Why fixed rates change ahead of the cash rate

Fixed home loan rates change ahead of the cash rate because they are priced from a different benchmark. A variable rate reflects the cost of short-term money today, which follows the Reserve Bank of Australia (RBA) cash rate target closely. A fixed rate reflects the cost of locking in money for two, three or five years, and that cost is set in wholesale markets by what investors expect the cash rate to average over the whole period. When those expectations shift, fixed rates shift with them, whether or not the RBA has done anything.

This is why lenders can cut fixed rates while the cash rate is on hold, or raise them months before the first official increase. The movement is information about market expectations. It is not a forecast that borrowers can rely on, and the sections below explain both the mechanism and its limits.

How lenders fund and price fixed rate home loans

A lender that offers a three year fixed rate is promising to receive the same interest rate for three years, while most of its own funding costs rise and fall with short-term rates. According to RBA Bulletin articles on bank funding, the major banks raise about two thirds of their funding from deposits and most of the rest from wholesale debt, and much of that funding is linked, directly or through hedging, to the bank bill swap rate, a short-term market rate that moves with the cash rate and with expectations of it.

To avoid being caught between a fixed income and a floating cost, banks hedge. The RBA describes banks using interest rate swaps to convert fixed rate cash flows into floating rate ones, so that both sides of the balance sheet respond to rate changes in a similar way. The price of that hedge for a given term is the swap rate for that term.

The building blocks of a fixed rate

• A term benchmark. The RBA's explainer on bonds and the yield curve says a bank pricing a fixed rate mortgage starts with the relevant term on the risk-free yield curve. In practice the RBA reports that new fixed mortgage rates typically reference swap rates of matching term.
• A margin. The lender adds an amount to cover operating costs, the risk that some borrowers will not repay, the cost of capital and profit.
• Competitive positioning. Lenders adjust the margin up or down depending on how much fixed rate business they want to write.

As a purely hypothetical illustration, if the three year swap rate were 3.90 per cent and a lender's margin were 1.90 percentage points, its three year fixed rate would be 5.80 per cent. If the swap rate fell to 3.60 per cent the following month with the margin unchanged, the fixed rate could fall to 5.50 per cent, even though the cash rate had not moved.

Why swap rates and bond yields reflect market expectations

The RBA explains that the yield on a five year government bond reflects investors' expectations for the cash rate over the next five years. The same logic applies to swap rates. An investor can either lock in a three year rate today or roll over short-term investments for three years at whatever the cash rate turns out to be. Trading keeps the two choices roughly equal in expected value, so the three year rate settles near the expected average of short-term rates over that period, plus a premium for uncertainty.

Expectations change whenever new information arrives, such as inflation and labour market data, RBA communications, moves in overseas bond markets and commodity prices.

Markets trade every day, while the RBA's Monetary Policy Board meets eight times a year. Term rates therefore adjust continuously, and the cash rate follows later only if the Board comes to the same view.

Why fixed rates can fall while the cash rate is unchanged

Recent RBA publications give two clear examples. The May 2026 Bulletin article on bank funding costs and lending rates reports that new fixed mortgage rates declined through most of 2025 and then began to rise around the end of 2025, following swap rates of matching term. The increase in fixed rates began before the cash rate increases of February, March and May 2026 listed on the RBA's cash rate page.

The reverse happened a few months later. The RBA's August 2026 Statement on Monetary Policy notes that market pricing for further increases had eased from about one and a half increases by the end of 2026 to about half of one, that Australian government bond yields had declined slightly, and that some lenders had reduced fixed mortgage rates in June and July. The cash rate target was left unchanged at both the June and August 2026 meetings. Fixed rates fell because the expected path of the cash rate fell, not because the cash rate itself did.

Fixed rates can also move for reasons unrelated to the RBA:

• wholesale funding spreads widen or narrow with global credit conditions
• a lender may cut its margin to win market share, or raise it to slow applications
• offshore bond yields can pull Australian term rates higher or lower.

What an inverted fixed and variable rate relationship signals

The RBA describes three broad yield curve shapes. A normal curve slopes upward, with longer-term yields above short-term yields. A flat curve has similar yields across terms. An inverted curve slopes downward, which the RBA says can occur when investors anticipate future reductions in the cash rate.

The home loan market shows a similar pattern. Fixed rates sitting above variable rates suggest that markets expect the cash rate to rise or that investors want extra compensation for uncertainty. Fixed rates sitting below variable rates, an inverted relationship, suggest that markets expect the cash rate to be lower on average over the fixed term than it is today.

Relationship	What market pricing implies	What it does not tell a borrower
Fixed rates above variable	Cash rate expected to rise, or a premium for uncertainty	That fixing will save money. The expected increases are already in the fixed price.
Fixed rates close to variable	Cash rate expected to stay near its current level on average	That rates will be stable. Offsetting rises and falls can average out.
Fixed rates below variable	Cash rate expected to fall over the fixed term	That the fixed rate is a bargain. Variable rates may fall below it during the term.

The essential point is that the expected path is already built into the fixed rate. A discounted fixed rate is the market's estimate of where variable rates will average, not a gift from the lender.

Worked example: what a fixed rate discount is already pricing in

The following figures are hypothetical. Assume a $500,000 principal and interest loan over 30 years, a two year fixed rate of 5.80 per cent and a variable rate of 6.20 per cent. The starting monthly repayment is $2,933.77 on the fixed rate and $3,062.34 on the variable rate, a difference of about $129 a month. The table compares total interest over the two years under three illustrative variable rate paths, assuming the variable repayment is recalculated at each change.

Scenario over 24 months	Interest paid	Compared with fixing at 5.80%
Fixed at 5.80% for two years	$57,285	Reference case
Variable stays at 6.20%	$61,290	Fixing saves about $4,005
Variable falls once, to 5.95% after 12 months	$60,054	Fixing saves about $2,769
Variable falls 0.25 points every six months, to 5.45%	$57,576	Fixing saves about $291

In the last scenario the variable rate averages 5.825 per cent across the two years, almost the same as the fixed rate, and the two choices cost nearly the same. In other words, a fixed rate 0.40 percentage points below the variable rate is roughly what a market expecting three 0.25 point reductions over 18 months would produce. The borrower who fixes comes out ahead only if rates fall more slowly than that, and behind if they fall faster. The fixed versus variable calculator can test other paths and loan sizes.

How borrowers can read fixed rate signals without treating them as forecasts

Market pricing is the best available summary of current expectations, but it has a poor record as a prediction. The RBA's own commentary shows how quickly it moves: between the May and August 2026 Statements, the number of further increases priced in by the end of 2026 fell by about two thirds. An RBA Bulletin article documents borrowers who fixed at around 2 to 2.5 per cent during the pandemic and rolled onto rates near 6.5 per cent in 2023, a reminder that outcomes can differ widely from expectations.

A more reliable way to use the signals is as follows:

1. Read direction, not destination. Falling fixed rates indicate that expectations have eased. They do not indicate when, or whether, the cash rate will follow.
2. Compare like with like. Compare a lender's fixed rate with the variable rate the borrower could actually obtain, including any negotiated discount, rather than with a headline rate. The loan comparison page can help.
3. Treat fixing as buying certainty. The main benefit of a fixed rate is a known repayment for budgeting. Whether it also turns out cheaper is only known afterwards.
4. Test the budget both ways. Use the mortgage repayment calculator to check affordability if the variable rate rises, and the cost of regret if it falls.

Practical considerations before fixing a home loan rate

• Break costs. Ending a fixed loan early, including by selling or refinancing, can trigger a break cost. It is generally largest when wholesale rates have fallen since the loan was fixed.
• Reduced flexibility. Fixed loans commonly cap extra repayments and may not offer a full offset account. Borrowers who plan to make additional payments can estimate what is at stake with the extra repayment calculator.
• Rate lock. The fixed rate that applies is usually the one on the settlement date, so some lenders offer a rate lock for a fee.
• Splitting. Many lenders allow part of a loan to be fixed and the remainder left variable, which spreads the risk of being wrong in either direction.
• The roll-off date. At the end of the term the loan generally reverts to a variable rate that may be higher than the lender's best offer. Reviewing options a few months beforehand, including refinancing, is generally worthwhile.

More background on rate types is available on the interest rates hub and the home loans guide.

This article is general information only. It is not a prediction of interest rates or a recommendation to fix or not to fix. A licensed adviser or credit representative can assess which structure suits a particular borrower.