Salary Sacrifice Super in Australia: The Numbers That Actually Matter (2026)
Author: Tepuy Solutions | Date: April 2026
Category: Superannuation, Retirement Planning
Every piece of personal finance content in Australia mentions salary sacrificing into super. Few of them actually show you the maths. This article does. We model the tax saving at each income bracket, the compounding effect over 10 to 30 years, and the conditions under which salary sacrifice stops being the best move.
What Is Salary Sacrifice into Super?
Salary sacrifice means asking your employer to redirect part of your pre-tax salary into your superannuation fund instead of paying it to you as take-home income. Those contributions are taxed at the concessional rate of 15% inside super — instead of your marginal income tax rate, which can be as high as 47% (including the Medicare levy).
These count as concessional contributions, which include your employer's mandatory Superannuation Guarantee (SG) payments. For 2025–26, the total concessional contributions cap is $30,000 per year.
The Tax Saving: Every Income Bracket
The core benefit is simple: the difference between what you'd pay in income tax and the 15% super tax. The table below shows the annual tax saving on a $10,000 salary sacrifice for each marginal rate bracket (2025–26 rates, including 2% Medicare levy).
| Taxable Income | Marginal Rate (incl. Medicare) | Super Tax Rate | Saving on $10,000 Sacrifice | Effective "Return" Year 1 |
|---|---|---|---|---|
| $18,201 – $45,000 | 21% | 15% | $600 | 6% |
| $45,001 – $120,000 | 34.5% | 15% | $1,950 | 19.5% |
| $120,001 – $135,000 | 39% | 15% | $2,400 | 24% |
| $135,001 – $190,000 | 41% | 15% + 1% Div 293 | $2,500 | 25% |
| Over $190,000 | 47% | 15% + 15% Div 293 | $1,700 | 17% |
Key observation: The sweet spot is the $45,001–$120,000 bracket — the marginal rate is 34.5% and Div 293 doesn't apply, giving a nearly 20% immediate "return" before any investment growth. High earners above $250,000 face Division 293 tax, which claws back half the benefit, reducing the advantage to a still-reasonable 17%.
For incomes below $45,000, the saving is smaller (only 6% on a $10,000 sacrifice) and the liquidity cost matters more — money locked in super until preservation age may not be worth more than accessible savings.
The Compounding Effect: $5,000/Year Over 20 and 30 Years
The tax saving is only part of the story. Because the money compounds inside super at 0% tax on earnings (once you move to pension phase), the long-run difference is much larger. The table below models an additional $5,000/year salary sacrifice on top of SG contributions, assuming a 7% annual return inside super and a 7% return on after-tax savings invested in a diversified ETF portfolio (with 15% tax drag on distributions).
| Income Bracket | After-Tax Saving (Annual) | Extra Super Balance at 20 yrs | Extra Super Balance at 30 yrs | Equivalent Outside Super at 30 yrs |
|---|---|---|---|---|
| $45k–$120k | $4,025 invested in super vs $3,275 after tax | +$43,000 | +$120,000 | $330,000 vs $245,000 |
| $120k–$135k | $4,800 vs $3,900 | +$51,000 | +$143,000 | $395,000 vs $276,000 |
| $135k–$190k | $5,000 vs $3,750 (Div 293 applies) | +$53,000 | +$149,000 | $410,000 vs $266,000 |
| Over $190k | $4,850 vs $3,300 (full Div 293) | +$51,000 | +$144,000 | $398,000 vs $234,000 |
At the median income bracket, salary sacrifice produces roughly $85,000 more in retirement wealth over 30 years on a modest $5,000/year sacrifice. This is not the super fund's investment performance — it is purely the tax arbitrage, compounded.
The Concessional Cap: How Much Room Do You Have?
Your employer's SG contributions eat into your $30,000 cap. At the SG rate of 11.5% (rising to 12% from July 2025), a worker on $100,000 has approximately $18,500 of cap space remaining for voluntary salary sacrifice:
- $100,000 × 11.5% = $11,500 employer SG contribution
- Cap remaining = $30,000 − $11,500 = $18,500
Exceeding the concessional cap is penalised. Excess concessional contributions are included in your assessable income and taxed at your marginal rate, with a 15% offset — essentially paying the difference you would have paid anyway, plus an interest charge. Monitor your contributions via MyGov / ATO online during the year if you're approaching the cap.
Carry-Forward Unused Cap (5-Year Rule)
If your total super balance is below $500,000 at 30 June of the prior year, you can carry forward unused concessional cap space from up to five previous financial years. This is highly valuable after a career break, parental leave, or a period of self-employment with lower contributions. For example:
- 2021–22 unused cap: $8,000
- 2022–23 unused cap: $10,000
- 2023–24 unused cap: $5,000
- 2024–25 unused cap: $6,000
- Total carry-forward available in 2025–26: $29,000 (in addition to the standard $30,000 cap)
This means a returning worker with a $500,000 balance could contribute up to $59,000 in concessional contributions in a single year — a significant tax event if the timing is right.
When Salary Sacrifice Doesn't Make Sense
There are three situations where redirecting money into super via salary sacrifice is not optimal:
- You're under 45 with high-interest debt. A credit card at 20%+ or a personal loan at 12% is a guaranteed return that beats any super tax saving. Pay that off first.
- You need liquidity in the next 10–15 years. Super is locked until preservation age (currently 60). If you're planning a house purchase, business investment, or major expense before then, diverting money into super removes your flexibility. The tax saving doesn't compensate for a forced 10% early access penalty and income tax if you were to access it outside normal conditions.
- You're under the tax-free threshold or on the low-income super tax offset (LISTO). Below $37,000, the government rebates the 15% contributions tax via LISTO, meaning the concessional rate advantage shrinks to near zero. The case for salary sacrifice at low incomes is much weaker.
Salary Sacrifice vs After-Tax (Non-Concessional) Contributions
Non-concessional contributions — money you put into super from after-tax income — don't attract the 15% entry tax. They're subject to a separate cap of $120,000/year (or $360,000 in a three-year bring-forward if under 75). These are useful for people who have already maxed their concessional cap or want to move a lump sum (inheritance, property sale proceeds) into super at low tax rates on earnings.
Salary sacrifice is almost always better than non-concessional contributions for employed workers who haven't hit the concessional cap, because it reduces your taxable income directly. Non-concessional contributions don't — they're funded from income that's already been taxed at your full marginal rate.
A Worked Example: Two Colleagues, Same Salary
Alex and Jordan both earn $90,000. Alex does nothing extra beyond mandatory super. Jordan salary sacrifices $800/month ($9,600/year).
- Jordan's annual tax saving: $9,600 × (34.5% − 15%) = $1,872/year
- Jordan's take-home cost to get $9,600 into super: only $7,728 in foregone take-home pay
- Over 25 years at 7% super growth: Jordan accumulates approximately $290,000 more in super than Alex from salary sacrifice alone, before any investment outperformance
- Jordan's required retirement capital drops: because the super balance is larger, fewer years of drawdown are needed at the same lifestyle target
That $290,000 gap is generated entirely by tax structure, not investment skill. Jordan didn't need a better fund, a riskier portfolio, or exceptional returns. The Australian tax system paid for most of it.
Practical Steps to Start Salary Sacrificing
- Check your existing concessional contributions. Log into MyGov → ATO → Super to see what's already been contributed this financial year.
- Calculate your cap space. Subtract year-to-date employer SG from $30,000. Consider carry-forward if your balance is under $500,000.
- Submit a salary sacrifice agreement to your employer. This is typically a short form. The contribution is made pre-tax directly from your payroll into your nominated fund.
- Nominate your super fund. Ensure the employer knows where to direct the contributions. Most employers accept any APRA-regulated fund.
- Review quarterly. If your pay rises mid-year, recalculate to avoid accidentally exceeding the cap.
The Retirement Model Impact
To understand how salary sacrifice flows through to your actual retirement outcome — not just the balance at retirement, but income sustainability, drawdown order, Age Pension interaction, and the probability of success — run the numbers in our retirement planner. You can model the effect of additional super contributions directly, compare super vs non-super assets, and see how the Age Pension means test interacts with your super balance at different drawdown rates.
Disclaimer
This article is general information only and does not constitute financial or tax advice. Contribution caps, tax rates, and government scheme eligibility change regularly. Verify current figures at ato.gov.au or consult a licensed financial adviser for personalised guidance.