Super vs mortgage calculator

Estimated time: 5 mins

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Helps you work out if you are better off putting spare money into your super or your mortgage.


  • If you might need to access this money before you retire, then put it in your mortgage
  • If you earn less than $50,454, make an after-tax super contribution to get the government co-contribution
    Then use this calculator to decide where to put your remaining spare cash
  • Remember to press the "tab" or "enter" key to update the graph if you change a field

Please note: iPads and iPhones do not support Flash (as well as some other mobile devices)

If you see this message:

  • Flash may still be downloading, or
  • Your browser may not have Flash installed (You can download the latest version for free from, or
  • You are using an iPad or iPhone which does not support Flash

The MoneySmart team is working towards replacing Flash on our website so calculators will render across all devices.

About this calculator - disclaimer, assumptions & further information


  • This is a model not a prediction. Results are only estimates, the actual amounts may be higher or lower. We cannot predict things that will affect your decision such as movements in investment markets.
  • This calculator works with individual incomes, not joint incomes.
  • This calculator is not intended to be your sole source of information when making a financial decision. You should consider whether you should get advice from a licensed financial adviser.


  • Refer to the "retirement-planner-how-it-worksHow it works" section within the calculator for detailed information.
  • This calculator assumes you are already making after-tax contributions to maximise your government co-contribution. It does not include co-contribution in the calculation.
  • After you put a contribution into super it must stay there until you retire. Weigh up the benefits of extra super against your other priorities, for example paying off your credit cards.

Further information

  • You can save one or multiple versions of the calculations within MoneySmart and retrieve them at a later date
  • You can print your results
  • You will need your current mortgage details like how much you owe, the interest rate and how much time is left on the loan.
  • You will need Adobe Flashplayer

Super vs mortgage calculator FAQs - frequently asked questions

Q. How do I retrieve a saved calculator? 

A. To retrieve a saved calculator, go to the relevant calculator and click on the "select saved calculator" dropdown menu in the toolbar (see example below) and select your previously saved calculator from the list.


If you are not already logged in you will be asked to login. After entering your username or email and password, you will be able to select any previously saved results.

Q. Do calculators save data automatically?

A. No, you will need to click on the "Save" icon if you wish to save your budget.

Q. Why can't I see your calculators on my iPad or iPhone?

A. This calculator was built using Flash at a time when Flash was accessible to the majority of internet users. Since then, iPads and iPhones have become very popular and they do not support Flash files. The MoneySmart team are recreating all our calculators in a format that will be usable on all devices. Unfortunately, this process will take a while, so stay tuned!

Q. Are there advanced settings I can change?

A. Yes, within the calculators that you can save, there are some defaults and assumptions that you can adjust as required. These can be found within the "How it works" or "Settings" sections.

Q: My super fund return is lower than my mortgage interest rate, why does the calculator tell me I will have more if I put spare cash in super?

A: Money salary sacrificed into super is taxed at 15%. Money credited to your mortgage has been taxed at your marginal tax rate, likely to be much higher. For example, someone earning between $37,001 and $80,000 has a marginal tax rate of 32.5% (not including the Medicare levy). This means there is more money going into super:

  • $1,000 - $325 (tax) = $675 to mortgage
  • $1,000 - $150 (tax) = $850 to super

Related links

Last updated: 28 Jul 2016