How interest rates affect your mortgage, super and investments

Interest rates can affect much more than your home loan repayments. Changes in rates can flow through to savings accounts, property, financial markets and the broader cost of living.

But those effects are not always straightforward. Higher rates may increase borrowing costs while benefiting some savers, and different types of investments can respond in different ways.

Understanding how these connections work can make economic headlines easier to put into context and help you see how one change can affect several parts of your financial picture.

Key takeaways

• Interest rates can affect mortgage repayments, borrowing costs and household cash flow.
• Higher rates may increase returns on some savings accounts, while lower rates can reduce the interest savers receive.
• Superannuation does not have one interest rate. The impact depends on the investments held within your super option.
• Shares, bonds, property and cash can respond differently when rates change.
• The same rate change can affect households differently depending on debt, savings and investments.

What are interest rates and why do they change?

Interest rates are the cost of borrowing money or, from a saver’s perspective, the return received for allowing a bank or other institution to use your money.

In Australia, the Reserve Bank of Australia sets the cash rate target, which influences other interest rates across the economy, including lending and deposit rates. The RBA explains how the cash rate works.

The RBA uses monetary policy to influence economic activity and inflation. Changes to the cash rate can flow through to home loans, business borrowing, savings rates, spending and investment, although the timing and size of those effects can vary. You can read more about how monetary policy moves through the economy.

How do interest rates affect your mortgage?

Interest rates can affect how much borrowers pay on their mortgage. When a lender reduces their rates, repayments may decrease. Fixed-rate borrowers may not notice the effect immediately, although their repayments can change once the fixed-rate period ends.

Higher repayments can also affect the rest of a household budget. If more income is going towards the mortgage, there may be less available for savings, investing, additional super contributions or other priorities.

Moneysmart explains the differences between fixed, variable and partially fixed home loans, as well as how different rates can affect repayments and the total cost of a loan.

If your mortgage is only one of several competing commitments, it can help to look at it alongside the rest of your finances. PictureWealth explores this further in Is your financial plan built for uncertainty?.

How do interest rates affect savings accounts?

Higher interest rates can increase the return available on some savings accounts and term deposits. When rates fall, the interest paid on cash savings may also decline.

This means rate changes can affect borrowers and savers differently. Someone with a large variable mortgage may feel higher rates through increased repayments, while someone with significant cash savings may benefit from higher deposit rates.

The amount a saver actually receives depends on the account. Moneysmart’s guide to comparing savings accounts and interest rates explains bonus-rate conditions, fees and other features worth understanding.

How do interest rates affect superannuation?

Interest-rate changes do not affect all super balances the same way. The effect depends on how your super is invested because super funds can hold assets such as shares, property, bonds and cash, which may all respond differently to changing rates.

Moneysmart’s guide to super investment options explains how super funds can invest across different asset classes.

Broadly:

• Cash: higher deposit rates may increase returns available on cash holdings.
• Bonds and fixed interest: changing rates can affect income from new bonds and the value of existing bonds.
• Shares: borrowing costs, company earnings and investor expectations can influence share prices.
• Property: financing costs can affect property businesses, funds and the wider market.

Because the effect depends on the investments inside your super, an interest-rate change alone does not necessarily tell you whether your strategy should change.

If you have not looked closely at your super for some time, PictureWealth covers what to consider when reviewing whether your super strategy still fits.

How do interest rates affect shares and investments?

Interest rates can affect investments through borrowing costs, business earnings, investor sentiment and the way future income is valued. However, different investments and companies can respond differently to the same rate change.

For businesses, higher borrowing costs can make debt or new investment more expensive. Higher household borrowing costs may also reduce consumer spending, which can affect some companies more than others.

Moneysmart’s guide to choosing investments explains the differences between shares, property, bonds and cash.

Bonds can respond differently again. If newly issued bonds offer higher rates, older bonds paying lower rates may become less attractive, which can reduce their market value. Moneysmart explains this further in its guide to bonds and interest-rate risk.

This is why a rate rise does not automatically mean every investment will fall. Different assets can react in different ways, while company-specific and wider economic factors also matter.

How do interest rates affect property prices?

Interest rates can affect property by changing mortgage repayments, borrowing costs and how much some buyers are able or willing to borrow. However, rates are only one factor influencing property prices.

Higher borrowing costs can reduce demand from some buyers, while lower rates can make borrowing cheaper. Property markets are also shaped by housing supply, population growth, employment, incomes, available credit and local demand.

For investors, rates can also change the cost of servicing an investment loan and the cash flow required to hold a property. Moneysmart’s property investment resources explain some of the costs and risks involved.

What do interest rates mean for inflation and the cost of living?

Interest rates are one of the main tools the RBA uses to influence inflation. Higher rates can reduce demand by increasing borrowing costs and encouraging saving, while lower rates can support borrowing, spending and investment.

The effect is not immediate.

For households, this can create a difficult overlap where everyday costs remain high while mortgage repayments or other borrowing costs have also increased.

That is one reason the financial impact of a rate change can feel very different from the economic explanation behind it.

What happens when interest rates fall?

When interest rates fall, variable mortgage repayments may decrease if lenders reduce their lending rates. Savers may receive lower returns on savings accounts and term deposits.

Lower borrowing costs can also influence household spending, business investment and asset markets. Fixed-rate borrowers generally will not see an immediate change because their agreed rate continues until the fixed period ends.

So while falling rates may provide relief for some borrowers, they are not automatically positive for every part of a household’s finances.

Why interest-rate changes affect everyone differently

The same interest-rate movement can affect two households very differently.

Someone with a large variable mortgage may notice a rate increase almost immediately. Someone with significant savings and little debt may experience the same environment differently because higher savings rates could increase their interest income.

Someone approaching retirement may be more focused on what changing rates mean for the mix of cash, bonds, property and shares inside their super and investments.

A strong income does not necessarily mean there is plenty of financial breathing room either. Mortgage repayments, household expenses and other commitments may all be drawing on the same cash flow. PictureWealth explores this further in High income but still feeling stretched? 7 reasons why.

That is why it can be useful to look at your mortgage, savings, super, investments and longer-term goals together rather than in isolation.

Frequently asked questions

Do higher interest rates affect superannuation?

Yes, but generally indirectly. Super funds invest in assets including shares, bonds, property and cash. Interest-rate changes can affect those assets differently, so the impact on your super depends on your investment option and what it holds.

What happens to shares when interest rates rise?

Higher rates can increase borrowing costs for companies, affect household spending and change investor expectations about future earnings. This can put pressure on some shares, but the effect varies across companies and industries.

Are higher interest rates good for savings?

They can be. Higher rates may lead to better returns on some savings accounts and term deposits, although providers do not necessarily change deposit rates by the same amount or at the same time.

What happens to mortgage repayments when interest rates fall?

Repayments on a variable-rate mortgage may decrease if the lender reduces the loan’s interest rate. Fixed-rate repayments generally stay the same until the fixed period ends.

Look at the whole financial picture

Interest rates can affect your mortgage, savings, super, investments and property in different ways.

The important part is understanding how those pieces connect.

A higher rate may increase one household’s mortgage repayments while increasing another household’s savings income. A change in market conditions may also affect one super investment option differently from another.

Looking at your finances together can make it easier to understand where an interest-rate change may have the greatest impact and how different financial priorities interact.

If you would like help understanding how your mortgage, cash flow, super and investments fit together, get in touch with the PictureWealth team.