How Swap Rates Determine Your Fixed Home Loan Rate
ADS Team
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August 21, 2026
1 day ago
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In short: A lender offering you a fixed rate must eliminate its own exposure to rate movements, which it does using an interest rate swap - paying fixed and receiving floating. Your fixed rate is therefore the swap rate for that term plus a margin, which is why fixed rates move on market expectations rather than on RBA decisions.
Key takeaways
- Fixed rates track swap rates, not the current cash rate.
- They move in advance of RBA decisions, as expectations shift.
- Break costs exist because the lender must unwind that swap.
- A falling swap curve means fixed rates below variable - not a bargain, a forecast.
The mechanism
- You want a 3-year fixed rate.
- The lender's funding is largely floating.
- It enters a swap: pays fixed, receives floating, for three years.
- Its exposure is neutralised; your rate is the swap rate plus a margin.
Why fixed rates lead the RBA
Swap rates reflect what the market expects the cash rate to average over the term. When expectations shift, swap rates move immediately - so fixed home loan rates change weeks or months before any RBA decision.
If 3-year fixed sits below variable, the market is pricing cuts. That is information about expectations, not an opportunity the lender has overlooked.
Where break costs come from
Exiting a fixed loan early leaves the lender holding a swap it no longer needs. If rates have fallen, unwinding costs money - and that cost is passed to you as the break cost.
If rates have risen, unwinding is favourable to the lender and the break cost is typically nil. This is why break costs are unpredictable until calculated on the day.
Frequently asked questions
Can I see swap rates?
Yes - the ASX publishes interest rate swap data and the RBA publishes related series. They will not match your loan rate, because the lender's margin sits on top.
Why is 5-year fixed usually higher?
Longer swaps embed more uncertainty and a larger term premium. Lenders also hold more capital against longer commitments.
Does this mean fixing is never worthwhile?
No - it means fixing buys certainty rather than a discount. If a stable repayment has value to you, that is a legitimate reason to pay for it.
Related reading
- The Yield Curve: What Bond Markets Say About Rates
- Break Costs on Fixed Loans: How They Are Calculated
- Fixed vs Variable in a Hiking Cycle: The 2026 Decision Framework
Sources
- Interest rate swap data — ASX
- Capital market yields, table F2 — Reserve Bank of Australia
Information current as at 2 August 2026.
General advice warning: This article contains general information only. It does not take into account your objectives, financial situation or needs, and it is not personal credit or financial advice. Consider whether it is appropriate for you and seek advice from a licensed credit representative before acting.
Any interest rate shown is an example only and is not an offer of credit. Where a rate is quoted, the applicable comparison rate is available from the relevant lender and should be considered alongside it.
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