Interest rates have long been the Reserve Bank of Australia’s (RBA) go-to tool for keeping inflation in check. By adjusting the cash rate, the RBA aims to influence borrowing costs, spending, and overall economic activity. But in today’s economy, many experts question whether these rate changes alone can effectively tame rising prices with record government spending and supply chain inflation.
How Do Rate Changes Work?
The RBA sets the official cash rate, which flows through to mortgage rates, savings accounts, business loans, and more. Traditionally, when rates go up:
- Borrowing becomes more expensive.
- Home loans and other debts cost more to service, reducing household spending.
- The Australian dollar often strengthens, helping lower import prices.
This mechanism still matters, but we’re seeing signs that the economy doesn’t respond as neatly as it once did.
Why Rate Hikes Are Less Effective Today
1. Uneven Impact on Households
Not all Australians feel rate hikes the same way. Around 37% of households have a mortgage, and they’re the most affected. Outright homeowners or renters experience the impact indirectly—through rent increases or higher living costs—without the same immediate cash-flow squeeze.
Data from the ABS shows that mortgage ownership has risen over time, yet nearly two-thirds of Australians don’t have a home loan at all. This makes rate hikes a blunt instrument, hitting some hard while barely touching others.
2. Supply-Driven Inflation
Here’s the big issue: recent inflation isn’t just about consumer demand—it’s also been driven by supply shocks. Global shipping disruptions, energy price spikes, and housing shortages have pushed prices higher. Interest rate hikes won’t fix supply issues; they can only cool demand, often at the cost of slowing the economy and raising financial stress for mortgage holders.
3. Fiscal Policy and Wealth Effects
Government spending, subsidies, and supports can dilute the effect of RBA’s tightening moves. Additionally, wealthier households, boosted by property and superannuation gains, may continue spending even as rates rise. This adds another layer of complexity, making cash rate adjustments less predictable and less powerful overall.
What’s the Alternative?
The solution isn’t to abandon interest rates—they still matter. But relying on rates alone is unrealistic in today’s climate. Experts suggest a coordinated approach, including:
- Better fiscal-monetary alignment – Avoiding conflicting policies where government spending drives demand while the RBA tries to slow it.
- Housing supply reforms – Tackling rental pressure and affordability issues that interest rates alone can’t solve.
- Macroprudential measures – Tools like stricter lending standards can reduce financial risk without relying entirely on rate hikes.
- Supply-side policies – Addressing bottlenecks in energy, housing, and labour markets.
Final Word
Interest rates remain an essential anchor for monetary policy, but their power to control inflation on their own has diminished
. Australia faces a more complex inflation landscape, shaped by global instability, supply constraints, and structural economic shifts. For mortgage brokers and borrowers alike, this is a reminder: interest rate movements are still critical, but the bigger inflation fight involves more than the RBA alone.
Frequently Asked Questions (FAQs)
1. Why does the RBA use interest rates to control inflation?
The Reserve Bank of Australia (RBA) adjusts the cash rate because it influences borrowing and spending throughout the economy. Higher rates make loans more expensive, reducing demand and cooling inflation, while lower rates encourage spending and investment.
2. Are rising interest rates still effective at reducing inflation?
Yes, but not as effective as they once were. Interest rates still impact mortgage borrowers and business loans, but large parts of inflation today come from supply issues—such as energy prices, housing shortages, and global disruptions—which interest rates can’t fix.
3. Why don’t interest rate hikes affect everyone equally?
Rate hikes mainly hit households with variable-rate mortgages. Outright home owners, renters, and wealthier households feel less immediate pressure. This uneven impact means the policy tool works on only a portion of the population, making it a blunt instrument.
4. Can the RBA fix supply-driven inflation by raising rates?
No. The RBA’s tool targets demand, not supply. It can’t produce more housing, energy, or goods. Rate hikes can slow spending, but they won’t fix global shipping issues or labour shortages causing price spikes.
5. What other tools can help control inflation?
A coordinated approach works best, including:
- Fiscal policy alignment – Avoiding excess government spending during high inflation.
- Housing supply reform – To tackle rent-driven inflation.
- Macroprudential tools – Lending rules to manage housing credit growth.
- Supply-side strategies – Addressing structural bottlenecks in energy, housing, and labour markets.
6. What does this mean for mortgage holders?
Borrowers with variable-rate loans remain most exposed to RBA moves. Higher rates increase repayments significantly. Fixed-rate borrowers may feel the pain later as fixed terms expire. It’s more important than ever to review your loan and seek advice from a mortgage broker.
