Every month, when the Reserve Bank of Australia announces its interest rate decision, headlines flash across news sites and mortgage holders wait anxiously to learn whether their repayments will change. But what exactly is the cash rate, how does the RBA decide when to change it, and what does it mean for your mortgage? This guide demystifies the connection between monetary policy and your monthly budget.
What Is the RBA Cash Rate?
The cash rate is the interest rate that banks charge each other for overnight loans. When banks have surplus funds at the end of each day, they lend to banks that have shortfalls. The RBA sets a target for this rate and uses various mechanisms to ensure the actual rate stays close to the target.
While consumers never borrow at the cash rate directly, it serves as the foundation for all other interest rates in the economy. Banks use the cash rate as a benchmark when setting their lending and savings rates. When the cash rate rises, mortgage rates typically rise. When it falls, mortgage rates usually fall.
Why Does the RBA Change the Cash Rate?
The RBA's primary objective is to maintain price stability, which it defines as keeping inflation within a target band of two to three percent over time. Inflation is the general increase in prices across the economy. When inflation is too high, your money buys less, eroding purchasing power. When it is too low or negative, economic growth can stall.
The RBA uses the cash rate as its main tool to influence inflation. When inflation is rising above the target band, the RBA typically increases the cash rate. Higher interest rates make borrowing more expensive and saving more attractive, which reduces spending and slows price increases. Conversely, when inflation is too low or the economy needs stimulation, the RBA cuts the cash rate to encourage borrowing and spending.
The RBA also considers employment, economic growth, and financial stability when making rate decisions. These factors all feed into the broader picture of whether the economy is running too hot, too cold, or just right.
How Rate Changes Affect Your Mortgage
When the RBA changes the cash rate, most lenders adjust their variable mortgage rates by a similar amount within days or weeks. A twenty-five basis point increase in the cash rate typically translates to a twenty-five basis point increase in your variable mortgage rate.
The impact on your repayments depends on your loan size and current rate. On a five hundred thousand dollar loan, a twenty-five basis point rate increase adds approximately seventy-six dollars to your monthly repayment. Over a year, that is over nine hundred dollars in additional interest. Use our mortgage calculator to see how different rates affect your repayments.
If you have a fixed rate mortgage, your repayments remain unchanged during the fixed period regardless of RBA decisions. However, new fixed rate products will reflect market expectations of future rate movements, and your rate when the fixed period expires will be influenced by where rates sit at that time.
Why Banks Do Not Always Follow the RBA
While lenders typically move their variable rates in line with cash rate changes, they are not obligated to do so. Banks fund their lending through various sources beyond the overnight cash market, including customer deposits, bonds, and international borrowing. If their funding costs change independently of the cash rate, they may adjust mortgage rates accordingly.
Competitive pressure also plays a role. Lenders compete for borrowers and depositors, and these competitive dynamics can lead to rate movements that differ from RBA changes. You may notice lenders passing on rate cuts in full while delaying or reducing rate increases, or vice versa, depending on market conditions.
Preparing for Rate Changes
Smart mortgage holders prepare for interest rate movements rather than being caught off guard. If you have a variable rate mortgage, ensure your budget can accommodate potential rate increases. The RBA typically moves rates in increments over time rather than making single large changes, but a series of increases can add up significantly.
Consider building a buffer in your offset account or savings to absorb higher repayments if needed. Stress test your budget by calculating what your repayments would be if rates increased by one or two percentage points. If that scenario would cause genuine hardship, you might consider fixing some or all of your loan for certainty.
Stay informed about economic conditions and RBA commentary. The RBA publishes statements explaining its decisions and provides forward guidance about its thinking. While they do not pre-announce rate changes, their language gives clues about whether rates are likely to rise, fall, or stay on hold.
Fixed Rates and Rate Expectations
Fixed rate mortgages are priced based on market expectations of future cash rate movements, not the current cash rate. If markets expect rates to rise, fixed rates will typically be higher than current variable rates. If markets expect rates to fall, fixed rates may be lower than variable rates.
Choosing between fixed and variable rates involves predicting whether you would be better off with certainty at today's fixed rate or flexibility with a variable rate that may move up or down. Neither choice is objectively better; it depends on your personal circumstances, risk tolerance, and views on the economic outlook.
The Bigger Picture
Understanding the RBA cash rate helps you make sense of your mortgage in the context of the broader economy. Rate decisions are not arbitrary; they reflect the RBA's assessment of what the economy needs to maintain stable prices and sustainable growth.
When rates rise, remember that it typically means the economy is strong and inflation is a concern. When rates fall, it often indicates the RBA is trying to stimulate a sluggish economy. Your mortgage repayments are one small part of these larger economic forces.
Regularly review your mortgage to ensure it remains competitive regardless of where rates move. Use our loan comparison tool to evaluate your options and consider whether refinancing could improve your position. An informed borrower is a successful borrower.