You’ve probably heard the terms “official cash rate” and “mortgage interest rate” in the news or when you go for a home loan. Sometimes they are even used in the same sentence. They’re related, but they’re not the same. Many borrowers get confused by this.
The official cash rate is the rate set by the Reserve Bank of Australia (RBA). However, your mortgage interest rate is the rate decided by your lender. The difference between the two is where banks add their margin and where you might find chances to save on your home loan.
Official Cash Rate
The cash rate is the key interest rate determined by the official central bank, the RBA. It’s basically the rate banks charge each other for overnight loans. The RBA uses it to keep the economy steady, making sure inflation stays low, people continue to work, and the economy runs smoothly.
For example, the RBA recently reduced the cash rate to 3.60%. This move is designed to help keep inflation around 2.1% and unemployment at about 4.3%. In simple terms, the RBA adjusts the cash rate to balance how much people borrow and spend.
Moreover, the cash rate isn’t something decided in any way. The RBA reviews it regularly at board meetings. Such that for 2025, after the August cut, the next meetings are set for
- 29–30 September
- 3–4 November
- 8–9 December
These meetings help the RBA keep a close eye on the economy and make quick decisions when needed.
Mortgage Interest Rate
Your mortgage interest rate is the rate your lender charges you on your home loan. And not like the official cash rate, these are set by lenders and can vary.
But, sure, the cash rate has an influence, but it’s far from the whole story. Lenders look at their own costs, how fierce the competition is, the risk they see in lending to you, and how the economy’s doing overall.
That’s why your mortgage interest rate doesn’t always move in step with the cash rate. Sometimes it remains the same even if the cash rate changes or may shift more or less than the official rate.
Putting it in a scenario, when the RBA cuts the cash rate, lenders don’t always rush to follow it. They consider other aspects too. Aspects like their costs and priorities.
Moreover, strong competition between lenders can also lead to mortgage rates temporarily below the cash rate. Especially when they offer special deals or cashback offers.
Thus, the cash rate is just one factor. But your mortgage interest rate depends on several things, including lender choices and the economy. So, watching both can actually help you understand your costs and choose the right type of home loan.
Cash Rate vs. Mortgage Interest Rate
There are a lot of aspects in which these two terms differ from each other.
| Aspect | Official Cash Rate | Mortgage Interest Rate |
| Who sets it | Reserve Bank of Australia (RBA) | Individual lenders like banks and financial companies |
| Purpose | To regulate the economy and inflation | The cost borrowers pay on their home loans |
| How is it used | Benchmark rate for overnight interbank loans | Applied to your home loan repayments |
| Influence | Influences lending rates across the economy | Influenced by the cash rate, plus lender costs and margins |
| Movement | Adjusted regularly by the RBA board | Varies based on lender decisions and market conditions |
| Impact on buyers | Indirectly affects borrowing costs | Directly determines your monthly repayments |
How Does the Cash Rate Affect Mortgage Interest Rates
When the Reserve Bank of Australia adjusts the cash rate, it sets off a ripple effect in the lending market. However, banks often respond by changing their mortgage interest rates, but it’s not always immediate or in equal measure.
Like, even before the RBA’s recent cut to 3.60%, mortgage interest rates were quite different depending on the lender. For example:
- ANZ’s rate was around 5.50%
- Commonwealth Bank’s was a bit higher at about 5.64%
- Westpac offered roughly 5.44%
- ING was at 5.39%
- Athena was close to 5.49%
This tells us something important that mortgage rates don’t just follow the cash rate as it is. Banks check on different things, like their costs, their willingness to take risks, and their competitors’ actions.
But yes, sometimes, they pass on cuts before the rate cut to attract more borrowers, while others might reduce partially to protect their profits.
What Can Influence the Cash Rate?
The RBA doesn’t just look at one thing when deciding the cash rate, it considers several factors, such as
Inflation
As per the RBA, the inflation should fall between 2 and 3 percent. This is because more inflation can cause an imbalance in the economy overall. So, if prices rise fast, it might raise the cash rate to slow things down. On the other hand, if inflation is low, it could cut the rate to encourage people to spend more.
Employment
When more people work, it’s obvious the economy tends to be stronger because there’s more money flowing through businesses. But if unemployment rises, spending slows, and businesses feel the pinch. In that situation, the RBA may cut rates to improve hiring and get things back on track.
Economic Growth
Economic conditions can also play a major role in how the RBA sets the cash rate. Such that when the growth is slow, the RBA is likely to lower the rate to make borrowing easier.
As a result, more businesses will invest and more people will spend, thereby improving the economy overall.
Wage Growth
Then there are rising wages, which can often lead to increased spending, which is no doubt good for the economy. But it can also drive prices up.
Likewise, if wages grow too fast, the RBA raises the cash rate to keep inflation in check. And when wages get stable, it lowers the rate to help improve spending.
Global Events
Just like any other factor, global events also have a major impact on RBA decisions. For example, when the Trump administration imposed tariffs on certain imports, it resulted in global trade tensions.
This slowed trade flows and created uncertainty in many economies, including Australia, as export demand and commodity prices felt the ripple effect. So, the RBA also considers while deciding whether to cut the rate or hold.
How Will Your Repayments Change After the Cash Rate Cut?
The impact of the cash rate is not only visible in the economy as a whole. Instead, it has a major impact on your mortgage repayments, too. For example, if rates drop, you can save more money on your repayments.
Say you’ve got a $600,000 home loan on a 30-year term at 5.60% interest. Before the rate cut, your repayments would be around $3,449 per month.
However, after the rate cut of 0.25%, if your lender follows it, your repayments fall to about $3,356 per month. And that’s roughly $93 saved every month or more than $1,100 a year, just from a slight change.
But there is a possibility that not all lenders immediately follow the rate cut. That’s why it pays when you keep an eye on your rate and see if you can negotiate a better deal or refinance to one.
What Is the RBA and How Does It Control the Cash Rate?
The Reserve Bank of Australia (RBA) is like the country’s money manager. It’s independent from the government and has one big mission that is to keep our economy stable, inflation in check, and Australians in jobs.
And the official cash rate is one of its major tools. So, every few weeks on scheduled board meeting dates, the RBA looks at the latest numbers. It checks inflation, unemployment, wage growth, economic activity, and even what’s happening overseas.
Based on this data, the RBA chooses to either
- Lower the cash rate to encourage borrowing and spending
- Raise the cash rate to slow things down and control inflation
- Or leave it as it is to keep the economy on the right track
But whatever decision it takes, it creates a ripple effect on the entire financial system. For example, it has reduced the rate to 3.60%, so this will eventually impact borrowings, interest rates, employment, and the economy as a whole.
Conclusion
Though the official cash rate and the mortgage interest rate sound similar. But in reality, there are many differences between them, including their different purposes, impacts, and the authorities managing them.
The cash rate is a tool used by the Reserve Bank of Australia to guide the economy. However, the mortgage interest rates are set by lenders based on market conditions, competition, and your personal borrowing profile. It’s just that the cash rate has a significant impact on the economy as a whole, while mortgage interest rates impact individuals.
For more information, call us on 1300 GET LOAN or 0456 456 267 or book an appointment at Nfinity Financials.
Frequently Asked Questions
Here are the answers to the most commonly asked questions to give you more clarity on the official cash rate and mortgage interest rate.
Q1. What is the meaning of the official cash rate and the current cash rate?
The official cash rate is the RBA’s benchmark lending rate. The rate at which banks internally charge for overnight loans. The current cash rate is 3.60% (August 2025).
Q2. How is mortgage interest calculated?
Generally, mortgage interest is calculated on your outstanding balance using your interest rate and repayment frequency. But there are other factors too, which are considered, like loan term, LVR (Lender Valuation Ratio), credit history, and type of property.
Q3. Is mortgage interest added daily?
Yes, mortgage interest is typically calculated daily and charged monthly by most lenders in Australia. This means even small changes in your balance, such as extra repayments, can help reduce the total interest you pay over time.
Q4. Is the official cash rate the same as the interest rate?
No, both of these are closely related to each other but are different. The official cash rate is set by the Reserve Bank of Australia, while mortgage interest rates are determined by lenders based on it and other market factors.
