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Mortgage versus super - a common dilemma

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Conventional wisdom used to dictate Australians were better paying off their home loans, and then, once debt-free turning their attention to building up their super. But with interest rates at record lows and many super funds potentially offering a higher rate of return, what’s the right strategy in the current market? AMP’s Technical Strategy Manager John Perri investigates.

It’s one of the most common questions financial advisers get. Are clients better off putting extra money into superannuation or the mortgage? Which strategy will leave them better off over time? In the super versus mortgage debate, no two people will get the same answer – but there are some rules of thumb you can follow to work out what’s right for you.

One thing to consider is the interest rate on your home loan, in comparison to the rate of return on your super fund.  As banks follow the RBA’s lead in reducing interest rates, you may find the returns you get in your super fund are potentially higher. 

Super is also built on compounding interest. A dollar invested in super today may significantly grow over time. Keep in mind that the return you receive from your super fund in the current market may be different to returns you receive in the future. Markets go up and down and without a crystal ball, it’s impossible to accurately predict how much money you’ll make on your investment.

Each dollar going into the mortgage is from ‘after-tax’ dollars, whereas contributions into super can be made in ‘pre-tax’ dollars. For the majority of Australians, saving into super will reduce their overall tax bill – remembering that pre-tax contributions are capped at $27,500 annually and taxed at 15% by the government (30% if you earn over $250,000) when they enter the fund.

So, with all that in mind, how does it stack up against paying off your home loan? There are a couple of things you need to weigh up.

1. Consider the size of your loan and how long you have left to pay it off

A dollar saved into your mortgage right at the beginning of a 30-year loan will have a much greater impact than a dollar saved right at the end.

2. The interest on a home loan is calculated daily

The more you pay off early, the less interest you pay over time. In a low interest rate environment many homeowners, particularly those who bought a home some time ago on a variable rate, will now be paying much less each month for their home.

3. Offset or redraw facility

If you have an offset or redraw facility attached to your mortgage you can also access extra savings at call if you need them. This is different to super where you can’t touch your earnings until preservation age or certain conditions of release are met.

Don’t discount the ‘emotional’ aspect here as well. Many individuals may prefer paying off their home sooner rather than later and welcome the peace of mind that comes with clearing this debt. Only then will they feel comfortable in adding to their super.

Before making a decision, it’s also important to weigh up your stage in life, particularly your age and your appetite for risk.

Whatever strategy you choose you’ll need to regularly review your options if you’re making regular voluntary super contributions or extra mortgage repayments. As bank interest rates move and markets fluctuate, the strategy you choose today may be different from the one that is right for you in the future.

Case study where investing in super may be the best strategy

Barry is 55, single and earns $90,000 pa. He currently has a mortgage of $200,000, which he wants to pay off before he retires in 10 years’ time at age 65.

His current mortgage is as follows:



Interest rate

3.16% pa

Term of home loan remaining

20 years

 Monthly repayment (post tax)

$1,125.28 per month

Barry has spare net income and is considering whether to:

  • make additional / extra repayments to his home mortgage (in post-tax dollars) to repay his mortgage in 10 years, or

  • invest the pre-tax equivalent into superannuation as salary sacrifice and use the super proceeds at retirement to pay off the mortgage.

Assuming the loan interest rate remains the same for the 10-year period, Barry will need to pay an extra $820 per month post tax to clear the mortgage at age 65.

Alternatively, Barry can invest the pre-tax equivalent of $820 per month as a salary sacrifice contribution into super. As he earns $90,000 pa, his marginal tax rate is 34.5% (including the 2% Medicare levy), so the pre-tax equivalent is $1,252 per month. This equals to $15,024 pa, and after allowing for the 15% contributions tax, he’ll have 85% of the contribution or $12,770 working for his super in a tax concessional environment.

To work out how much he’ll have in super in 10 years, we’re using the following super assumptions:

  • The salary sacrifice contributions, when added to his employer SG contributions, remain within the $25,000 pa concessional cap.

  • His super is invested in 70% growth/30% defensive assets, returning a gross return of 3.07% pa income (50% franked) and 2.37% pa growth.

  • A representative fee of 0.50% pa of assets has been used.

If these assumptions remain the same over the 10-year period, Barry will have an extra $154,458 in super. His outstanding mortgage at that time is $115,650, and after he repays this balance from his super (tax free as he is over 60), he will be $38,808 in front. Of course, the outcome may be different if there are changes in interest rates and super returns in that period.

Case study where paying off the mortgage may be the best strategy

32 year old Duy and 30 year old Emma are a young professional couple who have recently purchased their first home.

They’re both on a marginal tax rate of 39% (including the 2% Medicare levy), and they have the capacity to direct an extra $1,000 per month into their mortgage, or alternatively, use the pre-tax equivalent to make salary sacrifice contributions to super.

Given their marginal tax rates, it would make sense mathematically to build up their super.

However, they’re planning to have their first child within the next five years, and Emma will only return to work part-time. They will need savings to cover this period, as well as assist with private school fees.

Given their need to access some savings for this event, it would be preferable to direct the extra savings towards their mortgage, and redraw it as required, rather than place it into super where access is restricted to at least age 60.

Source: AMP September 2021

This information is provided by AMP Life Limited. It is general information only and hasn’t taken your circumstances into account. It’s important to consider your particular circumstances and the relevant Product Disclosure Statement or Terms and Conditions, available by calling Ph: (07) 3026 3600, before deciding what’s right for you.

All information in this article is subject to change without notice. Although the information is from sources considered reliable, AMP and our company do not guarantee that it is accurate or complete. You should not rely upon it and should seek professional advice before making any financial decision. Except where liability under any statute cannot be excluded, AMP and our company do not accept any liability for any resulting loss or damage of the reader or any other person. Any links have been provided for information purposes only and will take you to external websites. Note: Our company does not endorse and is not responsible for the accuracy of the contents/information contained within the linked site(s) accessible from this page.

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