Catch-Up Super Contributions: Using Unused Cap

01 What carry-forward is

Carry-forward — often called catch-up — concessional contributions let you use unused concessional cap from the previous five financial years on top of the current year's $30,000 cap. Unused amounts have been tracked from 2018-19 onward and expire after five years, oldest first.

The mechanism is simply a bank. Every year you contribute less than the cap, the shortfall is credited; every year you contribute more than the cap, the excess draws that credit down. Someone who has contributed only employer Super Guarantee for five years on a modest salary can easily have $60,000 or more banked, and all of it is deductible at the concessional 15% rate rather than their marginal rate.

What makes it different from an ordinary contribution is timing rather than amount. The cap normally forces a large deduction to be spread across years; carry-forward lets you take it in the single year where it is worth most. That is the whole strategy — the rest is knowing which year that is.

Carry-forward is usually described as a five-year rolling allowance, and that framing hides the part that costs people money. Unused amounts expire oldest-first after five years whether or not you noticed them, so a balance built up quietly since 2018-19 is already losing its earliest year — and nothing tells you it has gone.

Source: ATO — Concessional contributions cap

02 The $500,000 balance test

There is one gate: your total super balance must have been under $500,000 at the previous 30 June. If it was, you can use any accumulated unused cap this year; if it was over, carry-forward switches off for the year, though your ordinary $30,000 cap still applies in full.

Two features of that test are worth planning around. It is measured on one date, so a balance that crosses $500,000 during the year does not block you until the following 30 June — which means the year you cross is often the last year the strategy is available. And it is measured on your total super balance across every fund, not the balance of the fund you are contributing to, so consolidating accounts does not change it.

Because eligibility is re-tested annually, people move in and out of it. A balance growing at 8% passes $500,000 from around $463,000 in a single year, so if you are close, the banked cap you have been saving for later may have one year left rather than five.

The $500,000 balance test surprises people twice. It is measured at the previous 30 June, so the position for a whole year was fixed by a date that has already passed and cannot be influenced now. And it is a cliff rather than a taper — at $500,001 the entire carry-forward facility switches off, which means banked cap that someone has been deliberately saving for a future high-income year frequently expires unused.

Source: ATO — Concessional contributions cap

03 Worked example: a spike year

The strategy shines when income jumps — a bonus, the sale of an asset that triggers a capital gain, or returning to full-time work after a break. A large deductible contribution made with carry-forward room offsets that high-marginal-rate income at 15% instead.

Put your numbers in to see the deductible room available and the tax it would save. The room is the part people get wrong: it is the current year's $30,000 cap, less the Super Guarantee your employer will pay this year, plus whatever unused cap has accumulated since 2018-19.

If your income is steady rather than spiky, ordinary salary sacrifice does the same job with less planning — carry-forward exists for the years that do not fit that pattern.

On the defaults above, the worked example shows: Using $38,325 of deductible room saves $9,198 in tax this year, taxed at 15% in super instead of 39%.

04 Pairing it with a capital gain

The most powerful use of carry-forward is in the same financial year you trigger a large capital gain — selling an investment property, a parcel of shares, or a business asset. The gain is added to your taxable income and taxed at your marginal rate; a large deductible contribution using banked cap offsets that income directly, and is taxed at 15% inside super instead.

On a $100,000 gain for someone who would otherwise pay 39%, using $50,000 of banked cap moves that $50,000 from a 39% rate to a 15% one — around $12,000 saved in a single transaction, with the money still yours, merely preserved.

Two constraints decide whether it is available. The contribution must be made in the same financial year as the gain, so it is planned before 30 June and not discovered at tax time in October. And the $500,000 balance test is measured at the previous 30 June, before the sale — which is why selling a large asset often does not disqualify you in the year you sell it, but reliably does in the year after. If you are going to use this, the sale year is usually the only year it works.

Source: ATO — Capital gains tax

05 Who it suits

Carry-forward suits people with interrupted or uneven income: parents returning from leave, anyone who took time off, the self-employed with variable earnings, and anyone facing a one-off capital gain. It does nothing for someone who consistently maxes their cap, because no unused room ever accumulates.

Check the number before you rely on it. Your available unused cap is shown in ATO online services through myGov, under Super, and it is the only authoritative figure — reconstructing it from payslips misses reportable employer contributions and any personal deductible contributions you claimed. Look before 30 June, not at tax time, because the contribution has to be received by your fund within the financial year to count.

Two failure modes to avoid. The oldest unused year drops off after five years whether you use it or not, so a large bank is not permanent. And if you plan to claim a deduction for a personal contribution, you must lodge a notice of intent with your fund and receive their acknowledgement before you lodge your tax return — miss that and the contribution stands but the deduction does not.

Source: ATO — Concessional contributions cap