Salary sacrifice is one of the most efficient tax strategies available to ordinary Australians, and one of the most under-used. The idea is simple: you ask your employer to direct some of your before-tax salary into your super fund instead of paying it to you. That money is then taxed at 15% inside super, rather than at your marginal income tax rate of up to 47%. The difference is your tax saving.
The strategy is not new — it has been part of the super system since compulsory super was introduced in 1992. But the numbers behind it have shifted. Since 1 July 2025, the Super Guarantee rate is 12%, the concessional contributions cap is $30,000, and the Stage 3 tax cuts have changed the marginal rates that define how much tax you save. This article walks through what the strategy actually gets you at each income level, where it stops being useful, and a few traps to watch for.
Every dollar you earn is taxed at your marginal rate. For a middle-income earner, that's 30% plus Medicare levy. For a high earner, it's 45% plus Medicare levy. If you reroute some of that income into super before it's taxed, it is instead taxed at a flat 15% when it lands in the fund (this is called contributions tax). The gap between your marginal rate and 15% is the saving.
Here's the 2025–26 breakdown for an Australian resident, using the post-Stage 3 brackets:
| Taxable income | Marginal rate | Plus Medicare | Tax saving per $1 |
|---|---|---|---|
| $0 – $18,200 | 0% | 0% | Usually negative |
| $18,201 – $45,000 | 16% | 2% | 3 cents |
| $45,001 – $135,000 | 30% | 2% | 17 cents |
| $135,001 – $190,000 | 37% | 2% | 24 cents |
| $190,001+ | 45% | 2% | 32 cents |
Tax rates are the 2025–26 resident rates set by the ATO. "Tax saving per $1" compares your total marginal rate (including Medicare levy) to the 15% contributions tax inside super. Division 293 tax applies an extra 15% on contributions for people earning over $250,000, reducing the saving for the highest earners — see caveat below.
You'll notice something important in that table. For someone earning under $45,000, salary sacrifice is essentially a break-even proposition — and for someone below the tax-free threshold, it actively costs you money, because you'd be paying 15% contributions tax on money that wouldn't have been taxed at all. Salary sacrifice is not a good fit for people near the bottom of the income distribution.
At the middle of the distribution — anyone earning roughly $45,000 to $190,000 — every dollar sacrificed saves between 17 and 24 cents in tax. That's a 17% to 24% immediate uplift before any compounding inside super. For higher earners above $190,000, each dollar saves 32 cents, although Division 293 pulls some of that back for income above $250,000 (see below).
Emma's employer contributes 12% SG, which is $9,000. Her concessional cap for 2025–26 is $30,000, so she has $21,000 of headroom. She decides to sacrifice $300 per fortnight ($7,800 per year) to make her total concessional contributions $16,800.
For a $204 per fortnight reduction in take-home pay, Emma adds $6,630 to her super each year. Over a 25-year working life at a 6% return, that $6,630 annual boost compounds to roughly $380,000 in her super balance at retirement (excluding inflation). The tax saving alone, compounded, is meaningful — and it costs her less than $200 per fortnight in her pocket today.
James's employer contributes $18,000 in SG. His concessional headroom is $12,000. He decides to sacrifice the full amount.
For every $1 that comes out of James's take-home pay, $1.39 lands in his super. That's the structural advantage of salary sacrifice for higher earners: it's effectively a 39% leverage ratio on each dollar.
Sarah's employer contributes $26,400 in SG. Her concessional headroom is just $3,600. She sacrifices that amount to hit the cap exactly. Division 293 does not apply because her income plus contributions is below $250,000.
Sarah's situation highlights the compulsory cap. Her employer's SG alone is eating most of her concessional space. She could potentially use carry-forward concessional contributions from unused cap space in previous years (if her total super balance is under $500,000), which would let her sacrifice much more in a single year.
If your income plus your concessional contributions exceeds $250,000 in a financial year, Division 293 tax kicks in. It applies an additional 15% tax on the portion of your concessional contributions above the $250,000 threshold, effectively bringing the total contributions tax to 30%.
Division 293 doesn't make salary sacrifice a bad strategy for high earners — even at 30%, the contributions tax is still well below a 47% marginal rate. But it does mean the tax saving per dollar is lower than the table suggests. Anyone close to the $250,000 threshold should model their specific numbers, because the tipping point can be counter-intuitive.
This is a mistake we see regularly. The ATO calculates your compulsory HELP/HECS repayment using a figure called Repayment Income, which is your taxable income plus reportable employer super contributions. Salary sacrifice amounts are reportable. So sacrificing doesn't lower your HECS repayment — the sacrificed amount is added back when the ATO calculates what you owe.
That doesn't make salary sacrifice a bad idea if you have a HECS debt, but the "tax saving" needs to be considered net of the HECS effect. Your marginal tax rate drops, but your HECS doesn't. For someone in the 30% tax bracket with HECS, the effective saving is still around 17 cents per dollar sacrificed — the HECS neutrality doesn't change the calculation, it just means HECS isn't a bonus benefit.
Use the Pay & Tax Calculator to model a sacrifice amount, and the Super Calculator to see how it compounds to retirement.
Pay & Tax Calculator → Super Calculator →All figures are drawn from primary Australian government sources and are current for the 2025–26 financial year. Tax brackets are the Stage 3 amended rates from the ATO. The concessional contributions cap of $30,000 and the Super Guarantee rate of 12% are set by the ATO and Treasury. Division 293 threshold of $250,000 is from the ATO. HELP/HECS repayment income rules are from the ATO's Higher Education Loan Program guidance.