How the RBA’s Cash Rate Decision Flows to Your Mortgage
The Reserve Bank of Australia’s cash rate is the key benchmark interest rate in the economy. When it changes, lenders may adjust the variable interest rates they offer on home loans. For a borrower with a variable-rate mortgage, a change in the cash rate often leads to a change in the monthly repayment amount — but the actual impact depends on the loan size, the interest rate applied, and the remaining loan term.
In 2026, the RBA’s latest decision set a new cash rate, and as lenders update their variable rates, household budgets shift. The direct channel is straightforward: a lower cash rate generally means lower monthly repayments, while a higher cash rate increases them. However, the size of the change varies significantly from borrower to borrower.
Worked Examples by Loan Size
The table below illustrates how a 0.25 percentage point change in the interest rate affects monthly repayments for different loan amounts, assuming a 30-year principal-and-interest loan. The examples use a starting rate of 6.00% per annum and show the change when the rate moves to 5.75% (a decrease) or to 6.25% (an increase).
| Loan Amount | Rate 6.00% | Rate 5.75% | Change (Monthly) | Rate 6.25% | Change (Monthly) |
|---|---|---|---|---|---|
| $300,000 | $1,799 | $1,751 | -$48 | $1,848 | +$49 |
| $500,000 | $2,998 | $2,918 | -$80 | $3,079 | +$81 |
| $750,000 | $4,497 | $4,377 | -$120 | $4,619 | +$122 |
| $1,000,000 | $5,996 | $5,836 | -$160 | $6,158 | +$162 |
These figures are based on a 30-year loan term and assume the interest rate is the only variable. In reality, lenders may adjust rates by more or less than the cash rate change, and your personal circumstances will affect the final outcome.
What Your Repayment Might Look Like
For a $300,000 loan, a 0.25 percentage point cut reduces the monthly repayment by about $48. That may not sound like much, but over a year it adds up to roughly $576. For a $1,000,000 loan, the same cut reduces monthly repayments by about $160, or $1,920 over a year.
Conversely, if the RBA raises the cash rate, a $500,000 loan sees monthly repayments increase by about $81 — that’s nearly $1,000 extra per year. These examples show that the sensitivity to rate changes grows with loan size.
How Lenders Apply the Change
Not all lenders pass on the full cash rate change to their variable rates. Some may adjust their standard variable rate in line with the RBA move, while others may offer different rates to new customers or keep rates steady for a period. The actual impact on your repayment depends on the specific rate your lender charges, your loan’s interest rate type (variable or fixed), and the remaining term.
If you’re on a fixed-rate loan, the RBA decision doesn’t immediately affect your repayments until the fixed period ends. Most Australian home loans are variable, though, so the majority of borrowers will see a change in their monthly repayment when the RBA moves the cash rate.
What Borrowers Can Do
Understanding how much your repayment may change is the first step in budgeting. With the RBA’s latest decision, borrowers can estimate the impact using repayment calculators or by talking to their lender. For those who want to reduce their repayments further, refinancing to a lower rate could be an option. However, any decision to refinance should be based on a comparison of rates and fees, not just the size of the rate change.
If your budget is tight, a small change in repayments can matter. For example, a $48 monthly reduction on a $300,000 loan might cover a utility bill or groceries. A $120 reduction on a $750,000 loan could fund a weekend away. The key is to know your numbers and plan accordingly.
Summary
The RBA’s cash rate decision directly influences variable mortgage repayments, but the size of the impact depends on your loan amount and rate. The worked examples above show the difference for loan sizes from $300,000 to $1,000,000, assuming a 0.25 percentage point move. Always check with your lender for the precise change to your repayment, as individual terms and conditions vary.