You have been running the business for years. The work gets done, the invoices go out, the BAS gets lodged. And somewhere in among all that, the super never quite happened. Not through carelessness — there was always something more urgent to pay for. But you are somewhere in your forties or fifties now, you have finally had a proper look at the balance, and the number is smaller than you expected.
If that is you, you are in very large company. Working for yourself in Australia means nobody is quietly setting money aside for your retirement in the background. It also means the fix is entirely in your hands, and there is a tax deduction sitting there that a lot of sole traders either don't know about or have never got around to using.
Why the gap opens up in the first place
An employee never has to think about this. Their employer is legally required to pay the super guarantee — 12% of their earnings in the 2026-27 financial year — into a fund whether the employee notices or not. Someone on $100,000 a year has $12,000 going in annually without lifting a finger.
Nobody does that for you. There is no legal requirement for a sole trader, or a partner in a partnership, to pay themselves super. Every dollar that goes in is a dollar you decided to put there, usually in a month when the cash flow was tight and the BAS was due. Over twenty years that difference compounds into a serious gap. That is a reason to act, not a reason to feel bad about it.
The deduction that changes the maths
Here is the part too few self-employed people use. You can pay money into your own super fund out of your own pocket, and then claim that contribution as a tax deduction on your personal return. The ATO calls these personal deductible contributions, and they are open to almost anyone with a standard super fund.
The effect is that your super contribution comes out of pre-tax income instead of post-tax income. The money is taxed at 15% going into the fund rather than at your marginal rate in your own hands.
Put numbers on it. Say your taxable income for 2026-27 is $120,000, which puts you on a marginal rate of 30% plus the 2% Medicare levy — 32% on your next dollar. You contribute $20,000 to super and claim it as a deduction:
- Your taxable income falls to $100,000, cutting your tax bill by about $6,400.
- Your fund pays 15% contributions tax on the $20,000, which is $3,000.
- $17,000 is now working for you inside super.
Had you simply kept that $20,000 as income, you would have been left with $13,600 after tax. The deduction is worth about $3,400 to you on that one contribution — and the money is now invested in the most lightly taxed environment available to ordinary Australians.
The higher your income, the sharper the effect. At a 37% marginal rate plus the levy, every $10,000 contributed costs $1,500 in contributions tax and saves $3,900 in personal tax.
The catch-up rule most sole traders have never heard of
There is a limit on how much you can put in this way. It is called the concessional contributions cap, and for 2026-27 it is $32,500, up from $30,000 the year before. That cap covers everything taxed at 15% going in: your deductible contributions, plus any super an employer pays if you also work a job on the side.
But the cap is not strictly use-it-or-lose-it. If your total super balance was under $500,000 at 30 June of the previous financial year — which describes a great many self-employed Australians in their forties and fifties — you can carry forward unused cap amounts from up to five earlier financial years and use them in one hit.
For lumpy, unpredictable self-employed income, this is the rule that matters most. Lean years where you contributed little are not wasted. They quietly build headroom. When a strong year arrives, or you sell an asset and face a bigger tax bill than usual, you may find you have well over $100,000 of accumulated cap available to soak it up. You can see your exact carry-forward figure in ATO online services through myGov.
The paperwork that makes or breaks it
This deduction is lost more often through admin than through bad planning. Four things to get right:
Lodge a notice of intent. You must give your super fund a notice of intent to claim a deduction, and you must receive the fund's acknowledgment back before you claim it on your return. The notice has to reach the fund by the earlier of the day you lodge that year's tax return or the end of the following income year. No valid notice, no deduction — regardless of how sensible the contribution was.
Get the money in before 30 June. The contribution counts in the year the fund receives it, not the year you sent it. Leaving it to the last week of June is how a deduction slips into the wrong financial year.
Don't touch the money first. If you roll the balance to another fund or withdraw the contribution before the notice is lodged and acknowledged, the notice can be invalid.
Watch the age rules. If you are aged 67 to 74, you need to meet the work test — 40 hours of paid work within 30 consecutive days in that financial year — to claim the deduction, even though you no longer need it simply to contribute. From 75, you can only claim for contributions made before the 28th day of the month after the month you turn 75.
One more for strong years: if your income plus concessional contributions tops $250,000, Division 293 applies an extra 15% tax to some or all of those contributions. It is still a worthwhile deduction at that level, just a less dramatic one.
What if you are a long way behind?
Be honest with yourself about two things. First, super is locked away until you reach preservation age and meet a condition of release, so money you might need for the business or a bad quarter should not go in. A deduction is no help if it leaves you borrowing on a credit card in August. Second, a balance that is behind at 50 is not a balance that is beyond repair — you still have a decade or more of contributions and compounding ahead of you, and the catch-up cap exists precisely for people whose income has been uneven.
If this is a lean year, there is a smaller measure worth knowing. Make an after-tax contribution you do not claim as a deduction, and if your income is under $49,293 for 2026-27 the government may add up to $500 as a co-contribution, tapering out at $64,293. You need to be under 71 and to earn at least 10% of your income from employment or running a business. There is no form — the ATO works it out from your tax return.
Whatever shape your year is in, the useful habit is a standing transfer each month rather than a heroic decision each June. Small, regular and actually made beats large, planned and never quite done.
If you want the whole system in one place — caps, deductions, the catch-up rules and how to choose where your money is invested once it's in there — Super Made Simple (7th Edition) by Noel Whittaker lays it out in plain English and is updated for the current financial year. It's $16.95, you buy direct from the author, and you get it in both PDF and EPUB.
This article is general information only and doesn't take account of your personal circumstances. Figures are current at time of writing and change each financial year. Consider seeking advice before acting.