What an interest rate cut actually means for your mortgage

A rate cut reaches your loan in three stages. 

The first stage is the RBA’s decision. After each Monetary Policy Board meeting, it announces the cash-rate target at 2.30pm, with any change taking effect the following day. 

Step two is your lender. Banks aren't required to move their rates in line with the RBA. They decide whether to pass the cut on, how much of it, and when it becomes effective. Most big lenders announce their response within a day or two, but the new rate usually kicks in two to four weeks later.

Step three is your loan. If you're on a variable rate and your lender cuts, your interest charge drops from the effective date. If you're on a fixed rate, nothing changes until your fixed term ends. And even on a variable loan, your scheduled repayment may not drop automatically. More on that below.

If you want the current cash rate and the latest decision, we keep a monthly RBA cash rate update running separately. This page is the evergreen explainer.

ASIC's MoneySmart gives a clean worked example. On a $500,000 mortgage at 6.15%, repayments are around $3,056 per month. Drop the rate by 0.25% to 5.90% and the repayment falls to about $2,976 per month. Roughly $80 a month back in your pocket from a single 0.25% cut.

If a cycle of three 0.25% cuts flows through in full, the savings stack up. CBA published this table after its August 2025 cut, showing combined monthly savings across three 0.25% reductions.

Two caveats. First, this assumes the full cut is passed on. Second, if you've got money sitting in an offset or a healthy redraw balance, your interest charge is already calculated on the smaller net balance, so the dollar saving is smaller in absolute terms.

Want to check your own numbers? Run your loan through a repayments calculator with your actual rate and balance.

During the 2025 rate-cut cycle, major banks broadly passed the reductions through in full.

The RBA’s May 2026 Bulletin found that banks fully passed the 2025 cash-rate reductions through to new variable-rate housing loans. That historical result does not guarantee that every lender will pass through a future cut in full. The spread between average outstanding and average new variable mortgage rates narrowed to just 4 basis points. About as tight as it gets.

Timing is the other half of the story. In August 2025, CBA cut variable rates by 0.25% following the RBA's decision, but the change didn't take effect until 22 August. That two to four week lag is normal because banks need time to apply a rate change across millions of accounts. 

NAB took a different approach to repayments after its May 2025 rate cut. Although it reduced its standard variable rate by 0.25%, scheduled repayments did not automatically change. More than 95% of NAB customers kept their repayments the same after previous cuts, either because they wanted to pay the loan off faster or because they simply didn't act.

That can help borrowers clear their loan sooner, although some customers may simply be unaware that their scheduled repayment has stayed the same. 

If you're on a fixed rate, an RBA cut does nothing to your existing loan. You locked in a rate and a repayment for a set term. That's the deal.

For new fixed-rate loans, the picture is more nuanced. Fixed rates are influenced by matching-term swap rates and lenders’ funding costs rather than the cash rate alone. These market rates often move before an RBA decision as expectations change. Fixed mortgage rates can therefore fall before a cash-rate cut or barely move after one if lenders have already priced it in. 

The share of outstanding home loans with fixed rates fell to a historical low of less than 5% in 2025, according to the RBA Bulletin. Most Australians are on variable, and that's the loan type the cash rate directly affects.

If you're weighing up your options, our guide on choosing between a fixed or variable home loan walks through the trade-offs.

After a rate cut, you need to decide whether to reduce your repayment or continue paying the current amount. 

Some lenders automatically drop your minimum repayment after a cut. Others keep it the same unless you ask. Check your lender's default behaviour, because the two paths lead to very different outcomes.

Keep paying the same and you pay the loan off faster. NAB's example on a 30-year $550,000 mortgage after a single 0.25% cut: keeping repayments unchanged saves $83,000 in interest and clears the loan two years earlier.

Drop the repayment and you free up cash flow. That's the right call if your budget is tight, if you have young kids, if you're self-employed with lumpy income, or if your offset is already full and there's no additional interest saving from paying extra.

There's no universally right answer. If your cash flow is comfortable, keeping repayments the same is usually the smart move. If it's not, drop them and stop feeling guilty about it. Either way, ring your lender or log into the app and make the change deliberately. For more options, see our guide on reducing your home loan repayments.

Everyone talks about the rate when it moves. But over the life of a loan, structure often saves more than a 0.25% cut ever will.

An offset account reduces your loan balance dollar for dollar with cash sitting in a linked transaction account. Split loans let you fix part and keep part variable, so a cut still benefits half the loan. Redraw gives you access to extra repayments if you need them back.

When rates are steady or moving slowly, it is worth reviewing how the loan is structured. The right mix of offset, redraw and fixed or variable portions can affect the total cost well beyond the next rate decision. 

A rate cut can be a good reason to review your loan, but refinancing only makes sense when the numbers justify the switch. 

ASIC MoneySmart notes there can be an interest-rate difference of more than 2% between variable home-loan rates on the market. Borrowers with at least 20% equity have more bargaining power. MoneySmart's own worked example shows a refinance saving $84,040, or $280 a month, over a 25-year loan, with switching costs recovered in five months.

Strong case if the gap between your rate and the market is wide.

When refinancing doesn't stack up: your loan balance is small, you're on a fixed rate with break costs, or you'd trigger Lenders Mortgage Insurance again because your equity is under 20%.

Before you switch, ring your current lender and ask for a rate review. Sometimes they'll match a market rate to keep you. If they don't, you can refinance your home loan and take the saving elsewhere.

A lower rate improves serviceability, so in theory you can borrow more. In practice, the effect is smaller than most people expect. APRA requires banks and other regulated deposit-taking institutions to assess home loan applications using an interest rate at least 3 percentage points above the product rate. A 0.25% rate cut will generally reduce that assessment rate by the same amount, but the increase in borrowing power may still be modest once income, expenses, existing debts and lender policy are taken into account. 

For first home buyers, a cut helps affordability at the margin. But house prices often absorb rate cuts fairly quickly, especially in tighter markets like Brisbane and the Gold Coast. Buying at the top of your budget because rates just fell is risky. Rates move both ways, and lenders can change their expense assumptions, assessment criteria and credit policies as market conditions change. Even in a stable-looking rate environment, your borrowing power can shrink without warning.

Build a buffer of your own before you stretch.

1. Check your lender's announcement and the effective date of the new rate.

2. Check your next statement or app to confirm the new rate is showing.

3. Decide whether to keep repayments the same or drop them, and make the change deliberately.

4. Compare your rate against what's on the market for a similar loan.

5. If the gap is more than 0.5%, it's worth a proper look. Book a 20-minute review and we'll tell you honestly if switching stacks up.