The Fine Print Australia · PUBLISHED 26 JUN 2026 · VERIFIED 26 JUN 2026 · AU EDITION

Catch-Up Super Contributions: Use the 15% Tax Rule Before You Lose It 🇦🇺

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Around 1 in 3 Australian workers had taxable income above $60,000 in 2022–23, yet many in that group still miss the chance to use unused concessional super caps and claim a tax deduction later; the carry-forward rule only works if your total super balance was below $500,000 on the previous 30 June.

The number that matters

The central number is $500,000: that is the total superannuation balance threshold below which Australians can access carry-forward (catch-up) concessional contributions from unused caps in the prior five years.

How it quietly costs you

The first money leak is not using unused concessional caps in years when income is higher than usual, which means missing a tax deduction on contributions that would otherwise have been taxed at your marginal rate instead of 15% inside super. The mechanism is the ATO carry-forward rule: unused concessional cap amounts from the previous five years can be added to the current year’s concessional cap, but only if your total super balance was under $500,000 on the previous 30 June.

For 2025–26, the standard concessional cap is $30,000 a year, so someone who had unused cap space can contribute above that amount and potentially reduce tax on the extra contribution. By comparison, if they do nothing, that contribution space expires after five years and cannot be reclaimed.

The second, compounding trap

The second layer is waiting too long to use carry-forward amounts, which compounds the loss because the forgone contribution not only misses the immediate tax deduction but also loses years of investment earnings inside super. The catch-up amount can only look back five years, so every year of delay can push an unused cap tranche out of reach.

A practical example from the ATO rules: if a person had several years of unused concessional cap room, they may be able to make a much larger deductible contribution in one year, but only while their total super balance remains below $500,000 and only within the five-year window. If they miss that window, the long-run cost is both the lost deduction and the lost compounding on the amount that could have been invested earlier.

What this looks like in practice

Megan, 44, is a Brisbane-based project manager earning $92,000 a year, with $310,000 in super and about 18 years to retirement, in an accumulation super account. She has had a few lower-income years and has not checked her unused concessional cap amounts in ATO Online.

• She discovers that the standard concessional cap is $30,000 for 2025–26, but she may be able to contribute above that using unused caps from the prior five years if her total super balance was under $500,000 on the previous 30 June.
• She discovers that concessional contributions are taxed at 15% in super rather than at her marginal tax rate, so a catch-up contribution can be materially more tax-effective than taking the same money as salary.
• She discovers her exact carry-forward amounts and prior-year balance in ATO Online via myGov, which the ATO says is where Australians can see their unused cap amounts and total super balance for the previous 30 June.

The full cost of doing nothing

For Megan, the combined upside of fixing both problems is the value of making full use of unused concessional caps sooner rather than later: the immediate tax savings from the deduction plus the extra years of investment earnings on the contributed amount. Using the ATO’s five-year carry-forward framework, the modelling basis is an eligible balance under $500,000, unused cap amounts from up to five years, and the difference between contributing now versus leaving the money outside super until later.

What to do about it

• Check your carry-forward balance in ATO Online via myGov and find the Super section showing unused concessional cap amounts and your total super balance at the previous 30 June.

• Log in to myGov and open ATO Online.

• Go to the Super tab and inspect carry-forward concessional amounts.

• Confirm whether your previous 30 June total super balance was under $500,000.

• Good looks like: a visible unused cap amount and an eligible balance under $500,000.

• Compare your fund’s concessional cap use against the current $30,000 annual cap and estimate how much unused cap is available.

• Find your year-to-date concessional contributions.

• Subtract them from the current year cap.

• Add eligible unused caps from prior years if the ATO shows them.

• Good looks like: a plan to contribute up to the cap you can actually use without penalty.

• Decide whether to make a deductible contribution before year-end if you have room under the carry-forward rules.

• Check your cash flow and tax position.

• Confirm the amount with your fund or payroll provider.

• Make the contribution and keep records for your deduction claim.

• Good looks like: a contribution that uses available cap space while staying within eligibility rules.

A myth worth clearing up

Myth: Carry-forward contributions are only for very wealthy Australians or people near retirement. Fact: The rule applies to any eligible person whose total super balance was below $500,000 on the previous 30 June, and the ATO says unused concessional cap amounts can be carried forward for five years.

Sources

• https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-contributions

Researched 2026-06-26.

Corrections & disclosure: an AI-assisted, human-reviewed guide. Every figure is dated and sourced above. Spot something out of date or wrong? Tell us and we’ll correct it — corrections are noted here and in the video description.