2026 the cash rate is 4.35 per cent after three increases during 2026. The Reserve Bank held unanimously on 11 August and the next decision is 29 September. Nothing in that sequence entitles anyone to tell you that cuts are coming, and the pass-through of any decision to variable rates is a lender pricing choice rather than an automatic adjustment.
What the cycle does change is the shape of the risk. When variable rates have already risen three times, the household most exposed is the one with no buffer and a repayment that has moved twice inside a year — certainty is worth more to them than an eighth of a percentage point. A household holding a large offset balance and a genuine monthly surplus is in the opposite position, and should think hard before giving up the offset.
What fixing costs you in features
Most fixed products cap additional repayments at a set dollar allowance each year, with the figure varying by lender, and charge a fee or break cost beyond it. Offset accounts are generally unavailable, or only partly effective, against a fixed portion. If your plan depends on parking a bonus, an inheritance or a tax refund against the loan, fixing the whole balance quietly defeats it.
Portability, redraw and repricing behave differently too. A variable borrower can ask their lender for a discount at any time and take the file elsewhere if the answer is no. A fixed borrower has almost no leverage until expiry, because the exit itself is priced. That loss of negotiating position is the cost people notice least when they sign and most a year later.
Break costs, and why direction matters
A break cost is not a penalty, it is the lender recovering an economic loss. When you fix, the lender funds the loan against the wholesale curve for that term. If wholesale rates for the remaining term have fallen since you locked in, exiting early leaves the lender re-lending the money for less than it committed to, and the shortfall is passed to you. If wholesale rates have risen since you fixed, there may be little or no loss to recover and the administrative fee can be the larger number.
The quantum depends on the balance, the time left in the fixed term, and the movement in the curve — not on a published fee schedule, which is why no calculator can quote it. The only figure worth acting on is a written payout quote from your lender for a specific date. Do not assume the direction of that number in either cycle, and do not commit to a settlement date before you hold it.
What a split actually solves
Splitting the loan fixes part of the balance and leaves the rest variable. Its real function is not averaging the rate, which it only does incidentally. It is keeping offset and unlimited extra repayments working on the variable portion while capping payment volatility on the part of the debt you could not absorb an increase on.
That means the sensible way to size a split comes from your budget rather than a round number. Work out the repayment increase you could not survive without cutting something that matters, fix approximately that much of the balance, and leave the remainder flexible. A 50/50 split chosen because it sounds balanced usually leaves either too little in offset or too little certainty.
The expiry is the part that hurts
At the end of a fixed term the loan reverts to the lender’s variable rate for that product, which is frequently well above what the same lender advertises to new customers. No one is obliged to tell you the revert rate is uncompetitive, and the default outcome of doing nothing is paying it, often for years.
Put a reminder in your calendar 90 days before expiry. That is enough time to ask your existing lender for a repriced rate in writing, compare it against an external switch including discharge and application costs, and decide whether to re-fix, go variable or split — before the first higher repayment leaves your account.
Deciding on your own numbers
The choice comes down to three questions only you can answer: how much repayment movement your household can absorb, how likely you are to sell or refinance inside the fixed term, and whether you have money to put against the loan. A broker’s contribution is putting the lender-specific rules — repayment caps, offset availability, portability conditions, rate lock fees — beside those answers rather than beside a rate table.
This page describes how fixed and variable structures behave as at September 2026 and is general information for Australian readers. It is not a rate quote, not a forecast, and not a recommendation to fix or stay variable — pricing, break costs and product conditions come from your lender in writing.
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FAQ
Should I fix my home loan in 2026?
There is no general answer, and be wary of anyone who offers one. The cash rate is 4.35 per cent after three rises during 2026 and the Reserve Bank held unanimously on 11 August, but fixed pricing already reflects what the market expects. Fix when payment certainty is worth more to you than offset access and flexibility.
Do fixed home loan rates follow the RBA cash rate?
Not directly. Fixed pricing tracks wholesale swap rates for the matching term, so it can move between Reserve Bank meetings and sometimes moves opposite to the cash rate. Variable rates are the ones lenders reprice after a decision, and even then the size and timing of the pass-through is a lender choice.
What determines a fixed rate break cost?
The loan balance, the time remaining in the fixed term, and how wholesale rates for that remaining term have moved since you locked in. If they have fallen, the lender has a loss to recover and the cost can be large. If they have risen, there may be little to recover. Only a written payout quote is reliable.
Can I make extra repayments on a fixed home loan?
Usually up to a capped amount each year, with the allowance set by the lender, and a fee or break cost beyond it. Offset accounts are generally unavailable or only partly effective on fixed portions. If extra repayments are central to your plan, keep a variable portion or check the specific product limits before fixing.
What happens when my fixed rate expires?
The loan reverts to the lender’s variable rate for that product, which is often above the rate the same lender offers new customers. Nobody is required to warn you. Set a reminder 90 days out, ask for a repriced rate in writing, and compare it against switching before the first reverted repayment is taken.
Is a split loan better than choosing one or the other?
It is a different trade rather than a better one. A split keeps offset and unlimited extra repayments working on the variable portion while capping volatility on the fixed portion. Size it from the repayment increase your budget could not absorb, rather than picking a round percentage because it sounds even.
Does fixing protect me if I need to sell the property?
No, and this is where fixing catches people. Selling inside the fixed term triggers whatever break cost applies on that date, and portability — moving the loan to a new security — depends on lender policy, simultaneous settlement and the replacement property qualifying. If a sale is realistically possible, say so before you fix.
Can I lock a rate before settlement?
Only by buying a rate lock, which is a separate product with its own fee and expiry date, charged either as a flat amount or a percentage of the loan depending on the lender. Pre-approval never locks pricing by itself, and a rate quoted at application can change before the loan funds.