Super contributions can do more than build your retirement savings. Used carefully, they may also help manage your taxable income, make use of unused contribution capacity and put surplus cash to work in a tax-effective environment.

The key is understanding whether a contribution is concessional or non-concessional before the money is paid into your fund. The category affects whether you can claim a deduction, how the contribution is taxed in the fund and which contribution cap applies. It is also important to remember that contribution caps are indexed and personal eligibility can vary, so the right approach is rarely a simple “top up super before EOFY” decision.

The core difference between concessional and non-concessional contributions

Concessional contributions are generally contributions that are included in the assessable income of the super fund. In practical terms, this commonly includes employer contributions, salary-sacrifice amounts and personal contributions for which you validly claim an income tax deduction.

Non-concessional contributions are generally made from money on which you have already paid tax. A personal contribution will usually be non-concessional where you do not claim a deduction for it. These contributions are not ordinarily taxed again when received by the fund, but they count towards a separate annual cap.

This distinction is particularly important for sole traders, company directors and professionals with variable income. Unlike an employee whose super may be largely handled through payroll, a business owner may have greater flexibility over when and how they contribute. That flexibility can create planning opportunities, but it can also increase the risk of exceeding a cap or claiming a deduction incorrectly.

At a high level:

  • Concessional contributions may reduce your personal taxable income where the relevant deduction rules are met.

  • Non-concessional contributions do not create a personal deduction, but can move after-tax savings into the superannuation system.

  • Both types of contributions are subject to rules about timing, fund acceptance and contribution caps.

  • Contributions made for you by an employer count towards your concessional cap, even where you have not personally arranged them.

  • A contribution’s classification can change depending on whether you lodge a valid notice of intent to claim a deduction.

The tax benefit of a concessional contribution is not simply the difference between your marginal tax rate and the fund tax rate. Your total income, other deductions, Medicare levy, reportable super contributions, tax offsets and possible additional super taxes can all affect the final outcome. It is worth reviewing the whole picture before making a large contribution.

How concessional contributions can support tax planning

Concessional contributions are often the first option considered when someone wants to increase super while potentially reducing taxable income. The usual categories are employer contributions, salary-sacrifice contributions and deductible personal contributions.

For most people, employer super guarantee contributions are the starting point. They count towards the same concessional cap as voluntary salary sacrifice and deductible personal contributions. This means you need to consider all concessional contributions made for you across every fund, not just the extra amount you intend to contribute before EOFY.

A salary-sacrifice arrangement is generally set up through your employer before the relevant income is earned. It can provide a regular, disciplined way to contribute more to super, particularly for employees with stable cash flow. However, it reduces take-home pay, so it should be considered alongside mortgage commitments, household expenses and other savings goals.

A deductible personal contribution is often more flexible. It can suit a sole trader, partner, contractor, investor or employee who receives a bonus or has a strong income year. It may also be useful where a business owner wants to wait until their profit position is clearer before deciding how much to contribute.

To claim a deduction for a personal contribution, you must meet the applicable eligibility requirements. You must also give your fund a valid notice of intent in the approved form and receive the fund’s written acknowledgement before claiming the deduction in your tax return. The notice deadline is generally the earlier of lodging your tax return for that income year or the end of the following income year.

This administration matters. If you make a contribution but do not complete the notice process correctly, the contribution may remain non-concessional. You may then lose the intended deduction and use part of your non-concessional cap instead.

A concessional contribution is generally taxed in a complying super fund at 15 per cent. That rate is one reason concessional contributions can be attractive for people paying tax at a higher marginal rate. However, the tax benefit should never be assumed. Higher-income individuals may be affected by Division 293 tax, and other circumstances can reduce or remove the expected advantage.

When non-concessional contributions may be the better choice

Non-concessional contributions are made from after-tax money. They do not provide an income tax deduction, but they can be valuable where tax deductions are not the main objective.

For example, you may have received an inheritance, accumulated cash in your personal name, sold an investment or simply want to add long-term savings to super. If you do not claim a deduction for a personal contribution, it will generally be treated as a non-concessional contribution, subject to the relevant rules and exclusions.

This can be useful for people who:

  • have already used their available concessional contribution capacity;

  • expect little or no immediate tax advantage from a deduction;

  • want to contribute after-tax savings to support retirement planning;

  • are balancing contributions between spouses;

  • may qualify for a government co-contribution; or

  • want to retain the tax-free component created by non-concessional contributions within their super interest.

Non-concessional contributions can also be relevant for people approaching retirement who have accumulated savings outside super. However, contribution eligibility and cap rules become more important as your total super balance grows.

Under the legislation, the annual non-concessional cap is linked to the concessional cap. If your total superannuation balance immediately before the start of the financial year is at or above the general transfer balance cap, your non-concessional cap can be nil.

There may also be an opportunity to use the bring-forward rules. Broadly, an eligible person who contributes more than their annual non-concessional cap may access future years’ cap amounts. The available amount and period depend on factors including age, prior bring-forward arrangements, total super balance and the space between that balance and the general transfer balance cap.

Because the bring-forward rules can affect more than one financial year, they should be checked before making a large contribution. A contribution that appears acceptable in one year may restrict your ability to contribute in later years.

Contribution caps: why checking the current year matters

Contribution caps are central to super planning, but they should never be treated as static. The concessional cap is indexed under the legislation, and the non-concessional cap is generally calculated by reference to the concessional cap.

For the 2025-26 financial year, the ATO published a general concessional contributions cap of $30,000 and a general non-concessional contributions cap of $120,000. These figures were subject to the relevant eligibility rules and individual circumstances. Because caps are indexed, they should be confirmed for the financial year in which the fund receives your contribution before you act.

For concessional contributions, you may be able to carry forward unused cap amounts from up to five earlier financial years. This is only available where your total superannuation balance immediately before the relevant financial year is below $500,000. The oldest unused amounts are applied first, and unused amounts eventually expire.

This may create a useful opportunity after an unusually profitable year, a bonus, the sale of a business asset or a period of reduced personal spending. It can also be helpful after several years in which you were focused on building a business and did not have the cash flow to make additional super contributions.

Before relying on carried-forward amounts, check:

  • employer contributions already made during the year;

  • salary-sacrifice amounts;

  • personal contributions you have already claimed or plan to claim as deductions;

  • contributions to other super funds;

  • your total super balance at the relevant date;

  • unused concessional cap amounts shown through ATO online services; and

  • whether your fund can receive the contribution before the intended deadline.

Timing is especially important near 30 June. A contribution generally needs to be received by the fund, not merely initiated from your bank account, to count in that financial year. Fund processing times, payment cut-offs and public holidays can all matter.

A practical scenario for a small business owner

Consider a sole trader who has had a stronger-than-expected financial year. After reviewing their bookkeeping and expected taxable income, they have surplus cash available and want to build retirement savings.

Their accountant first confirms the business profit, expected personal taxable income and any existing employer or personal super contributions. They then review the sole trader’s unused concessional cap amounts and total super balance.

If the sole trader has available concessional cap space and is eligible to claim a deduction, a deductible personal contribution may reduce taxable income while increasing retirement savings. If they have already used their concessional capacity, an after-tax non-concessional contribution may still be appropriate, provided their total super balance and any bring-forward arrangement allow it.

The right answer may also be to make no contribution at all. If contributing would leave the business short of working capital, create personal cash-flow pressure or result in an unintended cap issue, preserving flexibility may be more valuable than seeking a deduction.

That is why super planning should be integrated with business tax planning, rather than left until the final days of EOFY.

Avoiding the common mistakes

The most expensive super contribution mistakes are often administrative rather than strategic. A sound contribution can still produce an unexpected outcome if the paperwork, timing or cap calculation is wrong.

Common issues include:

  • assuming compulsory employer contributions do not count towards the concessional cap;

  • forgetting about salary sacrifice contributions made earlier in the year;

  • claiming a deduction before receiving a valid acknowledgement from the fund;

  • lodging a tax return before finalising the notice of intent;

  • rolling over or commencing an income stream before dealing with a deduction notice;

  • using the bring-forward rules without checking whether a previous arrangement is still active;

  • contributing late in June without allowing for the fund’s receipt and processing requirements; and

  • overlooking the impact of an excess concessional contribution on the non-concessional cap.

Where concessional contributions exceed the cap, the excess is included in your assessable income and a 15 per cent tax offset is available. You may also be able to request release of an amount from super. If excess concessional contributions remain in super, they can count towards the non-concessional cap.

Where non-concessional contributions exceed the applicable cap, the ATO may issue a determination. A person can generally elect to release the excess contribution and a portion of associated earnings, or choose not to release the amount and instead face excess non-concessional contributions tax.

Build retirement savings with a plan, not a last-minute contribution

Concessional contributions can be an effective way to combine retirement saving with tax planning. Non-concessional contributions can help move after-tax savings into super when a deduction is not available, not worthwhile or no longer needed.

The best option depends on your income, business structure, cash flow, existing super contributions, total super balance and longer-term retirement goals. A contribution made for the right reason, in the right amount and with the right documentation can be far more effective than a rushed EOFY payment.

This article is general information only and is not personal financial or tax advice. Before making a super contribution or claiming a deduction, speak with a registered tax agent or accountant, such as, about your specific circumstances.