What's best for your spare cash depends on your age, goals and circumstances.
It may be the result of thrift or a windfall. Suddenly you find you have a few thousand dollars up your sleeve and you want to make it count.
Do you throw it at your mortgage, make a personal super contribution or park it in a term deposit?
Before you act you need to think about your goals and your overall financial situation (see box). Someone in their 20s saving for a trip will need a different strategy to a 55-year-old focused on boosting their retirement savings.
"People confuse tools with objectives. You need to look at the purpose of your savings first, then look at the investment structure and asset classes," says AMP financial planner Andrew Heaven.
Centric Wealth financial planner Greg Pride agrees. "It is not about returns. The focus needs to be on what you would like to achieve and how to make that happen given your resources," he says.
SUPERANNUATION
Super is the most tax-effective vehicle for long-term savings, provided you don't need to access your money before retirement, because investment earnings are taxed at 15 per cent rather than at your marginal tax rate and once you retire you can withdraw savings tax-free.
If you earn less than $37,000 there is no point putting your $5000 into super for the tax benefit alone because your marginal rate of tax on earnings outside super is also 15 per cent.
But if you qualify for the government's super co-contribution it may be worth tipping some cash into super. If you earn less than $31,920, the government will match your voluntary contributions dollar for dollar up to a maximum of $1000. The co-contribution phases out for incomes above $61,920.
"If you expect you will qualify it is good to invest regularly - say $20 a week - so you will have the money there at the end of the financial year," Heaven says. Using this strategy, a 40-year-old earning part-time income of $28,000 and contributing $20 a week could boost their super by $48,000 by age 65.
MORTGAGE
As a rule of thumb, people on higher incomes generally gain more by making additional mortgage repayments.
If you put $5000 into your mortgage redraw or offset account you are effectively earning an after-tax return equivalent to your home loan interest rate. So if you are paying 7 per cent interest your after-tax return on additional repayments is 7 per cent.
"To generate an after-tax return of 7 per cent you would need a 10-12 per cent return elsewhere to beat knocking out the mortgage," Pride says.
TERM DEPOSITS
The best rates for term deposits are now around 6 per cent but you pay tax on that interest at your marginal rate.
The average long-term return on super investment earnings after fees and tax is about 7 per cent. The actual dollar outcome will be different for everyone and depends on your age, income, mortgage balance and financial goals.
A good place to start is the "Super v Mortgage" calculator on the government's MoneySmart website (moneysmart.gov.au). Take the example of a 40-year-old on an income of $70,000 with a $300,000, 7.5 per cent mortgage. By making a one-off mortgage repayment of $5000 the calculator shows they would save $14,903 by age 65 and be $654 better off than if they had put the cash into their super fund instead.
While a guaranteed return of 6 per cent from the bank may sound appealing at a time when financial markets are volatile, it is not an effective use of your cash if you have a big credit card debt.
"You can't save and have debt at the same time. It's like being half pregnant, it's not possible. You need to look at the after-tax costs of debt," Heaven says.
Say you earn $70,000 a year, which puts you in the 30 per cent tax bracket. You have a credit card debt with an interest rate of 18 per cent and money in a high-interest account earning 7 per cent (4.9 per cent after tax).
"For every dollar of interest you earn on your savings it costs $3.67 interest on your credit card [18 divided by 4.9]," Heaven says.
Best investments close to home
Deciding how to invest a lump sum is never easy. Investors want a good return but they also want a good level of security and tax-effectiveness.
For most people, the two best places to put any windfall is towards the mortgage or superannuation. The beauty of putting money into super or the mortgage is that the effective investment returns beat just about anything else and nothing has to go into the investor's income tax return. Also, the investment risk is low.
Most other investments come with costs, such as brokerage or management fees.
It costs nothing to pay down the mortgage. And most superannuation funds have low administration fees, though the money cannot be withdrawn tax-free until age 60.
If you think you may want to redraw the money, an offset account tied to the mortgage is a good idea.
The money held in the offset account reduces the balance of the mortgage on which interest is calculated.
The best way to maximise the benefit of an offset account is for borrowers to have their pay go straight into the offset account, which saves interest.
The most effective way to get ahead
O Clear non-deductible debt on your credit cards, personal or home loans
O Build an emergency fund in a highinterest account, term deposit, mortgage redrawor an offset account.
O If you have no debt and plan to buy a house in five years, invest in growth assets such as shares.
O If you have no debt other than a mortgage, dump the funds into a redraw or offset account.
O If you want to put the cash aside for retirement, put it in super where it will be tax free once you retire.
Source: AMPs Andrew Heaven
Frequently Asked Questions about this Article…
Mortgage vs super: should I put spare cash into my mortgage or into superannuation?
It depends on your age, goals and circumstances. Super is the most tax-effective vehicle for long-term savings because investment earnings are taxed at 15% and withdrawals can be tax-free in retirement, but you can’t access that money until retirement (generally age 60). Making extra mortgage repayments effectively earns you an after-tax return equal to your mortgage interest rate, so higher‑income earners often gain more by reducing their home loan. Use a calculator like MoneySmart’s “Super v Mortgage” to compare outcomes for your situation.
Are extra mortgage repayments better than putting money in a term deposit?
Often yes, because extra repayments reduce the amount of interest you pay on the loan and give you a guaranteed after‑tax return equal to your mortgage rate. Term deposit rates are around 6% before tax, and interest is taxed at your marginal rate, which can make them less attractive if your mortgage rate is higher. Consider your loan rate, tax bracket and whether you need liquidity before choosing.
Is contributing to super worth it for tax reasons?
Super is tax‑efficient for long‑term savings because earnings inside super are taxed at 15% rather than your marginal rate and can be withdrawn tax‑free in retirement. However, if you earn less than $37,000 there’s little tax benefit to putting $5,000 into super since your marginal tax on outside earnings is also about 15%. If you earn under $31,920 you may qualify for the government co‑contribution (dollar‑for‑dollar up to $1,000), which can make voluntary contributions worthwhile.
How can the government super co-contribution help me save for retirement?
If you earn less than $31,920 the government will match your voluntary personal super contributions dollar‑for‑dollar up to a maximum of $1,000, with the co‑contribution phasing out for incomes above $61,920. If you expect to qualify, investing regularly (for example $20 a week) can ensure you hit the threshold by year‑end — the article gives an example where a 40‑year‑old on part‑time $28,000 income contributing $20 a week could boost their super by about $48,000 by age 65.
Should I clear credit card debt before investing in savings or term deposits?
Yes — clear non‑deductible, high‑interest debt first. The article highlights that you can’t effectively save while carrying expensive debt: for example, someone on $70,000 paying 18% on a credit card while earning 7% interest (4.9% after tax) on savings will pay far more interest on the debt than they earn on savings (the cost ratio in the example is about 3.67). Prioritise paying down high‑rate debt to improve your overall financial position.
What is an offset account or mortgage redraw and when should I use one?
An offset account is a transaction account linked to your mortgage; money held in it reduces the loan balance on which interest is calculated, delivering the same interest saving as extra repayments but with easier access. A redraw facility lets you withdraw extra repayments you’ve made. If you think you may need the money again, an offset account or redraw provides flexibility while still lowering interest costs.
What are the best places to park a windfall or lump sum?
For most people the two best places to put a windfall are toward the mortgage or into superannuation, because both typically deliver effective returns that beat many other options and have low investment risk and minimal tax reporting. Before deciding, clear non‑deductible debt, build an emergency fund (in a high‑interest account, term deposit, redraw or offset), and match the choice to your timeframe — e.g., super for retirement, offset/redraw for money you may need again soon.
How do I decide between investing in shares, super, or paying down the mortgage for a lump sum?
Start with your objective: what are you saving for and when will you need the cash? Younger investors saving for a home or a five‑year goal may favour growth assets like shares, whereas someone focused on retirement should weigh super’s tax advantages. If you already have mortgage debt, paying it down (or using an offset) often beats other low‑risk options; use tools like the MoneySmart Super v Mortgage calculator to compare personalised outcomes.