Salary sacrificing into super is one of the simplest and most effective ways for working Australians to build their retirement savings while reducing their tax bill. The idea is straightforward: you agree with your employer to divert part of your pre-tax salary straight into your super fund, where it is taxed far more lightly than if it landed in your bank account.
Try it: the Salary Sacrifice Super Calculator shows how a sacrifice amount changes your take-home pay, your tax, and how much extra reaches your super.
This guide explains how salary sacrifice works, why the tax saving arises, how it fits within your contribution caps, and who benefits most. It builds on our overview of how superannuation works in Australia, so start there if you are new to super.
What Salary Sacrifice Actually Is
Salary sacrifice is an arrangement where you give up part of your future salary in exchange for your employer paying that amount into your super instead. Because the money never becomes salary in your hands, it is not taxed at your normal marginal income tax rate. Instead, it enters your fund as a concessional contribution and is generally taxed at just 15%.
The arrangement must be set up before you earn the income — you cannot retrospectively sacrifice pay you have already received. You agree the amount or percentage with your employer, who then redirects it each pay cycle. From 1 July 2026, employers must pay super on every payday under the Payday Super rules, so your sacrificed amounts should flow into your fund promptly.
Why the Tax Saving Arises
The benefit comes entirely from the gap between your marginal tax rate and the 15% contributions tax.
If you earn enough to sit in a marginal tax bracket well above 15% (as most full-time workers do), every dollar you salary sacrifice is taxed at 15% inside super rather than at your higher marginal rate as take-home pay. The higher your income, the bigger the gap — and the bigger the saving.
There is an important exception at the top end. Very high earners may pay an extra 15% on some concessional contributions under Division 293 tax, lifting the effective rate on those contributions to 30%. Even then, that is usually still below the top marginal rate, so salary sacrifice can remain worthwhile — but it is worth checking.
Worked Example
Consider Sam, who earns $100,000 a year and decides to salary sacrifice $10,000 into super.
| Without sacrifice | With $10,000 sacrifice | |
|---|---|---|
| Taxable salary | $100,000 | $90,000 |
| Tax on the $10,000 as salary | roughly $3,000+ (marginal rate) | — |
| Contributions tax on $10,000 in super | — | $1,500 (15%) |
| Amount landing in super | — | $8,500 |
Instead of the $10,000 being taxed at Sam’s marginal rate and shrinking in take-home pay, $8,500 lands in super working towards retirement. The exact saving depends on Sam’s marginal rate and the tax rates and thresholds applying in the year, but the direction is always the same: more of the money ends up invested for the future rather than paid in tax.
It Counts Towards Your Concessional Cap
Salary sacrifice contributions are concessional contributions, so they share the same annual cap as your compulsory employer Super Guarantee and any personal deductible contributions. For 2026–27 that cap is $32,500 — see our full guide to the super contribution caps.
This is the number-one thing to get right. Because your employer’s 12% SG already eats into the cap, you have less headroom than the full $32,500. On a $100,000 salary, SG alone is around $12,000, leaving roughly $20,500 for salary sacrifice before you hit the cap. Go over, and the excess is added back to your taxable income and taxed at your marginal rate — undoing the benefit.
Using Carry-Forward
If you have not used your full concessional cap in recent years, the carry-forward rule may let you contribute more than $32,500 in a single year, provided your total super balance was under $500,000 at the previous 30 June. This is handy in a high-income year or one where you want to offset a capital gain.
Salary Sacrifice vs Personal Deductible Contributions
There are two ways to get pre-tax money into super: salary sacrifice through your employer, or making a personal contribution and claiming a tax deduction for it. Both are concessional and share the same cap. Salary sacrifice is automatic and spread across the year; personal deductible contributions give you flexibility to decide the amount after the fact (for instance, once you know your income). Many people use whichever suits their cash flow, and some combine the two.
Who Benefits Most
- Middle and higher-income earners, where the gap between the marginal rate and 15% is largest.
- People with spare cash flow who do not need the sacrificed income now.
- Those approaching retirement wanting to boost their balance in the final working years.
Lower-income earners should think twice: if your marginal rate is at or near 15%, salary sacrifice offers little tax advantage, and you may do better with an after-tax contribution that attracts the government co-contribution. Couples can also consider spouse contributions and splitting to balance two accounts.
Setting Up a Salary Sacrifice Arrangement
Getting started is usually straightforward:
- Decide the amount. Work out how much you can afford to divert from take-home pay, then check it against your remaining concessional cap after accounting for employer SG.
- Agree it with your employer in writing. The arrangement must be documented and in place before you earn the income it applies to. Most payroll systems handle it as a standing instruction.
- Confirm it doesn’t reduce your SG. Your employer must still calculate compulsory SG on your pre-sacrifice ordinary time earnings — salary sacrifice should add to your super, not replace part of your employer’s obligation.
- Review it each year. Pay rises, bonuses, and changes to the contribution caps all affect how much room you have.
Salary Sacrifice and Your Broader Finances
Because salary sacrifice lowers your taxable salary, it can have knock-on effects worth thinking about. A lower assessable income can, in some cases, improve eligibility for income-tested government support, but it can also reduce your borrowing capacity if you are applying for a home loan, since lenders assess your take-home pay. If a major purchase or loan application is on the horizon, factor this in before ramping up your sacrifice.
It also changes your cash flow. Money in super is preserved until you meet a condition of release, so only sacrifice what you genuinely will not need before retirement. For most people the sweet spot is contributing enough to capture the tax benefit without leaving themselves short day to day.
Common Pitfalls
- Breaching the cap. Always account for your SG when setting the sacrifice amount.
- Setting it up too late. The arrangement must be agreed before you earn the income.
- Ignoring take-home cash flow. Sacrificing more than you can spare can leave you short.
- Forgetting insurance and loans. A lower taxable salary can affect borrowing capacity and some income-based entitlements.
Used within the caps, salary sacrifice is a reliable way to lift your final balance — a key lever in working out how much super you need to retire.
This article is general information only and not financial or tax advice; consider your own circumstances and speak to a licensed adviser or the ATO before acting.