Salary sacrifice is one of the most effective legal ways to reduce your income tax in Australia — and one of the most misunderstood. In 2025-26, with the superannuation guarantee at 12% and the concessional contributions cap at $30,000, getting salary sacrifice right can save you thousands of dollars a year. Getting it wrong can mean breaching your cap or missing out on benefits you assumed you had.
This guide explains exactly how salary sacrifice works in Australia, runs the numbers with a worked example, and shows you when it is genuinely worth doing — and when it is not.
What Is Salary Sacrifice?
Salary sacrifice is an arrangement between you and your employer where you agree to give up part of your future salary or wages in return for your employer providing benefits of a similar value. The most common form — and the one this guide focuses on — is sacrificing salary into your super fund.
The key word is future. A salary sacrifice arrangement must be agreed before you earn the pay. You cannot sacrifice salary you have already earned, and you cannot backdate an arrangement. If you want to start sacrificing, the agreement with your employer needs to be in place first, ideally in writing.
Here is why it saves tax: the sacrificed amount never becomes part of your taxable income. Instead of receiving $10,000 as salary (taxed at your marginal rate) and then contributing it to super yourself, your employer pays it directly into your super fund. Inside the fund it is taxed at 15% — the flat contributions tax on concessional contributions — instead of your personal marginal rate.
Because most workers pay a marginal rate above 15%, the difference is pure tax saved.
How Salary Sacrificing Into Super Works
The mechanics are straightforward:
- You agree with your employer to reduce your cash salary by a set amount each pay cycle (for example, $400 per fortnight).
- Your employer pays that amount into your super fund as an employer contribution, on top of the compulsory 12% super guarantee.
- The contribution is taxed at 15% inside your fund, rather than at your marginal income tax rate.
- The sacrificed amount counts toward your $30,000 concessional contributions cap for 2025-26 — the same cap that covers your employer’s 12% super guarantee.
The sacrificed amount also appears on your income statement as a reportable employer super contribution (RESC). This is important: while it reduces your taxable income, it is added back for several government income tests — including the Medicare levy surcharge, HECS repayment income, and Division 293 tax. We will come back to why that matters.
Worked Example: A $10,000 Sacrifice on a $100,000 Salary
Let us run the numbers for someone earning $100,000 in 2025-26 who salary-sacrifices $10,000 into super over the year:
| No sacrifice | $10,000 sacrifice | |
|---|---|---|
| Gross salary | $100,000 | $100,000 |
| Salary sacrificed | $0 | $10,000 |
| Taxable income | $100,000 | $90,000 |
| Income tax | $20,788 | $17,788 |
| Medicare levy (2%) | $2,000 | $1,800 |
| Cash in hand | $77,212 | $70,412 |
| Super received (gross) | $12,000 (SG) | $22,000 (SG + sacrifice) |
| Contributions tax in fund (15%) | $1,800 | $3,300 |
| Net added to super | $10,200 | $18,700 |
| Total: cash + super | $87,412 | $89,112 |
The result: sacrificing $10,000 cuts income tax by $3,000 (at the 30% marginal rate) while the contribution only costs $1,500 in fund tax — a net income-tax benefit of $1,500. You also save another $200 on the Medicare levy because your taxable income is lower. All up, you are $1,700 better off, and your super balance grows by an extra $8,500.
The higher your marginal tax rate, the bigger the saving. The table below shows the net benefit of a $10,000 sacrifice at each 2025-26 tax bracket:
| Marginal tax rate | Income tax saved | Contributions tax (15%) | Net benefit |
|---|---|---|---|
| 16% ($18,201–$45,000) | $1,600 | $1,500 | $100 |
| 30% ($45,001–$135,000) | $3,000 | $1,500 | $1,500 |
| 37% ($135,001–$190,000) | $3,700 | $1,500 | $2,200 |
| 45% ($190,001+) | $4,500 | $1,500 | $3,000 |
This is why salary sacrifice is mainly a strategy for middle and higher earners: at the 16% marginal rate the net benefit is barely $100 on a $10,000 sacrifice, while at the top rate it is $3,000.
The $30,000 Concessional Contributions Cap
The single most important number in salary sacrifice is the concessional contributions cap: $30,000 per year in 2025-26. Every concessional contribution counts toward it:
- Your employer’s compulsory 12% super guarantee
- Your salary-sacrificed amounts
- Any personal contributions you claim as a tax deduction
On a $100,000 salary, your employer’s 12% SG is $12,000 — leaving $18,000 of headroom for salary sacrifice. On a $200,000 salary, SG is $24,000, leaving only $6,000. And on a $250,000 salary, SG alone is $30,000, so there is no room left at all without carry-forward amounts.
If you exceed the cap, the excess is added back to your taxable income and taxed at your marginal rate, plus an interest charge. You can use carry-forward unused cap amounts from up to five previous years, but only if your total super balance was below $500,000 on 30 June of the previous year.
Before starting a salary sacrifice arrangement, add up your expected SG for the year and make sure your planned sacrifice fits inside the cap. A quick way to model it is with our salary sacrifice calculator, which shows your tax saving and cap headroom side by side.
When Is Salary Sacrifice Worth It?
Salary sacrifice is worth it when all of the following are broadly true:
- Your marginal tax rate is 30% or higher. Below that, the saving is small — at 16% you keep barely $100 of every $10,000 sacrificed.
- You do not need the cash soon. Super is preserved until you reach preservation age (60 for most people now) and meet a condition of release. Money you sacrifice is locked away.
- High-interest debt is under control. Paying off a 20% credit card or a 7% car loan usually beats the tax saving from super.
- You have an emergency buffer. Do not sacrifice yourself into a position where one unexpected bill forces you into debt.
- You have cap headroom. No point sacrificing if you will breach the $30,000 cap.
It is less worthwhile if you are on a low income (the tax arbitrage is tiny), if you are carrying expensive debt, if you might need the money for a house deposit in the next few years, or if you are already close to the concessional cap through SG alone.
One trap to know: if your income plus concessional contributions exceeds $250,000, Division 293 tax adds another 15% on the contributions — effectively doubling the fund tax to 30%. Salary sacrifice can still help at that level (your marginal rate is 47% including Medicare levy), but the benefit is smaller than it looks.
Salary Sacrifice vs Making a Personal Deductible Contribution
There is an alternative that achieves the same tax outcome: contribute to super from your after-tax pay, then claim a tax deduction when you lodge your return (a section 290-170 personal deductible contribution). The money is taxed at 15% in the fund, counts toward the same $30,000 cap, and reduces your taxable income the same way.
The differences are practical. Salary sacrifice spreads the benefit across the year through lower PAYG withholding, so your take-home pay adjusts immediately. Personal contributions give you flexibility — you can make a lump sum in June — but you must give your fund a valid notice of intent to claim before you lodge your tax return, and the deduction only lands at tax time.
For regular, set-and-forget contributions, salary sacrifice is usually simpler. For one-off amounts or bonus payments, personal deductible contributions are often easier.
Rules and Traps to Watch
- It must be prospective. The agreement has to cover pay you have not yet earned. You cannot sacrifice a bonus already paid or salary already worked.
- Your employer cannot short-change your SG. Since 1 January 2020, employers must calculate the 12% super guarantee on your pre-sacrifice salary — they cannot use your sacrificed amounts to satisfy their SG obligation.
- It does not reduce your HECS repayment. Reportable employer super contributions are added back to your repayment income, so salary sacrifice will not lower a compulsory HECS repayment. The same applies to the Medicare levy surcharge income test.
- Some entitlements are calculated on reduced salary. Overtime, bonuses, or leave payouts tied to your cash salary may shrink. Check your employment contract.
- Get it in writing. A written salary sacrifice agreement protects both sides and makes the arrangement clear to your payroll team.
Frequently Asked Questions
Does salary sacrifice reduce my HECS repayment?
No. Reportable employer super contributions are added back when the ATO calculates your HECS repayment income, so salary-sacrificing into super does not lower your compulsory repayment.
Does salary sacrifice affect my employer’s super guarantee payments?
It should not. Since 1 January 2020, your employer must pay the 12% super guarantee on your salary before the sacrificed amount is deducted. If your payslip suggests otherwise, raise it with payroll.
Can I salary sacrifice things other than super?
Yes. Common alternatives include cars through a novated lease, laptops and phones, and additional annual leave. Super is the most common choice because of the clear tax arbitrage, but a novated lease can suit some drivers.
What happens if I exceed the $30,000 concessional cap?
The excess is included in your assessable income and taxed at your marginal rate, less a 15% tax offset for the contributions tax already paid, plus an interest charge. You can elect to withdraw the excess from super to pay the bill.
Can I stop or change a salary sacrifice arrangement?
Yes — it is an agreement with your employer, not a life sentence. Most employers let you vary or stop the arrangement, usually with a pay cycle or two of notice. Check the terms of your written agreement.
Is salary sacrifice better than just investing the money myself?
It depends on your tax rate and goals. Inside super, contributions are taxed at 15% and earnings at a maximum of 15% — well below most marginal rates — but the money is locked away until preservation age. Money you invest yourself is accessible but taxed at your full marginal rate. Many people do both.
The Bottom Line
Salary sacrifice into super is one of the simplest high-impact tax strategies available to Australian employees in 2025-26 — provided your marginal rate is 30% or higher, you have room under the $30,000 concessional cap, and you can afford to lock the money away until retirement. On a $100,000 salary, sacrificing $10,000 leaves you $1,700 better off overall while adding $8,500 to your super.
Run your own numbers with our salary sacrifice calculator before you talk to your employer — it takes thirty seconds and shows exactly what a sacrifice is worth at your income.