Carry-forward concessional contributions: using up to 5 years of unused super cap

For most Australians, superannuation contributions accumulate in a fairly steady pattern — employer Superannuation Guarantee payments plus whatever voluntary contributions the member can manage. What is less widely understood is that the annual concessional contribution cap is not strictly use-it-or-lose-it. For members with a Total Superannuation Balance under $500,000, unused concessional cap from the previous five years can be carried forward and used in a single year, enabling a substantially larger contribution than the standard annual limit permits. For pre-retirees in the right circumstances, this is one of the most powerful remaining contribution strategies available.

How do carry-forward concessional contributions work?

The concessional contribution cap for FY2025-26 is $30,000 per year. This covers all concessional contributions — employer SG, salary sacrifice, and personal deductible contributions. Where a member does not fully use the cap in a year, the unused amount rolls forward and can be accessed in a later year, subject to the five-year rolling window. Amounts unused in FY2020-21 must be used by FY2025-26 or they expire; amounts unused in FY2021-22 expire at the end of FY2026-27, and so on.

The gating condition is the Total Superannuation Balance at the preceding 30 June. If the member's TSB at 30 June 2024 was under $500,000, they can access any unused concessional cap from FY2020-21 through FY2024-25. If the TSB was $500,000 or above, carry-forward is unavailable — the standard annual cap applies.

In FY2025-26, a member whose TSB was under $500,000 at 30 June 2024 and who has not fully used the concessional cap in any of the preceding five years could potentially access up to $167,500 in total concessional contributions for the year: the $30,000 current-year cap plus up to $137,500 in carried-forward unused amounts from the prior five years (which ran at $27,500 per year). For most people, some employer SG will have been paid across those years — the available carry-forward amount in practice depends on what was actually used, and the member's own MyGov account shows the available figure directly.

Who benefits most from carry-forward concessional contributions?

The strategy is most valuable in specific circumstances. Pre-retirees with career breaks — time out of paid work for childcare, study, illness, or other reasons — commonly have substantial unused cap available, because their concessional contributions during those years may have been minimal or zero beyond any SG paid on part-time work. Self-employed people with variable income often have years where they could not make meaningful contributions; the carry-forward rule allows those years' unused cap to be deployed in a subsequent higher-income year. Anyone in their 50s or early 60s with a TSB still below $500,000 has a closing window to make meaningful contributions before retirement — and carry-forward extends the effective size of that window significantly.

High-income years are the optimal deployment timing. When income is elevated — from a bonus, a business sale, a redundancy payment, or a particularly strong year — making a large carry-forward concessional contribution in that year maximises the tax deduction and reduces the taxable income impact. The personal deductible contribution is deducted from assessable income at the marginal rate; the super fund pays 15% contributions tax on the amount inside the fund. For a member on the top marginal rate of 47%, that differential produces a meaningful tax saving even after the fund's 15% tax. Members with income plus concessional contributions exceeding $250,000 in total will have the excess portion subject to an additional Division 293 tax of 15%, increasing the effective tax inside super for that portion to 30% — still below the 47% top marginal rate, but narrowing the advantage.

What are the practical requirements for using carry-forward contributions?

For employer SG and salary sacrifice, the concessional contribution is made automatically and counts toward the cap. For a personal deductible contribution, the member makes the contribution to their super fund and then lodges a Notice of Intent to Claim a Deduction (under ITAA 1997 s.290-170) with the fund before lodging the personal income tax return. The fund must acknowledge the notice. Tracking the total for the year is the member's responsibility — employer SG, any salary sacrifice, and any personal deductible contribution must together stay within the total available cap (current year plus carry-forward). Exceeding the cap produces excess concessional contributions tax, which is assessed at the member's marginal rate less a 15% offset, with an option to have the excess released from the fund.

How does carry-forward coordinate with other contribution strategies?

Carry-forward concessional contributions can be combined with other contribution strategies. Non-concessional contributions are subject to their own separate cap and TSB thresholds and can be made alongside concessional contributions. Downsizer contributions — available from age 55 after a principal home sale meeting the eligibility requirements — are not subject to the TSB restriction and can be made regardless of whether the carry-forward threshold has been reached. Spousal contribution strategies, which aim to equalise TSBs across a couple, interact with carry-forward in that the receiving spouse can only access carry-forward if their own TSB is below $500,000. For couples where one partner has a substantially higher TSB, the lower-balance partner's carry-forward capacity may be the most accessible remaining avenue for combined super optimisation.