Glossary
Cash Rate
The cash rate is the interest rate the Reserve Bank charges commercial banks for overnight borrowing, and it is the lever behind every mortgage, HISA and term deposit rate in Australia. When the RBA moves it, your loan reprices within weeks.
What it is
The cash rate is the interest rate the Reserve Bank of Australia charges commercial banks for overnight loans, and its target is the RBA's main policy lever. The board sets a target eight times a year, and the actual overnight rate trades within a few basis points of it. Every variable mortgage, savings account and term deposit rate in the country prices off the cash rate, directly or through the banks' funding costs.
The RBA moves the rate to steer inflation toward its 2-3 percent target band: higher rates cool borrowing and spending, lower rates do the reverse. The pandemic era took the rate to 0.10 percent; the 2022-23 tightening cycle lifted it to 4.35 percent, and the cuts since have brought it back toward the middle of the range. The level matters less than the direction: your mortgage and your savings account sit on opposite sides of every move.
Key takeaways
- The cash rate is the RBA's overnight lending rate, the lever behind every variable loan and savings rate.
- The board sets a target eight times a year, and the market trades within basis points of it.
- The RBA moves the rate to steer inflation toward the 2-3 percent target band.
- A 0.25 percent cut on a $600,000 mortgage cuts the repayment by roughly $96 a month.
- Savers and borrowers are on opposite sides of the same decision.
How it works
The transmission starts at the RBA. The board sets a target for the overnight cash rate, banks borrow and lend among themselves at that rate, and the cost of their funding moves with it. Variable mortgage rates and savings rates follow within weeks, because the banks reprice their books against the new funding cost. The interest rate entry covers the mechanics of the rates that follow.
The repayment arithmetic is the part that lands in households. A $600,000 mortgage over 30 years at 6 percent carries a $3,597 monthly repayment; a 0.25 percent cut moves the rate to 5.75 percent and the repayment to roughly $3,501 - about $96 a month, $1,150 a year. The same move runs the other way for savers: a $50,000 HISA at 5.0 percent falls to 4.75 percent, costing $125 a year. The mortgage calculator prices any rate move on your own loan.
The pass-through is the imperfect part. Banks cut mortgage rates faster than savings rates when the cash rate falls, and raise savings rates slower than mortgage rates when it rises - the margin is where the bank earns. Fixed rates sit outside the transmission entirely, priced off the banks' own funding costs. MoneySmart's guidance on interest rates makes the same point: the cash rate is the lever, and your actual rate is the lever plus the bank's margin.
Why it matters
For an Australian reader, the cash rate is the single number behind every borrowing and saving decision in the country. It is decided eight times a year by a board that does not know your name. The RBA's mandate is inflation between 2 and 3 percent, and the rate is the tool. Every cut is a subsidy to borrowers paid for by savers, and every rise is the reverse. The inflation entry covers the target band the decisions calibrate against.
A colleague named Brent (yes, that Brent) congratulated himself on a rate cut while his HISA rate fell by the same 0.25 percent the same afternoon. The cut saved him $96 a month on the mortgage and cost him $31 a month on savings, which is the same decision with two invoices. The highest-leverage thing most Australians can do is read the cash rate as what it is: the lever, not the forecast. Run every rate move through the mortgage calculator on your own loan rather than the headlines.
Real-world examples
A 0.25 percent cut on a $600,000 mortgage
The mortgage is $600,000 over 30 years at 6 percent: a $3,597 monthly repayment. The RBA cuts 0.25 percent, the lender passes it through within weeks, and the repayment falls to roughly $3,501 - about $96 a month, or $1,150 a year. Over the remaining term the cut compounds into tens of thousands of interest saved. The same arithmetic runs in reverse on every rise, which is why the direction matters more than the level.
The saver's side: $50,000 in a HISA
The HISA pays 5.0 percent while the cash rate sits above it, and the $50,000 earns roughly $2,500 a year. A 0.25 percent cut drops the rate to 4.75 percent: $2,375 a year, $125 less, without a single decision from the saver. The bank repriced the deposit the same afternoon it repriced the mortgage - savers and borrowers are on opposite sides of the same announcement. The offset account against a mortgage does not suffer the same cut, which is the buffer's other advantage.
The pass-through gap
When the cash rate falls, lenders cut variable mortgage rates within days and savings rates within weeks - the gap is the margin doing its work. A 0.25 percent cut that reaches the mortgage at 0.20 and the savings account at 0.10 leaves the bank with the difference on every balance it holds. The interest rate entry covers how the advertised rate is built, and the comparison rate is how the fees fold in. MoneySmart's rate guidance makes the same point the arithmetic does.
Common mistakes
Mistake: Assuming fixed rates follow the cash rate.
Why it bites you: Fixed rates price off the banks' own funding costs, which can move before or after the RBA. Fixing to escape a rise that never comes is the margin paid for nothing.
Mistake: Assuming the RBA controls your actual mortgage rate.
Why it bites you: The cash rate is the lever and the margin is the bank's; the two move independently. A bank can raise your rate while the Reserve Bank stands still.
Mistake: Congratulating the cut without checking the savings account.
Why it bites you: Brent's cut saved $96 a month on the mortgage and cost $31 a month on savings. The same decision sent two invoices in opposite directions.
Mistake: Predicting the cash rate from headlines.
Why it bites you: The board sets the target eight times a year against the inflation data, and the forecasters were wrong through most of the last cycle. The mortgage does not care about the prediction; it cares about the decision.
Ivy's take
I spent an afternoon reading the RBA's last twelve decisions and running each one through the mortgage calculator at my own balance so you don't have to. The pattern is mechanical: the cut lands on the mortgage within weeks, the savings rate follows within weeks more, and the margin keeps its share. Eight decisions a year, each one a subsidy to one side of the ledger paid for by the other. The direction is the only variable that matters.
Brent congratulated the cut. His HISA rate fell by the same 0.25 percent the same afternoon, and nobody mentioned that part in the news bulletin. I have stopped treating the cash rate as news; it is arithmetic with a press conference. Read the decision, run it through your own loan and your own savings balance, and let the two invoices cancel the drama.
Related jargon, defined
- RBA
- The Reserve Bank of Australia, which sets the cash rate target eight times a year.
- Inflation target
- The 2-3 percent band every rate decision is calibrated against.
- Variable rate
- A loan rate that reprices with the cash rate through the bank's funding costs.
- Fixed rate
- A locked loan rate priced off the banks' own funding costs, outside the transmission.
- Basis point
- One hundredth of a percent - the unit every rate move is measured in.
- Margin
- The gap between the cash rate and your actual rate, where the bank earns.
Frequently asked questions
What is the cash rate in Australia?+
It is the interest rate the Reserve Bank charges commercial banks for overnight borrowing, and its target is the RBA's main policy lever. Every variable mortgage and savings rate in the country prices off it, and the board reviews the target eight times a year.
How does the cash rate affect my mortgage?+
Variable mortgage rates reprice with the cash rate within weeks, because the banks' funding costs move with it. A 0.25 percent cut on a $600,000 mortgage lowers the repayment by roughly $96 a month; fixed rates sit outside the transmission.
Does a rate cut help savers?+
No. A cut lowers savings and term deposit rates by roughly the same amount, so savers are on the opposite side of the same decision. The offset account against a mortgage is the saver's workaround.
Why does the RBA change the cash rate?+
To steer inflation toward the 2-3 percent target band: higher rates cool borrowing and spending, lower rates do the reverse. The mandate is the inflation band, and the rate is the tool.
How often does the RBA meet?+
Eight times a year since 2025, with decisions announced in the afternoon Sydney time. The overnight rate trades within a few basis points of whatever target the board sets.
Disclaimer: This information is general in nature and does not constitute financial or legal advice. Always consult a qualified professional for your specific situation.
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Ivy Sinclair-Wren
Financial Chaos Analyst
Ivy Sinclair-Wren is a Financial Chaos Analyst covering investing, AI, wealth psychology, and the emotional consequences of opening finance apps during market crashes. Based in Melbourne, she specializes in demystifying the Australian tax code and helping users navigate the intersection of spreadsheet logic and human irrationality.