Superannuation Contribution Strategies for 2025–26: Caps, Carry-Forward Rules & Tax Savings

For most Australians, superannuation is the single largest tax-advantaged investment vehicle available. Earnings inside super are taxed at just 15% in accumulation phase — compared to marginal rates of up to 47% outside. Yet a staggering proportion of people contribute only the mandated employer guarantee, leaving substantial tax savings on the table every year.

The 2025–26 financial year brings updated contribution caps and new opportunities to accelerate retirement savings. This guide explains every type of contribution, the limits that apply, the strategies worth considering, and the traps that trip people up.

Part 1: Concessional Contributions

Concessional contributions (CCs) are made into your super before tax — or from after-tax money you then claim as a deduction. They include:

• Employer SG contributions — 11.5% of your ordinary time earnings in 2024–25, rising to 12% from 1 July 2025
• Salary sacrifice contributions — voluntary pre-tax contributions arranged with your employer
• Personal deductible contributions — after-tax contributions you claim as a tax deduction in your personal return

For 2025–26, the concessional cap is $30,000. This is the total of ALL concessional contributions from all sources — employer SG, salary sacrifice, and personal deductible. If you exceed this cap, the excess is included in your assessable income and taxed at your marginal rate (with a 15% offset for the tax already paid inside super).

Personal Deductible Contributions — The Self-Employed Advantage

If you're self-employed, a contractor, or have any non-employer income, you can make personal contributions from your own funds and claim them as a tax deduction. This is one of the most powerful but underutilised strategies available.

The process: make the contribution to your super fund, then lodge a Notice of Intent to Claim a Deduction (s290-180 form) with your fund before lodging your tax return or rolling over/starting a pension — whichever comes first. The fund then treats the contribution as concessional.

Part 2: Carry-Forward Concessional Contributions

This rule, introduced in 2019, allows you to carry forward unused concessional cap space for up to five rolling years — provided your Total Super Balance (TSB) was under $500,000 on 30 June of the prior year.

Unused cap amounts from 2019–20 onwards accumulate and can be used in a future year. This is particularly valuable if you:

• Had a period of low income, maternity/paternity leave, or career break
• Received a large bonus, sold a business asset, or had a high-income year
• Are approaching retirement and want to make a large lump-sum concessional contribution
• Have a spouse who has been out of the workforce

Part 3: Non-Concessional Contributions

Non-concessional contributions (NCCs) are made from after-tax money — no deduction is claimed. They don't attract tax when they go in, and the earnings on that money are taxed at the concessional 15% rate inside super. This makes super an excellent long-term investment shelter even for after-tax money.

The NCC cap for 2025–26 is $120,000 per year. However, eligibility depends on your Total Super Balance (TSB) on 30 June of the prior year:

The Bring-Forward Rule

If your TSB is under $360,000 on 30 June of the prior year and you make NCCs in excess of the annual cap, the bring-forward rule is automatically triggered — allowing you to contribute up to $360,000 across three financial years without penalty. This is commonly used after selling an investment property, receiving an inheritance, or receiving a large windfall.

Part 4: Downsizer Contributions

If you're aged 55 or older and you sell a home you (or your spouse) have owned for at least 10 years, you can each contribute up to $300,000 from the proceeds into super as a downsizer contribution. That's up to $600,000 per couple.

Crucially, downsizer contributions:

• Do not count against your non-concessional cap
• Are available even if your TSB is above $1.9 million
• Cannot be claimed as a tax deduction (they're after-tax)
• Must be made within 90 days of the sale settlement
• Can only be made once — you can't use this rule again on a future home sale

The 90-day window is strict and catches people out frequently. If you're selling your home, speak to your accountant before settlement — not after.

Part 5: Spouse Contributions & Tax Offset

If your spouse earns under $37,000 in 2025–26, you can make an after-tax contribution to their super fund and claim a tax offset of up to $540 (18% of contributions up to $3,000). The offset reduces proportionally as the spouse's income approaches $40,000.

Beyond the tax offset, there's a more strategic reason to contribute to a lower-earning spouse's super: equalising balances. If one partner has $800,000 and the other has $200,000, income in the higher balance is taxed more heavily once the Transfer Balance Cap ($1.9 million from 2023–24) is reached. Equalising balances maximises the amount both partners can transfer to tax-free pension phase at retirement.

Part 6: The Government Co-Contribution

If you earn under $58,445 (2024–25 threshold) and make a personal non-concessional contribution of at least $1,000, the government contributes up to $500 directly to your super. The co-contribution phases out as income approaches $73,445.

This is one of the only contributions that gives you an immediate 50% guaranteed return — $1,000 in, $500 added automatically. Many lower-income earners are unaware of it, and simply not claiming it each year adds up to a significant missed opportunity over a working life.

Part 7: Division 293 Tax — The High-Income Super Surcharge

The concessional 15% tax rate inside super is deliberately generous. To limit the benefit for very high earners, the government imposes an additional 15% Division 293 tax on concessional contributions if your income plus low-tax contributions exceeds $250,000.

Even at 30%, super remains far more tax-effective than receiving the same money as salary at 47% marginal rate. A high-income earner salary sacrificing $30,000 still saves roughly $5,100 in tax compared to receiving it as income.

Part 8: Contribution Splitting

You can split up to 85% of your concessional contributions in any year to your spouse's super fund. The split doesn't count as a contribution for the receiving spouse — it's simply a transfer between funds. This is particularly useful when one partner is older and closer to accessing their super (which happens at the partner's preservation age, currently 60), or to equalise balances over time.

Part 9: Low Income Super Tax Offset (LISTO)

For individuals earning under $37,000 (2024–25), the government automatically adds a Low Income Super Tax Offset of up to $500 to your super fund. This effectively ensures low-income earners don't pay more tax on their super contributions than they would on ordinary income. No application is needed — the ATO calculates and pays this automatically.

Key Strategies to Consider Before 30 June

Common Contribution Mistakes

• Exceeding the concessional cap — employer SG alone can eat much of the cap for higher-income earners who also salary sacrifice; always check the total before making additional contributions
• Forgetting the Notice of Intent — the most common reason personal deductible contributions are disallowed
• Missing the 90-day downsizer window — once it passes, the opportunity is gone permanently
• Assuming NCC are always available — if your TSB is above $1.9 million, you cannot make any non-concessional contributions
• Not checking the carry-forward balance — leaving unused cap space without realising it's available
• Contributing to a fund in pension phase — once an account-based pension has commenced, you generally can't contribute further to that specific pension balance