How salary sacrifice into super works in Australia
Salary sacrifice is one of the most effective legal tax minimisation strategies available to Australian employees. When you salary sacrifice into superannuation, you redirect part of your pre-tax salary directly into your super fund before income tax is calculated. The sacrificed amount is taxed at a flat 15% contributions tax rate inside the fund — rather than at your personal marginal tax rate of up to 47%.
The difference between your marginal rate and the 15% fund tax rate is your annual tax saving. On a $60,000 salary in the 32.5% bracket, every dollar sacrificed saves 17.5 cents in tax compared to receiving it as income. Over a year of sacrificing $12,000, that's a $2,100 annual tax saving — money that stays in your fund compounding rather than going to the ATO.
The concessional contributions cap — what counts toward it
The concessional contributions cap is $30,000 per person for FY2025–26. Every dollar of pre-tax money going into your super fund counts toward this cap, including your employer's compulsory Superannuation Guarantee contributions. This is the most commonly misunderstood aspect of salary sacrifice.
- Employer SG (11.5%): Mandatory contributions from your employer count first and reduce your headroom for voluntary sacrifice.
- Salary sacrifice: Your voluntary pre-tax contributions count toward the same cap.
- Personal deductible contributions: If you make after-tax contributions and claim a tax deduction, these also count toward the $30,000 cap.
On a $60,000 salary, employer SG of $6,900 leaves $23,100 of cap remaining for voluntary salary sacrifice. On a $261,000 salary, employer SG alone reaches $30,000 — leaving no voluntary headroom without risking excess contributions tax.
Division 293 — the high-income surcharge
If your income (including super contributions) exceeds $250,000, the ATO applies an additional 15% Division 293 tax on your concessional contributions. This brings the effective tax rate inside super to 30% for high earners.
Salary sacrifice still saves tax at this level — your marginal rate of 45% minus the 30% inside super still saves 15 cents per dollar — but the saving is smaller than for middle-income earners. Division 293 is assessed after you lodge your tax return and can be paid from the super fund itself or personally from your bank account.
The real take-home pay reduction — less than you think
A common misconception is that sacrificing $1,000 per month reduces take-home pay by $1,000. It doesn't. Because the sacrifice reduces your taxable income, you pay less income tax — so the actual reduction in your monthly pay packet is the sacrifice amount minus the tax you would have paid on it. At a 32.5% marginal rate, sacrificing $1,000/month reduces take-home by approximately $675/month. The other $325 was going to the ATO as income tax anyway.
Key implementation step: Salary sacrifice is an arrangement made with your employer before the salary is earned. You cannot sacrifice salary that has already been paid to you. You need to request the arrangement in writing before the relevant pay period starts. Your employer's payroll team will then direct the sacrificed amount to your nominated super fund each pay cycle.
Salary sacrifice into an SMSF
If you have a Self-Managed Super Fund, you can direct salary sacrifice contributions into it — provided your employer's payroll system supports it and the SMSF is a complying fund. The same concessional cap and tax rules apply. The advantage of directing contributions to an SMSF is that you control exactly how the money is invested once it arrives in the fund, rather than being subject to a retail fund's investment menu.
Your employer will need your SMSF's bank account details and its electronic service address (ESA) for SuperStream compliance. Most SMSF administrators can provide these details. The ATO requires all super contributions to be made via SuperStream, so both your employer's payroll system and your SMSF need to be compliant.
Carry-forward contributions — if you have unused cap from prior years
If your super balance is below $500,000, you can carry forward unused concessional contribution cap amounts from the previous five financial years and contribute more than the standard $30,000 cap in a single year. This is particularly powerful for people returning from career breaks, those who have had lower incomes in prior years, or anyone who simply hasn't maximised contributions previously.
The carry-forward cap can allow contributions of $100,000 or more in a single year — depending on how much unused cap has accumulated. This is a significant tax planning opportunity that is frequently overlooked.
Model salary sacrifice in AlphaIQ →
AlphaIQ's What-If engine lets you model salary sacrifice changes against your full financial picture — retirement projection, property equity, and tax position all update in real time.